Q_CreationDate stringlengths 23 23 | Title stringlengths 11 149 | Question stringlengths 25 6.53k | Answer stringlengths 15 5.1k | Score float64 -1 1.2 | Is_accepted bool 2
classes | N_answers int64 1 17 | Q_Id int64 0 6.76k |
|---|---|---|---|---|---|---|---|
2008-11-04 22:47:39.493 | How can I ask for root password but perform the action at a later time? | I have a python script that I would like to add a "Shutdown when done" feature to.
I know I can use gksudo (when the user clicks on "shutdown when done") to ask the user for root privileges but how can I use those privileges at a later time (when the script is actually finished).
I have thought about chmod u+s on the s... | Instead of chmod u+sing the shutdown command, allowing passwordless sudo access to that command would be better..
As for allowing shutdown at the end of the script, I suppose you could run the entire script with sudo, then drop privileges to the initial user at the start of the script? | 0.496174 | false | 3 | 40 |
2008-11-04 22:47:39.493 | How can I ask for root password but perform the action at a later time? | I have a python script that I would like to add a "Shutdown when done" feature to.
I know I can use gksudo (when the user clicks on "shutdown when done") to ask the user for root privileges but how can I use those privileges at a later time (when the script is actually finished).
I have thought about chmod u+s on the s... | Escalate priority, spawn (fork (2)) a separate process that will wait (2), and drop priority in the main process. | 0.135221 | false | 3 | 40 |
2008-11-04 22:47:39.493 | How can I ask for root password but perform the action at a later time? | I have a python script that I would like to add a "Shutdown when done" feature to.
I know I can use gksudo (when the user clicks on "shutdown when done") to ask the user for root privileges but how can I use those privileges at a later time (when the script is actually finished).
I have thought about chmod u+s on the s... | gksudo should have a timeout, I believe it's from the time you last executed a gksudo command.
So I think I'd just throw out a "gksudo echo meh" or something every minute. Should reset the timer and keep you active until you reboot. | 1.2 | true | 3 | 40 |
2008-11-05 21:50:04.180 | Using Python's smtplib with Tor | I'm conducting experiments regarding e-mail spam. One of these experiments require sending mail thru Tor. Since I'm using Python and smtplib for my experiments, I'm looking for a way to use the Tor proxy (or other method) to perform that mail sending.
Ideas how this can be done? | Because of abuse by spammers, many Tor egress nodes decline to emit port 25 (SMTP) traffic, so you may have problems. | 1.2 | true | 1 | 41 |
2008-11-06 09:39:20.723 | Multiple database support in django | From some forum I came to know that Multiple database support is added in Django at lower level, but the higher level apis are not added yet.
Can anyone please tell me how one can achieve multiple database connections in Django.
Does anyone have any idea by when Django will fully/officially support Multiple database co... | If you read a few of the many (many) threads on this subject in django-dev, you will see that what looks straightforward, isn't. If you pick a single use case, then it looks easy, but as soon as you start to generalize in any way you start to run into trouble.
To use the above-referenced thread as an example, when you ... | 0.121841 | false | 1 | 42 |
2008-11-07 11:35:00.583 | How should I stress test / load test a client server application? | I develop a client-server style, database based system and I need to devise a way to stress / load test the system. Customers inevitably want to know such things as:
• How many clients can a server support?
• How many concurrent searches can a server support?
• How much data can we store in the database?
• Etc.
Key to... | For performance you are looking at two things: latency (the responsiveness of the application) and throughput (how many ops per interval). For latency you need to have an acceptable benchmark. For throughput you need to have a minimum acceptable throughput.
These are you starting points. For telling a client how many x... | 0.386912 | false | 2 | 43 |
2008-11-07 11:35:00.583 | How should I stress test / load test a client server application? | I develop a client-server style, database based system and I need to devise a way to stress / load test the system. Customers inevitably want to know such things as:
• How many clients can a server support?
• How many concurrent searches can a server support?
• How much data can we store in the database?
• Etc.
Key to... | If you have the budget, LoadRunner would be perfect for this. | 0 | false | 2 | 43 |
2008-11-16 22:11:25.050 | How do I find userid by login (Python under *NIX) | I need to set my process to run under 'nobody', I've found os.setuid(), but how do I find uid if I have login?
I've found out that uids are in /etc/passwd, but maybe there is a more pythonic way than scanning /etc/passwd. Anybody? | Never directly scan /etc/passwd.
For instance, on a Linux system I administer, the user accounts are not on /etc/passwd, but on a LDAP server.
The correct way is to use getpwent/getgrent and related C functions (as in @TFKyle's answer), which will get the information on the correct way for each system (on Linux glibc, ... | 0.986614 | false | 1 | 44 |
2008-11-17 14:24:32.683 | What is a partial class? | What is and how can it be used in C#.
Can you use the same concept in Python/Perl? | Because python is a dynamic language you don't need a concept like partial class. In python is possible to extend object with functionality in runtime so it possible to break class declaration into different files | 0.050976 | false | 3 | 45 |
2008-11-17 14:24:32.683 | What is a partial class? | What is and how can it be used in C#.
Can you use the same concept in Python/Perl? | A Partial type is a type whose declaration is separated across multiple files. It makes sense to use them if you have a big class, which is hard to handle and read for a typical developer, to separate that class definition in separate files and to put in each file a logically separated section of code (for instance all... | 0 | false | 3 | 45 |
2008-11-17 14:24:32.683 | What is a partial class? | What is and how can it be used in C#.
Can you use the same concept in Python/Perl? | Python also has meta classes but that is more like a template class than a partial class. A good example of meta class usage is the Django ORM. All of your table models inherit from a base model class which also gets functionality included from a meta class. It is a pretty cool concept that enables an active record ... | 0 | false | 3 | 45 |
2008-11-17 18:56:12.727 | How do I remove a specific number of files using python (version 2.5)? | I would like to remove two files from a folder at the conclusion of my script. Do I need to create a function responsible for removing these two specific files? I would like to know in some detail how to use os.remove (if that is what I should use) properly. These two files will always be discarded at the conclusion of... | It is perfectly acceptable to have a 'cleanup()' function that you call at the end of your script, which will call 'os.remove()' on your files. | 0 | false | 1 | 46 |
2008-11-18 13:52:31.717 | Django Template Variables and Javascript | When I render a page using the Django template renderer, I can pass in a dictionary variable containing various values to manipulate them in the page using {{ myVar }}.
Is there a way to access the same variable in Javascript (perhaps using the DOM, I don't know how Django makes the variables accessible)? I want to be ... | For a dictionary, you're best of encoding to JSON first. You can use simplejson.dumps() or if you want to convert from a data model in App Engine, you could use encode() from the GQLEncoder library. | 0.201295 | false | 1 | 47 |
2008-11-18 16:22:39.447 | How can I get my python (version 2.5) script to run a jar file inside a folder instead of from command line? | I am familiar with using the os.system to run from the command line. However, I would like to be able to run a jar file from inside of a specific folder, eg. my 'test' folder. This is because my jar (located in my 'test' folder) requires a file inside of my 'test' folder. So, how would I write a function in my script t... | In general: Use os.chdir to change the directory of the parent process, then os.system to run the jar file. If you need to keep Python's working directory stable, you need to chdir back to original working directory - you need to record that with os.getcwd().
