Python Client API Reference
Initialize MinIO Client object.
MinIO
from minio import Minio
from minio.error import ResponseError
minioClient = Minio(
'play.min.io',
access_key='Q3AM3UQ867SPQQA43P2F',
secret_key='zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG',
secure=True,
)
AWS S3
from minio import Minio
from minio.error import ResponseError
s3Client = Minio(
's3.amazonaws.com',
access_key='YOUR-ACCESSKEYID',
secret_key='YOUR-SECRETACCESSKEY',
secure=True,
)
1. Constructor
Minio(endpoint, access_key=None, secret_key=None, session_token=None, secure=True, region=None, http_client=None, credentials=None)
Minio(endpoint, access_key=None, secret_key=None, session_token=None, secure=True, region=None, http_client=None, credentials=None) |
| Initializes a new client object. |
Parameters
| Param | Type | Description |
|---|---|---|
endpoint |
str | Hostname of a S3 service. |
access_key |
str | (Optional) Access key (aka user ID) of your account in S3 service. |
secret_key |
str | (Optional) Secret Key (aka password) of your account in S3 service. |
session_token |
str | (Optional) Session token of your account in S3 service. |
secure |
bool | (Optional) Flag to indicate to use secure (TLS) connection to S3 service or not. |
region |
str | (Optional) Region name of buckets in S3 service. |
http_client |
urllib3.poolmanager.PoolManager | (Optional) Customized HTTP client. |
credentials |
minio.credentials.Credentials | (Optional) Credentials of your account in S3 service. |
NOTE on concurrent usage: The Minio object is thread safe when using the Python threading library. Specifically, it is NOT safe to share it between multiple processes, for example when using multiprocessing.Pool. The solution is simply to create a new Minio object in each process, and not share it between processes.
Example
MinIO
from minio import Minio
from minio.error import ResponseError
minioClient = Minio(
'play.min.io',
access_key='Q3AM3UQ867SPQQA43P2F',
secret_key='zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG',
)
NOTE: If there is a corporate proxy, specify a custom httpClient using urllib3.ProxyManager as shown below:
from minio import Minio
from minio.error import ResponseError
import urllib3
httpClient = urllib3.ProxyManager(
'https://proxy_host.sampledomain.com:8119/',
timeout=urllib3.Timeout.DEFAULT_TIMEOUT,
cert_reqs='CERT_REQUIRED',
retries=urllib3.Retry(
total=5,
backoff_factor=0.2,
status_forcelist=[500, 502, 503, 504],
)
)
minioClient = Minio(
'your_hostname.sampledomain.com:9000',
access_key='ACCESS_KEY',
secret_key='SECRET_KEY',
secure=True,
http_client=httpClient,
)
AWS S3
from minio import Minio
from minio.error import ResponseError
s3Client = Minio(
's3.amazonaws.com',
access_key='ACCESS_KEY',
secret_key='SECRET_KEY',
)
2. Bucket operations
make_bucket(self, bucket_name, location='us-east-1', object_lock=False)
Create a bucket with region and object lock.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
location |
str | Region in which the bucket will be created. |
object_lock |
bool | Flag to set object-lock feature. |
Example
minio.make_bucket('foo')
minio.make_bucket('foo', 'us-west-1')
minio.make_bucket('foo', 'us-west-1', object_lock=True)
list_buckets()
List information of all accessible buckets.
Parameters
| Return |
|---|
| An iterator contains bucket information. |
Example
bucket_list = minio.list_buckets()
for bucket in bucket_list:
print(bucket.name, bucket.creation_date)
bucket_exists(bucket_name)
Check if a bucket exists.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Example
found = minio.bucket_exists("my-bucketname")
if found:
print("my-bucketname exists")
else:
print("my-bucketname does not exist")
remove_bucket(bucket_name)
Remove an empty bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Example
minio.remove_bucket("my-bucketname")
list_objects(bucket_name, prefix=None, recursive=False, include_version=False)
Lists object information of a bucket using S3 API version 1, optionally for prefix recursively.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
prefix |
str | Object name starts with prefix. |
recursive |
bool | List recursively than directory structure emulation. |
include_version |
bool | Flag to control whether include object versions. |
Return Value
| Return |
|---|
| An iterator contains object information as minio.Object |
Example
# List objects information.
objects = minio.list_objects('foo')
for object in objects:
print(object)
