[Python] How to create a blob container in Azure using Python?

I am a novice in Python programming and trying to create a blob container using python. Even after following the documented steps, I see the error below.

Here is my code:

import os, uuid
from azure.storage.blob import BlobServiceClient,BlobClient,ContainerClient,__version__

class BlobSamples():
print("Azure Blob Storage v" + __version__ + " - Python quickstart sample")
connection_str = os.getenv('AZURE_STORAGE_CONNECTION_STRING')
print("Connection established to Azure storage account from the Python App")

#--Begin Blob Samples-----------------------------------------------------------------
def create_container_sample(self):
# Instantiate a new BlobServiceClient using a connection string
blob_service_client = BlobServiceClient.from_connection_string(self.connection_str)

# Instantiate a new ContainerClient
container_client = blob_service_client.get_container_client("mycontainer")

try:
# Create new container in the service
container_client.create_container()
# List containers in the storage account
list_response = blob_service_client.list_containers()
except Exception as ex:
print('Exception:')
print(ex)
#main program
sample = BlobSamples()
sample.create_container_sample()


Error:

py ConnectionString.py
Azure Blob Storage v12.9.0 - Python quickstart sample
Connection established to Azure storage account from the Python App
Traceback (most recent call last):
File "C:\Technical docs\cloud computing\MS Azure\blob-quickstart-v12\menu-driven-strg-ops\ConnectionString.py", line 31, in <module>
sample.create_container_sample()
File "C:\Technical docs\cloud computing\MS Azure\blob-quickstart-v12\menu-driven-strg-ops\ConnectionString.py", line 16, in create_container_sample
blob_service_client = BlobServiceClient.from_connection_string(self.connection_str)
File "C:\Python-InstallPath\lib\site-packages\azure\storage\blob\_blob_service_client.py", line 174, in from_connection_string
`enter code here`account_url, secondary, credential = parse_connection_str(conn_str, credential, 'blob')
File "C:\Python-InstallPath\lib\site-packages\azure\storage\blob\_shared\base_client.py", line 363, in parse_connection_str
conn_str = conn_str.rstrip(";")
AttributeError: 'NoneType' object has no attribute 'rstrip'

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