On Unix: Create a child process with os.fork explicitly. In ... | 0.201295 | false | 1 | 48 |
2008-11-18 18:39:05.350 | What are good ways to make my Python code run first time? | I'm getting quite a few errors in my code. Consequently, I would like to be able to minimize them at the outset or see as many errors as possible before code execution. Is this possible and if so, how can I do this? | Eric4 IDE also has a great built-in debugger. | 0 | false | 6 | 49 |
2008-11-18 18:39:05.350 | What are good ways to make my Python code run first time? | I'm getting quite a few errors in my code. Consequently, I would like to be able to minimize them at the outset or see as many errors as possible before code execution. Is this possible and if so, how can I do this? | The PyDev plugin for eclipse is my tool of choice. It recognizes simple syntax mistakes and indentation errors and underlines the error with a red line. It has a powerful debugger and even has a plugin called PyLint which warns you about dangerous code.
Edit:
It also has a user friendly stack trace on runtime errors, p... | 0.101688 | false | 6 | 49 |
2008-11-18 18:39:05.350 | What are good ways to make my Python code run first time? | I'm getting quite a few errors in my code. Consequently, I would like to be able to minimize them at the outset or see as many errors as possible before code execution. Is this possible and if so, how can I do this? | I am new to python, and have been trying several different debuggers. Here are the options I've come across so far:
Eclipse with Pydev - If you're already using eclipse, this is probably the way to go. The debugger works well, and is pretty featureful.
Komodo IDE - A light-weight python IDE. Basically a text editor + ... | 0.249709 | false | 6 | 49 |
2008-11-18 18:39:05.350 | What are good ways to make my Python code run first time? | I'm getting quite a few errors in my code. Consequently, I would like to be able to minimize them at the outset or see as many errors as possible before code execution. Is this possible and if so, how can I do this? | Using assert statement liberally. | 0.126864 | false | 6 | 49 |
2008-11-18 18:39:05.350 | What are good ways to make my Python code run first time? | I'm getting quite a few errors in my code. Consequently, I would like to be able to minimize them at the outset or see as many errors as possible before code execution. Is this possible and if so, how can I do this? | All the really cool stuff is easily demonstrated in the interactive interpreter. I think this might be the "gold standard" for good design:
Can you exercise your class interactively?
If you can do stuff interactively, then you can write unittests and doctests with confidence that it's testable, simple, reliable.
And, ... | 0.365009 | false | 6 | 49 |
2008-11-18 18:39:05.350 | What are good ways to make my Python code run first time? | I'm getting quite a few errors in my code. Consequently, I would like to be able to minimize them at the outset or see as many errors as possible before code execution. Is this possible and if so, how can I do this? | Test early and test often.
This doesn't necessarily mean to jump into the test driven design pool head first (though that's not such a bad idea). It just means, test your objects and methods as soon as you have something that works. Don't wait until you have a huge pile of code before doing testing.
Invest some time i... | 0.176697 | false | 6 | 49 |
2008-11-18 19:51:54.423 | Calling Java (or python or perl) from a PHP script | I've been trying to build a simple prototype application in Django, and am reaching the point of giving up, sadly, as it's just too complicated (I know it would be worth it in the long-run, but I really just don't have enough time available -- I need something up and running in a few days). So, I'm now thinking of goin... | "where I just can't figure out what model I need to produce the HTML form I want, which seems such a basic thing that I fear for my chances of doing anything more complex"
Common problem.
Root cause: Too much programming.
Solution. Do less programming. Seriously.
Define the Django model. Use the default admin page... | 1.2 | true | 1 | 50 |
2008-11-20 20:47:28.740 | With Python, how can I ensure that compression of a folder takes place within a particular folder? | I have been able to zip the contents of my folder. But I would like the zipped file to remain in the folder that was just compressed. For example, I've zipped a folder called test in my C: drive. But I would like my "test.zip" file to be contained in C:\test. How can I do this? Thanks in advance.
clarification of quest... | Whatever you pass as zip_file to your function will be the file that the ZipFile object will write to. So if you pass it a full path, then it will be put there. If you pass it just a filename, then it will be written to that filename under the current working path. It sounds like you just need to make sure that zip_fil... | 1.2 | true | 1 | 51 |
2008-11-24 22:21:17.943 | Running a function periodically in twisted protocol | I am looking for a way to periodically send some data over all clients connected to a TCP port. I am looking at twisted python and I am aware of reactor.callLater. But how do I use it to send some data to all connected clients periodically ? The data sending logic is in Protocol class and it is instantiated by the reac... | I'd imagine the easiest way to do that is to manage a list of clients in the protocol with connectionMade and connectionLost in the client and then use a LoopingCall to ask each client to send data.
That feels a little invasive, but I don't think you'd want to do it without the protocol having some control over the tra... | 0.545705 | false | 1 | 52 |
2008-11-26 06:20:40.703 | How do I skip processing the attachments of an email which is an attachment of a different email | using jython
I have a situation where emails come in with different attachments. Certain file types I process others I ignore and dont write to file.
I am caught in a rather nasty situation, because sometimes people send an email as an attachment, and that attached email has legal attachments.
What I want to do is ski... | Have you tried the get_payload( [i[, decode]]) method? Unlike walk it is not documented to recursively open attachments. | 0 | false | 1 | 53 |
2008-11-26 19:09:08.440 | Comparing XML in a unit test in Python | I have an object that can build itself from an XML string, and write itself out to an XML string. I'd like to write a unit test to test round tripping through XML, but I'm having trouble comparing the two XML versions. Whitespace and attribute order seem to be the issues. Any suggestions for how to do this? This is in ... | Why are you examining the XML data at all?
The way to test object serialization is to create an instance of the object, serialize it, deserialize it into a new object, and compare the two objects. When you make a change that breaks serialization or deserialization, this test will fail.
The only thing checking the XML ... | 0.121841 | false | 2 | 54 |
2008-11-26 19:09:08.440 | Comparing XML in a unit test in Python | I have an object that can build itself from an XML string, and write itself out to an XML string. I'd like to write a unit test to test round tripping through XML, but I'm having trouble comparing the two XML versions. Whitespace and attribute order seem to be the issues. Any suggestions for how to do this? This is in ... | The Java component dbUnit does a lot of XML comparisons, so you might find it useful to look at their approach (especially to find any gotchas that they may have already addressed). | 0 | false | 2 | 54 |
2008-12-05 12:02:54.363 | How do I submit a form given only the HTML source? | I would like to be able to submit a form in an HTML source (string). In other words I need at least the ability to generate POST parameters from a string containing HTML source of the form. This is needed in unit tests for a Django project. I would like a solution that possibly;
Uses only standard Python library and D... | It is simple... and hard at the same time.