# List objects information whose names starts with 'hello/'.
objects = minio.list_objects('foo', prefix='hello/')
for object in objects:
print(object)
# List objects information recursively.
objects = minio.list_objects('foo', recursive=True)
for object in objects:
print(object)
# List objects information recursively whose names starts with
# 'hello/'.
objects = minio.list_objects(
'foo', prefix='hello/', recursive=True,
)
for object in objects:
print(object)
# List objects information recursively after object name
# 'hello/world/1'.
objects = minio.list_objects(
'foo', recursive=True, start_after='hello/world/1',
)
for object in objects:
print(object)
get_bucket_policy(bucket_name)
Get bucket policy configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Return Value
| Param |
|---|
| Bucket policy configuration as JSON string. |
Example
config = minio.get_bucket_policy("my-bucketname")
set_bucket_policy(bucket_name, policy)
Set bucket policy configuration to a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Policy |
str | Bucket policy configuration as JSON string. |
Example
minio.set_bucket_policy("my-bucketname", config)
delete_bucket_policy(bucket_name)
Delete bucket policy configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Example
minio.delete_bucket_policy("my-bucketname")
get_bucket_notification(bucket_name)
Get notification configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Return Value
| Param |
|---|
| Notification configuration as dict. |
Example
config = minio.get_bucket_notification("my-bucketname")
set_bucket_notification(bucket_name, notification)
Set notification configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
notification |
dict | Non-empty dictionary with the structure specified below. |
The notification argument has the following structure:
- (dict) --
- TopicConfigurations (list) -- Optional list of service configuration items specifying AWS SNS Topics as the target of the notification.
- QueueConfigurations (list) -- Optional list of service configuration items specifying AWS SQS Queues as the target of the notification.
- CloudFunctionconfigurations (list) -- Optional list of service configuration items specifying AWS Lambda Cloud functions as the target of the notification.
At least one of the above items needs to be specified in the
notification argument.
The "service configuration item" alluded to above has the following structure:
- (dict) --
- Id (string) -- Optional Id for the configuration item. If not specified, it is auto-generated by the server.
- Arn (string) -- Specifies the particular Topic/Queue/Cloud Function identifier.
- Events (list) -- A non-empty list of event-type strings from: 's3:ReducedRedundancyLostObject', 's3:ObjectCreated:*', 's3:ObjectCreated:Put', 's3:ObjectCreated:Post', 's3:ObjectCreated:Copy', 's3:ObjectCreated:CompleteMultipartUpload', 's3:ObjectRemoved:*', 's3:ObjectRemoved:Delete', 's3:ObjectRemoved:DeleteMarkerCreated'
- Filter (dict) -- An optional dictionary container of object
key name based filter rules.
- Key (dict) -- Dictionary container of object key name prefix
and suffix filtering rules.
- FilterRules (list) -- A list of containers that specify
the criteria for the filter rule.
- (dict) -- A dictionary container of key value pairs that
specify a single filter rule.
- Name (string) -- Object key name with value 'prefix' or 'suffix'.
- Value (string) -- Specify the value of the prefix/suffix to which the rule applies.
- (dict) -- A dictionary container of key value pairs that
specify a single filter rule.
- FilterRules (list) -- A list of containers that specify
the criteria for the filter rule.
- Key (dict) -- Dictionary container of object key name prefix
and suffix filtering rules.
