Azure functions unable to import certain python packages - python-3.x

Question

when using azure functions I have the problem that certain packages (e.g. azure.kusto.data) can not be installed from the init file.
My init file looks like this:
import datetime
import logging
from azure.kusto.data.helpers import dataframe_from_result_table
import azure.functions as func
def main(mytimer: func.TimerRequest) -> None:
utc_timestamp = datetime.datetime.utcnow().replace(
tzinfo=datetime.timezone.utc).isoformat()
if mytimer.past_due:
logging.info('The timer is past due!')
logging.info('Python timer trigger function ran at %s', utc_timestamp)
My requirements.txt file contains:
azure-functions
azure-kusto-data
The error message is the following:
Result: Failure
Exception: AssertionError:
Stack: File "C:\Users\hanft\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\python\3.9/WINDOWS/X64\azure_functions_worker\dispatcher.py", line 301, in _handle__function_load_request
func = loader.load_function(
File "C:\Users\hanft\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\python\3.9/WINDOWS/X64\azure_functions_worker\utils\wrappers.py", line 40, in call
return func(*args, **kwargs)
File "C:\Users\hanft\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\python\3.9/WINDOWS/X64\azure_functions_worker\loader.py", line 83, in load_function
mod = importlib.import_module(fullmodname)
File "C:\Users\hanft\AppData\Local\Programs\Python\Python39\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 855, in exec_module
File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
File "C:\Users\hanft\Documents\azuretestneu\jobs_creator\__init__.py", line 3, in <module>
from azure.kusto.data.helpers import dataframe_from_result_table
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\kusto\data\__init__.py", line 5, in <module>
from .client import KustoClient, KustoConnectionStringBuilder, ClientRequestProperties
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\kusto\data\client.py", line 22, in <module>
from .security import _AadHelper
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\kusto\data\security.py", line 5, in <module>
from ._token_providers import *
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\kusto\data\_token_providers.py", line 10, in <module>
from azure.identity import ManagedIdentityCredential, AzureCliCredential
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\identity\__init__.py", line 9, in <module>
from ._credentials import (
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\identity\_credentials\__init__.py", line 5, in <module>
from .authorization_code import AuthorizationCodeCredential
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\identity\_credentials\authorization_code.py", line 8, in <module>
from .._internal.aad_client import AadClient
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\identity\_internal\__init__.py", line 50, in <module>
from .certificate_credential_base import CertificateCredentialBase
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\identity\_internal\certificate_credential_base.py", line 11, in <module>
from .persistent_cache import load_service_principal_cache
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\azure\identity\_internal\persistent_cache.py", line 9, in <module>
import msal_extensions
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\msal_extensions\__init__.py", line 12, in <module>
from .cache_lock import CrossPlatLock
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\msal_extensions\cache_lock.py", line 5, in <module>
import portalocker
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\portalocker\__init__.py", line 4, in <module>
from . import portalocker
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\portalocker\portalocker.py", line 10, in <module>
import pywintypes
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\win32\lib\pywintypes.py", line 105, in <module>
__import_pywin32_system_module__("pywintypes", globals())
File "C:\Users\hanft\Documents\azuretestneu\.venv\lib\site-packages\win32\lib\pywintypes.py", line 99, in __import_pywin32_system_module__
assert sys.modules[modname] is not old_mod
When removing the line
from azure.kusto.data.helpers import dataframe_from_result_table
from the init file, everything works fine.
I tried reinstalling python and visual studio code.
Any help would be appreciated!

Answer 1

As the trace suggests, pywin32 is a transitive dependency of azure-identity, an authentication library azure-kusto-data uses (azure-sdk-for-python#19989 has more detail on the problem, if you're curious). The latest version of azure-identity (1.6.1) imports that dependency only when necessary, to implement an optional feature. Happily, azure-kusto-data doesn't use that feature, so you should be able to work around this by upgrading azure-identity.