Disclaimer: I don't know much about Python and nothing at all about Django... So I give general, language agnostic advices...
If one of the above advices doesn't work for you, you might want to do it manually:
Load the page with an HTML parser, list the forms.
If the method a... | 0.201295 | false | 1 | 55 |
2008-12-06 12:41:36.813 | Read file object as string in python | I'm using urllib2 to read in a page. I need to do a quick regex on the source and pull out a few variables but urllib2 presents as a file object rather than a string.
I'm new to python so I'm struggling to see how I use a file object to do this. Is there a quick way to convert this into a string? | You can use Python in interactive mode to search for solutions.
if f is your object, you can enter dir(f) to see all methods and attributes. There's one called read. Enter help(f.read) and it tells you that f.read() is the way to retrieve a string from an file object. | 1.2 | true | 1 | 56 |
2008-12-13 10:30:41.947 | Can you change a field label in the Django Admin application? | As the title suggests. I want to be able to change the label of a single field in the admin application. I'm aware of the Form.field attribute, but how do I get my Model or ModelAdmin to pass along that information? | Building on Javier's answer; if you need one label in forms (on the front-end) and another label on admin it is best to set internal (admin) one in the model and overwrite it on forms. Admin will of course use the label in the model field automatically. | 0.327599 | false | 1 | 57 |
2008-12-17 18:54:03.843 | Prevent ftplib from Downloading a File in Progress? | We have a ftp system setup to monitor/download from remote ftp servers that are not under our control. The script connects to the remote ftp, and grabs the file names of files on the server, we then check to see if its something that has already been downloaded. If it hasn't been downloaded then we download the file an... | You can't know when the OS copy is done. It could slow down or wait.
For absolute certainty, you really need two files.
The massive file.
And a tiny trigger file.
They can mess with the massive file all they want. But when they touch the trigger file, you're downloading both.
If you can't get a trigger, you have t... | 0 | false | 4 | 58 |
2008-12-17 18:54:03.843 | Prevent ftplib from Downloading a File in Progress? | We have a ftp system setup to monitor/download from remote ftp servers that are not under our control. The script connects to the remote ftp, and grabs the file names of files on the server, we then check to see if its something that has already been downloaded. If it hasn't been downloaded then we download the file an... | “Damn the torpedoes! Full speed ahead!”
Just download the file. If it is a large file then after the download completes wait as long as is reasonable for your scenario and continue the download from the point it stopped. Repeat until there is no more stuff to download. | 1.2 | true | 4 | 58 |
2008-12-17 18:54:03.843 | Prevent ftplib from Downloading a File in Progress? | We have a ftp system setup to monitor/download from remote ftp servers that are not under our control. The script connects to the remote ftp, and grabs the file names of files on the server, we then check to see if its something that has already been downloaded. If it hasn't been downloaded then we download the file an... | If you are dealing with multiple files, you could get the list of all the sizes at once, wait ten seconds, and see which are the same. Whichever are still the same should be safe to download. | 0 | false | 4 | 58 |
2008-12-17 18:54:03.843 | Prevent ftplib from Downloading a File in Progress? | We have a ftp system setup to monitor/download from remote ftp servers that are not under our control. The script connects to the remote ftp, and grabs the file names of files on the server, we then check to see if its something that has already been downloaded. If it hasn't been downloaded then we download the file an... | As you say you have 0 control over the servers and can't make your clients post trigger files as suggested by S. Lott, you must deal with the imperfect solution and risk incomplete file transmission, perhaps by waiting for a while and compare file sizes before and after.
You can try to rename as you suggested, but as y... | 0 | false | 4 | 58 |
2008-12-18 09:41:52.897 | Code not waiting for class initialization! | I have a block of code that basically intializes several classes, but they are placed in a sequential order, as later ones reference early ones.
For some reason the last one initializes before the first one...it seems to me there is some sort of threading going on. What I need to know is how can I stop it from doing th... | Python upto 3.0 has a global lock, so everything is running in a single thread and in sequence.
My guess is that some side effect initializes the last class from a different place than you expect. Throw an exception in __init__ of that last class to see where it gets called. | 1.2 | true | 2 | 59 |
2008-12-18 09:41:52.897 | Code not waiting for class initialization! | I have a block of code that basically intializes several classes, but they are placed in a sequential order, as later ones reference early ones.
For some reason the last one initializes before the first one...it seems to me there is some sort of threading going on. What I need to know is how can I stop it from doing th... | Spaces vs. Tabs issue...ugh. >.>
Well, atleast it works now. I admit that I kind of miss the braces from C instead of forced-indentation. It's quite handy as a prototyping language though. Maybe I'll grow to love it more when I get a better grasp of it. | 0 | false | 2 | 59 |
2008-12-18 21:23:50.017 | How to integrate the StringTemplate engine into the CherryPy web server | I love the StringTemplate engine, and I love the CherryPy web server, and I know that they can be integrated.
Who has done it? How?
EDIT: The TurboGears framework takes the CherryPy web server and bundles other related components such as a template engine, data access tools, JavaScript kit, etc. I am interested in M... | Rob,
There's reason behind people's selection of tools. StringTemplate is not terribly popular for Python, there are templating engines that are much better supported and with a much wider audience. If you don't like Kid, there's also Django's templating, Jinja, Cheetah and others. Perhaps you can find in one of them t... | 0 | false | 2 | 60 |
2008-12-18 21:23:50.017 | How to integrate the StringTemplate engine into the CherryPy web server | I love the StringTemplate engine, and I love the CherryPy web server, and I know that they can be integrated.
Who has done it? How?
EDIT: The TurboGears framework takes the CherryPy web server and bundles other related components such as a template engine, data access tools, JavaScript kit, etc. I am interested in M... | Based on the tutorials for both, it looks pretty straightforward:
import stringtemplate
import cherrypy
class HelloWorld(object):
def index(self):
hello = stringtemplate.StringTemplate("Hello, $name$")
hello["name"] = "World"
return str(hello)
index.exposed = True
cherrypy.quickstart(... | 0.673066 | false | 2 | 60 |
2008-12-18 21:52:22.050 | How much slower is a wxWidget written in Python versus C++? | I'm looking into writing a wxWidget that displays a graphical node network, and therefore does a lot of drawing operations. I know that using Python to do it is going to be slower, but I'd rather get it working and port it later when its functional. Ideally, if the performance hit isn't too great, I'd prefer to keep ... | For drawing, people have suggested PyGame. I like PyGame, its easy to work with and works well. Other choices would be Pyglet, or using PyOpenGL (you can most likely draw to a wx widget too, though I've never done it).