Example
config = {
'QueueConfigurations': [
{
'Id': '1',
'Arn': 'arn1',
'Events': ['s3:ObjectCreated:*'],
'Filter': {
'Key': {
'FilterRules': [
{
'Name': 'prefix',
'Value': 'abc'
}
]
}
}
}
],
'TopicConfigurations': [
{
'Arn': 'arn2',
'Events': ['s3:ObjectCreated:*'],
'Filter': {
'Key': {
'FilterRules': [
{
'Name': 'suffix',
'Value': '.jpg'
}
]
}
}
}
],
'CloudFunctionConfigurations': [
{
'Arn': 'arn3',
'Events': ['s3:ObjectRemoved:*'],
'Filter': {
'Key': {
'FilterRules': [
{
'Name': 'suffix',
'Value': '.jpg'
}
]
}
}
}
]
}
minio.set_bucket_notification("my-bucketname", config)
remove_all_bucket_notification(bucket_name)
Remove notification configuration of a bucket. On success, S3 service stops notification of events previously set of the bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Example
minio.remove_all_bucket_notification("my-bucketname")
listen_bucket_notification(bucket_name, prefix='', suffix='', events=('s3:ObjectCreated:', 's3:ObjectRemoved:', 's3:ObjectAccessed:*'))
Listen events of object prefix and suffix of a bucket. Caller should iterate returned iterator to read new events.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
prefix |
str | Listen events of object starts with prefix. |
suffix |
str | Listen events of object ends with suffix. |
events |
list | Events to listen. |
iter = minio.listen_bucket_notification(
"my-bucketname",
events=('s3:ObjectCreated:*', 's3:ObjectAccessed:*'),
)
for events in iter:
print(events)
get_bucket_encryption(bucket_name)
Get encryption configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Return Value
| Param |
|---|
| Encryption configuration as dict. |
Example
config = minio.get_bucket_encryption("my-bucketname")
put_bucket_encryption(bucket_name, encryption_configuration)
Set encryption configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
enc_config |
dict | Encryption configuration as dictionary to be set. |
Example
# Sample default encryption configuration
config = {
'ServerSideEncryptionConfiguration':{
'Rule': [
{'ApplyServerSideEncryptionByDefault': {'SSEAlgorithm': 'AES256'}}
]
}
}
minio.put_bucket_encryption("my-bucketname", config)
delete_bucket_encryption(bucket_name)
Delete encryption configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Example
minio.delete_bucket_encryption("my-bucketname")
get_bucket_versioning(bucket_name)
Get versioning configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Example
config = minio.get_bucket_versioning("my-bucketname")
print(config.status)
set_bucket_versioning(bucket_name, config)
Set versioning configuration to a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
config |
VersioningConfig | Versioning configuration. |
Example
minio.set_bucket_versioning("my-bucketname", VersioningConfig(ENABLED))
delete_bucket_replication(bucket_name)
Delete replication configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Example
minio.delete_bucket_replication("my-bucketname")
get_bucket_replication(bucket_name)
Get replication configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
| Return |
|---|
| ReplicationConfig object. |
Example
config = minio.get_bucket_replication("my-bucketname")
set_bucket_replication(bucket_name, config)
Set replication configuration to a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
config |
ReplicationConfig | Replication configuration. |
Example
config = ReplicationConfig(
"REPLACE-WITH-ACTUAL-ROLE",
[
Rule(
Destination(
"REPLACE-WITH-ACTUAL-DESTINATION-BUCKET-ARN",
),
ENABLED,
delete_marker_replication=DeleteMarkerReplication(
DISABLED,
),
rule_filter=Filter(
AndOperator(
"TaxDocs",
{"key1": "value1", "key2": "value2"},
),
),
rule_id="rule1",
priority=1,
),
],
)
minio.set_bucket_replication("my-bucketname", config)
delete_bucket_lifecycle(bucket_name)
Delete lifecycle configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
Example
minio.delete_bucket_lifecycle("my-bucketname")
get_bucket_lifecycle(bucket_name)
Get lifecycle configuration of a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
| Return |
|---|
| LifecycleConfig object. |
Example
config = minio.get_bucket_lifecycle("my-bucketname")
set_bucket_lifecycle(bucket_name, config)
Set lifecycle configuration to a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
config |
LifecycleConfig | Lifecycle configuration. |
Example
config = LifecycleConfig(
[
Rule(
ENABLED,
rule_filter=Filter(prefix="documents/"),
rule_id="rule1",
transition=Transition(days=30, storage_class="GLACIER"),
),
Rule(
ENABLED,
rule_filter=Filter(prefix="logs/"),
rule_id="rule2",
expiration=Expiration(days=365),
),
],
)
minio.set_bucket_lifecycle("my-bucketname", config)
3. Object operations
get_object(bucket_name, object_name, offset=0, length=0, request_headers=None, sse=None, version_id=None, extra_query_params=None)
Gets data from offset to length of an object. Returned response should be closed after use to release network resources. To reuse the connection, it's required to call response.release_conn() explicitly.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
offset |
int | Start byte position of object data. |
length |
int | Number of bytes of object data from offset. |
request_headers |
dict | Any additional headers to be added with GET request. |
sse |
SseCustomerKey | Server-side encryption customer key. |
version_id |
str | Version-ID of the object. |
extra_query_params |
dict | Extra query parameters for advanced usage. |
Return Value
| Return |
|---|
| urllib3.response.HTTPResponse object. |
Example
// Get entire object data.
try:
response = minio.get_object('foo', 'bar')
// Read data from response.