Personally, I'd do it in Python using whatever library I'm most familiar with (in my case, I'd use py... | 0.135221 | false | 1 | 61 |
2008-12-22 02:25:02.243 | Prototype based object orientation. The good, the bad and the ugly? | I come from classes object orientation languages and recently I have been learning those fancy dynamic languages (JavaScript, Python and Lua) and I want some tips about how to use OO in those languages. It would be useful to know the pitfalls and the shortcomings of such approach and the advantages compared to traditio... | Okay, first of all, the prototype model isn't all that different in reality; Smalltalk uses a similar sort of scheme; the class is an object with the classes methods.
Looked at from the class POV, a class is really the equivalence class of objects with the same data, and all the same methods; you can look at adding a m... | 0 | false | 2 | 62 |
2008-12-22 02:25:02.243 | Prototype based object orientation. The good, the bad and the ugly? | I come from classes object orientation languages and recently I have been learning those fancy dynamic languages (JavaScript, Python and Lua) and I want some tips about how to use OO in those languages. It would be useful to know the pitfalls and the shortcomings of such approach and the advantages compared to traditio... | Classical inheritance is inherently flawed in terms of flexibility, in that we are saying "this object is of this type and no other". Some languages introduce multiple inheritance to alleviate this, but multiple inheritance has its own pitfalls, and so the benefits of pure composition over inheritance (which, in a stat... | 0.081452 | false | 2 | 62 |
2008-12-22 22:37:08.520 | Using user input to find information in a Mysql database | I need to design a program using python that will ask the user for a barcode. Then, using this barcode, it will search a mysql to find its corresponding product.
I am a bit stuck on how to get started. Does anyone have any tips for me? | That is a very ambiguous question. What you want can be done in many ways depending on what you actually want to do.
How are your users going to enter the bar code? Are they going to use a bar code scanner? Are they entering the bar code numbers manually?
Is this going to run on a desktop/laptop computer or is it goin... | 0 | false | 3 | 63 |
2008-12-22 22:37:08.520 | Using user input to find information in a Mysql database | I need to design a program using python that will ask the user for a barcode. Then, using this barcode, it will search a mysql to find its corresponding product.
I am a bit stuck on how to get started. Does anyone have any tips for me? | A barcode is simply a graphical representation of a series of characters (alphanumeric)
So if you have a method for users to enter this code (a barcode scanner), then its just an issue of querying the mysql database for the character string. | 0.101688 | false | 3 | 63 |
2008-12-22 22:37:08.520 | Using user input to find information in a Mysql database | I need to design a program using python that will ask the user for a barcode. Then, using this barcode, it will search a mysql to find its corresponding product.
I am a bit stuck on how to get started. Does anyone have any tips for me? | To start with, treat the barcode input as plain old text.
It has been quite a while since I worked with barcode scanners, but I doubt they have changed that much, the older ones used to just piggyback on the keyboard input, so from a programming perspective, the net result was a stream of characters in the keyboard ... | 0 | false | 3 | 63 |
2008-12-23 22:37:51.123 | Interpreting Excel Currency Values | I am using python to read a currency value from excel. The returned from the range.Value method is a tuple that I don't know how to parse.
For example, the cell appears as $548,982, but in python the value is returned as (1, 1194857614).
How can I get the numerical amount from excel or how can I convert this tuple valu... | I tried this with Excel 2007 and VBA. It is giving correct value.
1) Try pasting this value in a new excel workbook
2) Press Alt + F11. Gets you to VBA Editor.
3) Press Ctrl + G. Gets you to immediate window.
4) In the immediate window, type ?cells("a1").Value
here "a1" is the cell where you have pasted the value.
I ... | 0 | false | 1 | 64 |
2009-01-01 00:55:16.753 | Python program to calculate harmonic series | Does anyone know how to write a program in Python that will calculate the addition of the harmonic series. i.e. 1 + 1/2 +1/3 +1/4... | The harmonic series diverges, i.e. its sum is infinity..
edit: Unless you want partial sums, but you weren't really clear about that. | 0.147343 | false | 2 | 65 |
2009-01-01 00:55:16.753 | Python program to calculate harmonic series | Does anyone know how to write a program in Python that will calculate the addition of the harmonic series. i.e. 1 + 1/2 +1/3 +1/4... | Just a footnote on the other answers that used floating point; starting with the largest divisor and iterating downward (toward the reciprocals with largest value) will put off accumulated round-off error as much as possible. | 0.183429 | false | 2 | 65 |
2009-01-03 19:37:41.127 | What versions of Python and wxPython correspond to each version of OSX? | I'd like to know what versions of Python and wxPython correspond to each version of OSX. I'm interested to know exactly how far back some of my apps will remain compatible on a mac before having to install newer versions of Python and wxPython. | Tiger shipped with Python 2.3.5 and wxPython 2.5.3, Leopard ships with python 2.5.1 and wxPython 2.8.4.
wxPython was not shipped with previous versions.
OSX Lion has 2.7.1 | 1.2 | true | 1 | 66 |
2009-01-08 05:45:02.847 | Using global variables in a function | How can I create or use a global variable in a function?
If I create a global variable in one function, how can I use that global variable in another function? Do I need to store the global variable in a local variable of the function which needs its access? | If you want to refer to a global variable in a function, you can use the global keyword to declare which variables are global. You don't have to use it in all cases (as someone here incorrectly claims) - if the name referenced in an expression cannot be found in local scope or scopes in the functions in which this func... | 0.994161 | false | 2 | 67 |
2009-01-08 05:45:02.847 | Using global variables in a function | How can I create or use a global variable in a function?
If I create a global variable in one function, how can I use that global variable in another function? Do I need to store the global variable in a local variable of the function which needs its access? | You're not actually storing the global in a local variable, just creating a local reference to the same object that your original global reference refers to. Remember that pretty much everything in Python is a name referring to an object, and nothing gets copied in usual operation.
If you didn't have to explicitly spec... | 0.415447 | false | 2 | 67 |
2009-01-08 20:17:05.613 | Drag button between panels in wxPython | Does anyone know of an example where it is shown how to drag a button from one panel to another in wxPython?
I have created a bitmap button in a panel, and I would like to be able to drag it to a different panel and drop I there.
I haven't found any examples using buttons, just text and files.
I am using the latest ve... | If you want to graphically represent the drag, one good way to do this is to create a borderless Frame that follows the mouse during a drag. You remove the button from your source Frame, temporarily put it in this "drag Frame", and then, when the user drops, add it to your destination Frame. | 1.2 | true | 1 | 68 |
2009-01-10 00:10:56.947 | Best way to poll a web service (eg, for a twitter app) | I need to poll a web service, in this case twitter's API, and I'm wondering what the conventional wisdom is on this topic. I'm not sure whether this is important, but I've always found feedback useful in the past.
A couple scenarios I've come up with:
The querying process starts every X seconds, eg a cron job runs a p... | You should have a page that is like a Ping or Heartbeat page. The you have another process that "tickles" or hits that page, usually you can do this in your Control Panel of your web host, or use a cron if you have a local access. Then this script can keep statistics of how often it has polled in a database or some dat... | 0 | false | 1 | 69 |
2009-01-10 23:57:46.473 | Programming Design Help - How to Structure a Sudoku Solver program? | I'm trying to create a sudoku solver program in Java (maybe Python).
I'm just wondering how I should go about structuring this...
Do I create a class and make each box a object of that class (9x9=81 objects)? If yes, how do I control all the objects - in other words, how do I make them all call a certain method in the ... | Don't over-engineer it. It's a 2-D array or maybe a Board class that represents a 2-D array at best. Have functions that calculate a given row/column and functions that let you access each square. Additional methods can be used validate that each sub-3x3 and row/column don't violate the required constraints. | 0.545705 | false | 5 | 70 |
2009-01-10 23:57:46.473 | Programming Design Help - How to Structure a Sudoku Solver program? | I'm trying to create a sudoku solver program in Java (maybe Python).
I'm just wondering how I should go about structuring this...
Do I create a class and make each box a object of that class (9x9=81 objects)? If yes, how do I control all the objects - in other words, how do I make them all call a certain method in the ... | Maybe a design that had a box per square, and another class to represent the puzzle itself that would have a collection of boxes, contain all the rules for box interactions, and control the overall game would be a good design. | 0 | false | 5 | 70 |
2009-01-10 23:57:46.473 | Programming Design Help - How to Structure a Sudoku Solver program? | I'm trying to create a sudoku solver program in Java (maybe Python).
I'm just wondering how I should go about structuring this...
Do I create a class and make each box a object of that class (9x9=81 objects)? If yes, how do I control all the objects - in other words, how do I make them all call a certain method in the ... | First, it looks like there are two kinds of cells.
Known calls; those with a fixed value, no choices.
Unknown cells; those with a set of candidate values that reduces down to a single final value.
Second, there are several groups of cells.
Horizontal rows and Vertical columns which must have one cell of each value. ... | 0 | false | 5 | 70 |
2009-01-10 23:57:46.473 | Programming Design Help - How to Structure a Sudoku Solver program? | I'm trying to create a sudoku solver program in Java (maybe Python).
I'm just wondering how I should go about structuring this...
Do I create a class and make each box a object of that class (9x9=81 objects)? If yes, how do I control all the objects - in other words, how do I make them all call a certain method in the ... | Well, I would use one class for the sudoku itself, with a 9 x 9 array and all the functionality to add numbers and detect errors in the pattern.
Another class will be used to solve the puzzle. | 0.101688 | false | 5 | 70 |
2009-01-10 23:57:46.473 | Programming Design Help - How to Structure a Sudoku Solver program? | I'm trying to create a sudoku solver program in Java (maybe Python).
I'm just wondering how I should go about structuring this...
Do I create a class and make each box a object of that class (9x9=81 objects)? If yes, how do I control all the objects - in other words, how do I make them all call a certain method in the ... | The simplest way to do it is to represent the board by a 2D 9x9 array. You'll want to have references to each row, column and 3x3 box as a separate object, so storing each cell in a String makes more sense (in Java) than using a primitive. With a String you can keep references to the same object in multiple container... | 0.050976 | false | 5 | 70 |
2009-01-12 04:05:35.690 | Installing certain packages using virtualenv | So, I want to start using virtualenv this year. I like the no-site-packages option, that is nice. However I was wondering how to install certain packages into each virtualenv. For example, lets say I want to install django into each virtualenv... is this possible, and if so, how? Does buildout address this?
Well i... | If you want django to be installed on EACH virtualenv, you might as well install it in the site-packages directory? Just a thought. | 0.16183 | false | 2 | 71 |
2009-01-12 04:05:35.690 | Installing certain packages using virtualenv | So, I want to start using virtualenv this year. I like the no-site-packages option, that is nice. However I was wondering how to install certain packages into each virtualenv. For example, lets say I want to install django into each virtualenv... is this possible, and if so, how? Does buildout address this?
Well i... | The other option (one I've used) is to easy_install Django after you've created the virtual environment. This is easily scripted. The penalty you pay is waiting for Django installation in each of your virtual environments.
I'm with Toby, though: Unless there's a compelling reason why you have to have a separate copy of... | 0 | false | 2 | 71 |
2009-01-12 18:38:15.180 | Python: import the containing package | In a module residing inside a package, i have the need to use a function defined within the __init__.py of that package. how can i import the package within the module that resides within the package, so i can use that function?
Importing __init__ inside the module will not import the package, but instead a module name... | In Django, the file manage.py has from django.core.management import execute_manager, but execute_manager is not a module. It is a function within the __init__.py module of the management directory. | 0.081452 | false | 3 | 72 |
2009-01-12 18:38:15.180 | Python: import the containing package | In a module residing inside a package, i have the need to use a function defined within the __init__.py of that package. how can i import the package within the module that resides within the package, so i can use that function?
Importing __init__ inside the module will not import the package, but instead a module name... | If the package is named testmod and your init file is therefore testmod/__init__.py and your module within the package is submod.py then from within submod.py file, you should just be able to say import testmod and use whatever you want that's defined in testmod. | 0.386912 | false | 3 | 72 |
2009-01-12 18:38:15.180 | Python: import the containing package | In a module residing inside a package, i have the need to use a function defined within the __init__.py of that package. how can i import the package within the module that resides within the package, so i can use that function?
Importing __init__ inside the module will not import the package, but instead a module name... | This doesn't exactly answer your question, but I'm going to suggest that you move the function outside of the __init__.py file, and into another module inside that package. You can then easily import that function into your other module. If you want, you can have an import statement in the __init__.py file that will im... | 0.999798 | false | 3 | 72 |
2009-01-12 21:11:44.310 | How to implement a python REPL that nicely handles asynchronous output? | I have a Python-based app that can accept a few commands in a simple read-eval-print-loop. I'm using raw_input('> ') to get the input. On Unix-based systems, I also import readline to make things behave a little better. All this is working fine.
The problem is that there are asynchronous events coming in, and I'd like ... | I think you have 2 basic options:
Synchronize your output (i.e. block until it comes back)
Separate your input and your (asyncronous) output, perhaps in two separate columns. | -0.067922 | false | 1 | 73 |
2009-01-13 16:21:17.920 | PIL vs RMagick/ruby-gd | For my next project I plan to create images with text and graphics. I'm comfortable with ruby, but interested in learning python. I figured this may be a good time because PIL looks like a great library to use. However, I don't know how it compares to what ruby has to offer (e.g. RMagick and ruby-gd). From what I c... | PIL is a good library, use it. ImageMagic (what RMagick wraps) is a very heavy library that should be avoided if possible. Its good for doing local processing of images, say, a batch photo editor, but way too processor inefficient for common image manipulation tasks for web.
EDIT: In response to the question, PIL sup... | 0.740859 | false | 1 | 74 |
2009-01-14 20:17:06.353 | How are debug consoles implemented in Python? | I've seen a couple of Python IDE's (e.g. PyDev Extensions, WingIDE) that provide a debug console - an interactive terminal that runs in the context of the method where the breakpoint is. This lets you print members, call other methods and see the results, and redefine methods to try to fix bugs. Cool.