finally:
response.close()
response.release_conn()
// Get object data for offset/length.
try:
response = minio.get_object('foo', 'bar', 2, 4)
// Read data from response.
finally:
response.close()
response.release_conn()
select_object_content(bucket_name, object_name, opts)
Select content of an object by SQL expression.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
request |
SelectRequest | Select request. |
Return Value
| Return |
|---|
| A reader contains requested records and progress information as SelectObjectReader |
Example
request = SelectRequest(
"select * from s3object",
CSVInputSerialization(),
CSVOutputSerialization(),
request_progress=True,
)
data = client.select_object_content('my-bucket', 'my-object', request)
with open('my-record-file', 'w') as record_data:
for d in data.stream(10*1024):
record_data.write(d)
# Get the stats
print(data.stats())
fget_object(bucket_name, object_name, file_path, request_headers=None, sse=None, version_id=None, extra_query_params=None)
Downloads data of an object to file.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
file_path |
str | Name of file to download. |
request_headers |
dict | Any additional headers to be added with GET request. |
sse |
SseCustomerKey | Server-side encryption customer key. |
version_id |
str | Version-ID of the object. |
extra_query_params |
dict | Extra query parameters for advanced usage. |
Return Value
| Return |
|---|
| Object information as Object |
Example
minio.fget_object('foo', 'bar', 'localfile')
minio.fget_object(
'foo', 'bar', 'localfile', version_id='VERSION-ID',
)
copy_object(bucket_name, object_name, object_source, conditions=None, source_sse=None, sse=None, metadata=None)
Create an object by server-side copying data from another object. In this API maximum supported source object size is 5GiB.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
object_source |
str | Source object to be copied. |
conditions |
CopyConditions | Collection of supported CopyObject conditions. |
source_sse |
SseCustomerKey | Server-side encryption customer key of source object. |
sse |
Sse | Server-side encryption of destination object. |
metadata |
dict | Any user-defined metadata to be copied along with destination object. |
Return Value
| Return |
|---|
| ObjectWriteResult object. |
Example
import time
from datetime import datetime
from minio import CopyConditions
minio.copy_object(
"my-bucketname",
"my-objectname",
"my-source-bucketname/my-source-objectname",
)
minio.copy_object(
"my-bucketname",
"my-objectname",
"my-source-bucketname/my-source-objectname"
"?versionId=b6602757-7c9c-449b-937f-fed504d04c94",
)
copy_conditions = CopyConditions()
# Set modified condition, copy object modified since 2014 April.
t = (2014, 4, 0, 0, 0, 0, 0, 0, 0)
mod_since = datetime.utcfromtimestamp(time.mktime(t))
copy_conditions.set_modified_since(mod_since)
# Set unmodified condition, copy object unmodified since 2014 April.
copy_conditions.set_unmodified_since(mod_since)
# Set matching ETag condition, copy object which matches the following ETag.
copy_conditions.set_match_etag("31624deb84149d2f8ef9c385918b653a")
# Set matching ETag except condition, copy object which does not match the following ETag.
copy_conditions.set_match_etag_except("31624deb84149d2f8ef9c385918b653a")
# Set metadata, which will be copied along with the destination object.
metadata = {"test-key": "test-data"}
result = minioClient.copy_object(
"my-bucketname",
"my-objectname",
"my-source-bucketname/my-source-objectname",
copy_conditions,metadata=metadata,
)
print(result.object_name, result.version_id)
put_object(bucket_name, object_name, data, length, content_type='application/octet-stream', metadata=None, sse=None, progress=None, part_size=DEFAULT_PART_SIZE)
Uploads data from a stream to an object in a bucket.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
data |
io.RawIOBase | Contains object data. |
content_type |
str | Content type of the object. |
metadata |
dict | Any additional metadata to be uploaded along with your PUT request. |
sse |
Sse | Server-side encryption. |
progress |
threading | A progress object. |
part_size |
int | Multipart part size. |
Return Value
| Return |
|---|
| etag and version ID if available. |
Example
file_stat = os.stat('hello.txt')
with open('hello.txt', 'rb') as data:
minio.put_object(
'foo', 'bar', data, file_stat.st_size, 'text/plain',
)
fput_object(bucket_name, object_name, file_path, content_type='application/octet-stream', metadata=None, sse=None, progress=None, part_size=DEFAULT_PART_SIZE)
Uploads data from a file to an object in a bucket.