Can anyone tell m... | You could try looking at the python debugger pdb. It's like gdb in how you use it, but implemented in pure python. Have a look for pdb.py in your python install directory. | 0.454054 | false | 1 | 75 |
2009-01-14 22:57:53.610 | How to make a wx Toolbar buttons larger? | I've got a wx.Toolbar and I'd like to make the buttons larger. I've searched and can't seem to find any concrete documentation on how to do this.
I'm also wondering how well this will translate across platforms; what will happen to the buttons and icons on OSX? | Doesn't the size of the toolbar adapts itself automatically to the size of the bitmap icons? I think if you want a bigger toolbar, you need bigger bitmaps. | 0.265586 | false | 1 | 76 |
2009-01-15 13:21:14.040 | How can I deploy a Perl/Python/Ruby script without installing an interpreter? | I want to write a piece of software which is essentially a regex data scrubber. I am going to take a contact list in CSV and remove all non-word characters and such from the person's name.
This project has Perl written all over it but my client base is largely non-technical and installing Perl on Windows would not be w... | "installing Perl on Windows would not be worth it for them" Really? It's that complex?
Python has a simple .MSI that neatly installs itself with no muss or fuss.
A simple application program is just a few .py files, so, I don't see a big pain factor there.
You know your customers best.
I find that the following isn't... | 0 | false | 1 | 77 |
2009-01-15 22:58:46.447 | How do I create a webpage with buttons that invoke various Python scripts on the system serving the webpage? | I'm a hobbyist (and fairly new) programmer who has written several useful (to me) scripts in python to handle various system automation tasks that involve copying, renaming, and downloading files amongst other sundry activities.
I'd like to create a web page served from one of my systems that would merely present a few... | When setting this up, please be careful to restrict access to the scripts that take some action on your web server. It is not sufficient to place them in a directory where you just don't publish the URL, because sooner or later somebody will find them.
At the very least, put these scripts in a location that is password... | 0 | false | 2 | 78 |
2009-01-15 22:58:46.447 | How do I create a webpage with buttons that invoke various Python scripts on the system serving the webpage? | I'm a hobbyist (and fairly new) programmer who has written several useful (to me) scripts in python to handle various system automation tasks that involve copying, renaming, and downloading files amongst other sundry activities.
I'd like to create a web page served from one of my systems that would merely present a few... | A simple cgi script (or set of scripts) is all you need to get started. The other answers have covered how to do this so I won't repeat it; instead, I will stress that using plain text will get you a long way. Just output the header (print("Content-type: text/plain\n") plus print adds its own newline to give you the ne... | 0.04532 | false | 2 | 78 |
2009-01-16 12:01:24.867 | How to check if a file can be created inside given directory on MS XP/Vista? | I have a code that creates file(s) in user-specified directory. User can point to a directory in which he can't create files, but he can rename it.
I have created directory for test purposes, let's call it C:\foo.
I have following permissions to C:\foo:
Traversing directory/Execute file
Removing subfolders and f... | I wouldn't waste time and LOCs on checking for permissions. Ultimate test of file creation in Windows is the creation itself. Other factors may come into play (such as existing files (or worse, folders) with the same name, disk space, background processes. These conditions can even change between the time you make the ... | 0.386912 | false | 2 | 79 |
2009-01-16 12:01:24.867 | How to check if a file can be created inside given directory on MS XP/Vista? | I have a code that creates file(s) in user-specified directory. User can point to a directory in which he can't create files, but he can rename it.
I have created directory for test purposes, let's call it C:\foo.
I have following permissions to C:\foo:
Traversing directory/Execute file
Removing subfolders and f... | I recently wrote a App to pass a set of test to obtain the ISV status from Microsoft and I also add that condition.
The way I understood it was that if the user is Least Priveledge then he won't have permission to write in the system folders. So I approached the problem the the way Ishmaeel described. I try to create t... | 1.2 | true | 2 | 79 |
2009-01-16 12:33:20.120 | Python Path | I am installing active python, django. I really dont know how to set the python path in vista environment system. first of all will it work in vista. | Remember that in addition to setting PYTHONPATH in your system environment, you'll also want to assign DJANGO_SETTINGS_MODULE. | 0 | false | 1 | 80 |
2009-01-20 03:43:14.223 | Python/Twisted - Sending to a specific socket object? | I have a "manager" process on a node, and several worker processes. The manager is the actual server who holds all of the connections to the clients. The manager accepts all incoming packets and puts them into a queue, and then the worker processes pull the packets out of the queue, process them, and generate a result.... | It sounds like you might need to keep a reference to the transport (or protocol) along with the bytes the just came in on that protocol in your 'event' object. That way responses that came in on a connection go out on the same connection.
If things don't need to be processed serially perhaps you should think about se... | 1.2 | true | 1 | 81 |
2009-01-20 16:37:53.927 | Python with Netbeans 6.5 | Can you give me some links or explain how to configure an existing python project onto Netbeans?
I'm trying it these days and it continues to crash also code navigation doesn't work well and I've problems with debugging. Surely these problems are related to my low eperience about python and I need support also in triv... | Python support is in beta, and as someone who works with NB for a past 2 years, I can say that even a release versions are buggy and sometimes crashes. Early Ruby support was also very shaky. | 0.386912 | false | 1 | 82 |
2009-01-21 07:14:19.397 | Python - Hits per minute implementation? | This seems like such a trivial problem, but I can't seem to pin how I want to do it. Basically, I want to be able to produce a figure from a socket server that at any time can give the number of packets received in the last minute. How would I do that?
I was thinking of maybe summing a dictionary that uses the current ... | When you say the last minute, do you mean the exact last seconds or the last full minute from x:00 to x:59? The latter will be easier to implement and would probably give accurate results. You have one prev variable holding the value of the hits for the previous minute. Then you have a current value that increments eve... | 1.2 | true | 3 | 83 |
2009-01-21 07:14:19.397 | Python - Hits per minute implementation? | This seems like such a trivial problem, but I can't seem to pin how I want to do it. Basically, I want to be able to produce a figure from a socket server that at any time can give the number of packets received in the last minute. How would I do that?
I was thinking of maybe summing a dictionary that uses the current ... | For what it's worth, your implementation above won't work if you don't receive a packet every second, as the next second entry won't necessarily be reset to 0.
Either way, afaik the "correct" way to do this, ala logs analysis, is to keep a limited record of all the queries you receive. So just chuck the query, time rec... | 0.135221 | false | 3 | 83 |
2009-01-21 07:14:19.397 | Python - Hits per minute implementation? | This seems like such a trivial problem, but I can't seem to pin how I want to do it. Basically, I want to be able to produce a figure from a socket server that at any time can give the number of packets received in the last minute. How would I do that?
I was thinking of maybe summing a dictionary that uses the current ... | A common pattern for solving this in other languages is to let the thing being measured simply increment an integer. Then you leave it to the listening client to determine intervals and frequencies.
So you basically do not let the socket server know about stuff like "minutes", because that's a feature the observer calc... | 0.386912 | false | 3 | 83 |
2009-01-21 19:40:34.663 | How can I return system information in Python? | Using Python, how can information such as CPU usage, memory usage (free, used, etc), process count, etc be returned in a generic manner so that the same code can be run on Linux, Windows, BSD, etc?
Alternatively, how could this information be returned on all the above systems with the code specific to that OS being run... | It looks like you want to get a lot more information than the standard Python library offers. If I were you, I would download the source code for 'ps' or 'top', or the Gnome/KDE version of the same, or any number of system monitoring/graphing programs which are more likely to have all the necessary Unix cross platform ... | 0.058243 | false | 1 | 84 |
2009-01-22 23:25:40.950 | Organising a GUI application | This is going to be a generic question.
I am struggling in designing a GUI application, esp. with dealing with interactions between different parts.
I don't know how I should deal with shared state. On one hand, shared state is bad, and things should be as explicit as possible. On the other hand, not having shared stat... | If you've looked at MVC you're probably moving in the right direction. MVC, MVP, Passive View, Supervising Controller. Those are all different ways, each with their own pros and cons, of accomplishing what you're after. I find that Passive View is the "ideal", but it causes you to introduce far too many widgets into... | 0.265586 | false | 2 | 85 |
2009-01-22 23:25:40.950 | Organising a GUI application | This is going to be a generic question.
I am struggling in designing a GUI application, esp. with dealing with interactions between different parts.
I don't know how I should deal with shared state. On one hand, shared state is bad, and things should be as explicit as possible. On the other hand, not having shared stat... | In MVC, the Model stuff is the shared state of the information.
The Control stuff is the shared state of the GUI control settings and responses to mouse-clicks and what-not.
Your scripting angle can
1) Update the Model objects. This is good. The Control can be "Observers" of the model objects and the View be updated... | 0.135221 | false | 2 | 85 |
2009-01-23 16:16:33.017 | When printing an image, what determines how large it will appear on a page? | Using Python's Imaging Library I want to create a PNG file.
I would like it if when printing this image, without any scaling, it would always print at a known and consistent 'size' on the printed page.
Is the resolution encoded in the image?
If so, how do I specify it?
And even if it is, does this have any relevance w... | Printers have various resolutions in which they print. If you select a print resolution of 200 DPI for instance (or if it's set as default in the printer driver), then a 200 pixel image should be one inch in size. | 0.081452 | false | 4 | 86 |
2009-01-23 16:16:33.017 | When printing an image, what determines how large it will appear on a page? | Using Python's Imaging Library I want to create a PNG file.
I would like it if when printing this image, without any scaling, it would always print at a known and consistent 'size' on the printed page.
Is the resolution encoded in the image?
If so, how do I specify it?
And even if it is, does this have any relevance w... | Much is going to depend on the software you're using to print. If you're placing the image in a Word document, it will scale according to the DPI, up to the width of your page. If you're putting it on a web page, the DPI will not matter at all. | 0 | false | 4 | 86 |
2009-01-23 16:16:33.017 | When printing an image, what determines how large it will appear on a page? | Using Python's Imaging Library I want to create a PNG file.
I would like it if when printing this image, without any scaling, it would always print at a known and consistent 'size' on the printed page.
Is the resolution encoded in the image?
If so, how do I specify it?
And even if it is, does this have any relevance w... | Both image print size and resolution are relevant to printing an image of a specific scale and quality. Bear in mind that if the image is then included with a desktop publishing workspace (Word, InDesign) or even a web page, the image is then subject to any specified resolution in the parent document -- this won't nece... | 0.081452 | false | 4 | 86 |
2009-01-23 16:16:33.017 | When printing an image, what determines how large it will appear on a page? | Using Python's Imaging Library I want to create a PNG file.
I would like it if when printing this image, without any scaling, it would always print at a known and consistent 'size' on the printed page.
Is the resolution encoded in the image?
If so, how do I specify it?
And even if it is, does this have any relevance w... | I found a very simple way to get dpi information into the png:
im.save('myfile.png',dpi=[600,600])
Unfortunately I did not find this documented anywhere and had to dig into the PIL source code. | 0.240117 | false | 4 | 86 |
2009-01-26 22:42:42.320 | Can a lambda function call itself recursively in Python? | A regular function can contain a call to itself in its definition, no problem. I can't figure out how to do it with a lambda function though for the simple reason that the lambda function has no name to refer back to. Is there a way to do it? How? | If you were truly masochistic, you might be able to do it using C extensions, but this exceeds the capability of a lambda (unnamed, anonymous) functon.
No. (for most values of no). | -0.081452 | false | 1 | 87 |
2009-01-28 13:39:54.740 | Inventory Control Across Multiple Servers .. Ideas? | We currently have an inventory management system that was built in-house. It works great, and we are constantly innovating it.
This past Fall, we began selling products directly on one of our websites via a Shopping Cart checkout.
Our inventory management system runs off a server in the office, while the three website... | I don't see the problem... You have an application running on one server that manages your database locally. There's no reason a remote server can't also talk to that database.
Of course, if you don't have a database and are instead using a homegrown app to act as some sort of faux-database, I recommend that you refact... | 0 | false | 3 | 88 |
2009-01-28 13:39:54.740 | Inventory Control Across Multiple Servers .. Ideas? | We currently have an inventory management system that was built in-house. It works great, and we are constantly innovating it.
This past Fall, we began selling products directly on one of our websites via a Shopping Cart checkout.
Our inventory management system runs off a server in the office, while the three website... | One possibility would be to expose a web service interface on your inventory management system that allows the transactions used by the web shopfront to be accessed remotely. With a reasonably secure VPN link or ssh tunnel type arrangement, the web shopfront could get stock levels, place orders or execute searches aga... | 1.2 | true | 3 | 88 |
2009-01-28 13:39:54.740 | Inventory Control Across Multiple Servers .. Ideas? | We currently have an inventory management system that was built in-house. It works great, and we are constantly innovating it.
This past Fall, we began selling products directly on one of our websites via a Shopping Cart checkout.
Our inventory management system runs off a server in the office, while the three website... | I'm not sure if there is any one really good solution for your problem. I think the way you are doing it now works fine, but if you don't agree then I don't know what to tell you. | 0 | false | 3 | 88 |
2009-01-29 18:05:22.420 | Reversing a regular expression in Python | I want to reverse a regular expression. I.e. given a regular expression, I want to produce any string that will match that regex.