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
file_path |
str | Name of file to upload. |
content_type |
str | Content type of the object. |
metadata |
dict | Any additional metadata to be uploaded along with your PUT request. |
sse |
Sse | Server-side encryption. |
progress |
threading | A progress object. |
part_size |
int | Multipart part size. |
Return Value
| Return |
|---|
| etag and version ID if available. |
Example
minio.fput_object('foo', 'bar', 'filepath', 'text/plain')
stat_object(bucket_name, object_name, sse=None, version_id=None, extra_query_params=None)
Get object information and metadata of an object.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
sse |
SseCustomerKey | Server-side encryption customer key. |
version_id |
str | Version ID of the object. |
extra_query_params |
dict | Extra query parameters for advanced usage. |
Return Value
| Return |
|---|
| Object information as Object |
Example
stat = minio.stat_object("my-bucketname", "my-objectname")
remove_object(bucket_name, object_name, version_id=None)
Remove an object.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
version_id |
str | Version ID of the object. |
Example
minio.remove_object("my-bucketname", "my-objectname")
minio.remove_object(
"my-bucketname",
"my-objectname",
version_id="13f88b18-8dcd-4c83-88f2-8631fdb6250c",
)
remove_objects(bucket_name, objects_iter)
Remove multiple objects.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
objects_iter |
list | An iterable type python object providing object names for deletion. |
Return Value
| Return |
|---|
| An iterator contains MultiDeleteError |
Example
minio.remove_objects(
"my-bucketname",
[
"my-objectname1",
"my-objectname2",
("my-objectname3", "13f88b18-8dcd-4c83-88f2-8631fdb6250c"),
],
)
4. Presigned operations
presigned_get_object(bucket_name, object_name, expires=timedelta(days=7), response_headers=None, request_date=None, version_id=None, extra_query_params=None)
Get presigned URL of an object to download its data with expiry time and custom request parameters.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
expires |
datetime.timedelta | Expiry in seconds; defaults to 7 days. |
response_headers |
dict | Optional response_headers argument to specify response fields like date, size, type of file, data about server, etc. |
request_date |
datetime.datetime | Optional request_date argument to specify a different request date. Default is current date. |
version_id |
str | Version ID of the object. |
extra_query_params |
dict | Extra query parameters for advanced usage. |
Return Value
| Return |
|---|
| URL string |
Example
# Get presigned URL string to download 'my-objectname' in
# 'my-bucketname' with default expiry.
url = minio.presigned_get_object("my-bucketname", "my-objectname")
print(url)
# Get presigned URL string to download 'my-objectname' in
# 'my-bucketname' with two hours expiry.
url = minio.presigned_get_object(
"my-bucketname", "my-objectname", expires=timedelta(hours=2),
)
print(url)
presigned_put_object(bucket_name, object_name, expires=timedelta(days=7))
Get presigned URL of an object to upload data with expiry time and custom request parameters.
Parameters
| Param | Type | Description |
|---|---|---|
bucket_name |
str | Name of the bucket. |
object_name |
str | Object name in the bucket. |
expires |
datetime.timedelta | Expiry in seconds; defaults to 7 days. |
Return Value
| Return |
|---|
| URL string |
Example
# Get presigned URL string to upload data to 'my-objectname' in
# 'my-bucketname' with default expiry.
url = minio.presigned_put_object("my-bucketname", "my-objectname")
print(url)
# Get presigned URL string to upload data to 'my-objectname' in
# 'my-bucketname' with two hours expiry.
url = minio.presigned_put_object(
"my-bucketname", "my-objectname", expires=timedelta(hours=2),
)
print(url)
presigned_post_policy(post_policy)
Get form-data of PostPolicy of an object to upload its data using POST method.
Parameters
| Param | Type | Description |
|---|---|---|
post_policy |
PostPolicy | Post policy. |
Return Value
| Return |
|---|
| Form-data containing dict |
Example
Create policy:
post_policy = PostPolicy()
post_policy.set_bucket_name('bucket_name')
# set object prefix for object upload.
post_policy.set_key_startswith('objectPrefix/')
# set expiry to 10 days.
expires_date = datetime.utcnow()+timedelta(days=10)
post_policy.set_expires(expires_date)
# set content length for incoming uploads.
post_policy.set_content_length_range(10, 1024)
# set content-type to allow only text.
post_policy.set_content_type('text/plain')
form_data = presigned_post_policy(post_policy)
print(form_data)