I know how to do this from a theoretical computer science background using a finite state machine, but I just want to know if someone has already written a library to do this. :)
I'm using P... | Unless your regex is extremely simple (i.e. no stars or pluses), there will be infinitely many strings which match it. If your regex only involves concatenation and alternation, then you can expand each alternation into all of its possibilities, e.g. (foo|bar)(baz|quux) can be expanded into the list ['foobaz', 'fooquu... | 0.249709 | false | 1 | 89 |
2009-01-30 18:21:13.493 | What's a good way to keep track of class instance variables in Python? | I'm a C++ programmer just starting to learn Python. I'd like to know how you keep track of instance variables in large Python classes. I'm used to having a .h file that gives me a neat list (complete with comments) of all the class' members. But since Python allows you to add new instance variables on the fly, how d... | First of all: class attributes, or instance attributes? Or both? =)
Usually you just add instance attributes in __init__, and class attributes in the class definition, often before method definitions... which should probably cover 90% of use cases.
If code adds attributes on the fly, it probably (hopefully :-) has good... | 1.2 | true | 5 | 90 |
2009-01-30 18:21:13.493 | What's a good way to keep track of class instance variables in Python? | I'm a C++ programmer just starting to learn Python. I'd like to know how you keep track of instance variables in large Python classes. I'm used to having a .h file that gives me a neat list (complete with comments) of all the class' members. But since Python allows you to add new instance variables on the fly, how d... | The easiest is to use an IDE. PyDev is a plugin for eclipse.
I'm not a full on expert in all ways pythonic, but in general I define my class members right under the class definition in python, so if I add members, they're all relative.
My personal opinion is that class members should be declared in one section, for thi... | 0 | false | 5 | 90 |
2009-01-30 18:21:13.493 | What's a good way to keep track of class instance variables in Python? | I'm a C++ programmer just starting to learn Python. I'd like to know how you keep track of instance variables in large Python classes. I'm used to having a .h file that gives me a neat list (complete with comments) of all the class' members. But since Python allows you to add new instance variables on the fly, how d... | This is a common concern I hear from many programmers who come from a C, C++, or other statically typed language where variables are pre-declared. In fact it was one of the biggest concerns we heard when we were persuading programmers at our organization to abandon C for high-level programs and use Python instead.
In t... | 0.081452 | false | 5 | 90 |
2009-01-30 18:21:13.493 | What's a good way to keep track of class instance variables in Python? | I'm a C++ programmer just starting to learn Python. I'd like to know how you keep track of instance variables in large Python classes. I'm used to having a .h file that gives me a neat list (complete with comments) of all the class' members. But since Python allows you to add new instance variables on the fly, how d... | Instance variables should be initialized in the class's __init__() method. (In general)
If that's not possible. You can use __dict__ to get a dictionary of all instance variables of an object during runtime. If you really need to track this in documentation add a list of instance variables you are using into the docstr... | 0.16183 | false | 5 | 90 |
2009-01-30 18:21:13.493 | What's a good way to keep track of class instance variables in Python? | I'm a C++ programmer just starting to learn Python. I'd like to know how you keep track of instance variables in large Python classes. I'm used to having a .h file that gives me a neat list (complete with comments) of all the class' members. But since Python allows you to add new instance variables on the fly, how d... | I would say, the standard practice to avoid this is to not write classes where you can be 1000 lines away from anything!
Seriously, that's way too much for just about any useful class, especially in a language that is as expressive as Python. Using more of what the Standard Library offers and abstracting away code into... | 0.386912 | false | 5 | 90 |
2009-01-31 01:22:08.137 | How to make python gracefully fail? | I was just wondering how do you make python fail in a user defined way in all possible errors.
For example, I'm writing a program that processes a (large) list of items, and some of the items may not be in the format I defined. If python detects an error, it currently just spits out an ugly error message and stop the ... | all possible errors
The other answers pretty much cover how to make your program gracefully fail, but I'd like to mention one thing -- You don't want to gracefully fail all errors. If you hide all your errors, you won't be shown those which signify that the logic of the program is wrong - namely errors you want to see... | 0.16183 | false | 1 | 91 |
2009-02-01 03:37:44.480 | Can I log into a web application automatically using a users windows logon? | On the intranet at my part time job (not IT related) there are various web applications that we use that do not require logging in explicitly. We are required to login to Windows obviously, and that then authenticates us some how.
I'm wondering how this is done? Without worrying about security TOO much, how would I go ... | To the best of my knowledge the only browser that automatically passes your login credentials is Internet Explorer. To enable this feature select "Enable Integrated Windows Authentication" in the advanced Internet options dialog under the security section. This is usually enabled by default.
The web server will ha... | 0 | false | 1 | 92 |
2009-02-05 04:51:24.623 | Random name generator strategy - help me improve it | I have a small project I am doing in Python using web.py. It's a name generator, using 4 "parts" of a name (firstname, middlename, anothername, surname). Each part of the name is a collection of entites in a MySQL databse (name_part (id, part, type_id), and name_part_type (id, description)). Basic stuff, I guess.
My ge... | I agree with your intuition that using a stored procedure is the right way to go, but then, I almost always try to implement database stuff in the database.
In your proc, I would introduce some kind of logic like say, there's only a 30% chance that returning the result will actually increment the counter. Just to incre... | 0.201295 | false | 1 | 93 |
2009-02-05 21:19:20.087 | How to clear the interpreter console? | Like most Python developers, I typically keep a console window open with the Python interpreter running to test commands, dir() stuff, help() stuff, etc.
Like any console, after a while the visible backlog of past commands and prints gets to be cluttered, and sometimes confusing when re-running the same command several... | I am using Spyder (Python 2.7) and to clean the interpreter console I use either
%clear
that forces the command line to go to the top and I will not see the previous old commands.
or I click "option" on the Console environment and select "Restart kernel" that removes everything. | 0.013605 | false | 7 | 94 |
2009-02-05 21:19:20.087 | How to clear the interpreter console? | Like most Python developers, I typically keep a console window open with the Python interpreter running to test commands, dir() stuff, help() stuff, etc.
Like any console, after a while the visible backlog of past commands and prints gets to be cluttered, and sometimes confusing when re-running the same command several... | Quickest and easiest way without a doubt is Ctrl+L.
This is the same for OS X on the terminal. | 0.327599 | false | 7 | 94 |
2009-02-05 21:19:20.087 | How to clear the interpreter console? | Like most Python developers, I typically keep a console window open with the Python interpreter running to test commands, dir() stuff, help() stuff, etc.
Like any console, after a while the visible backlog of past commands and prints gets to be cluttered, and sometimes confusing when re-running the same command several... | If it is on mac, then a simple cmd + k should do the trick. | 0.027204 | false | 7 | 94 |
2009-02-05 21:19:20.087 | How to clear the interpreter console? | Like most Python developers, I typically keep a console window open with the Python interpreter running to test commands, dir() stuff, help() stuff, etc.
Like any console, after a while the visible backlog of past commands and prints gets to be cluttered, and sometimes confusing when re-running the same command several... | I found the simplest way is just to close the window and run a module/script to reopen the shell. | 0.013605 | false | 7 | 94 |
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