[BUG] [PYTHON] Missing 'typing_extensions' in requirements.txt

[rickwporter]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The Python client requirements.txt file is missing the typing_extensions requirement. Not sure if this is required for all Python versions, but I'm running Python 3.8.14 due to organizational constraints.

openapi-generator version

I'm in the process of upgrading from v6.0.0 to v6.2.0.

OpenAPI declaration file content or url

None needed.

Generation Details

Here's a semi-cooked version of my make regen output that regenerates the code and install prerequisites and the code:

host % make regen
rm -rf openapi_gen_controller.log controller_client
docker run --rm -v /Users/rwporter/src/my_project:/local --user 501:20 openapitools/openapi-generator-cli:v6.2.0 generate \
        -i /local/schemas/my_service.yaml \
        -g python \
        -o /local/cli/controller_client \
        --additional-properties=packageName=my_service,packageVersion=1.0.2,enumUnknownDefaultCase=true,supportAsync=false \
        > openapi_gen_controller.log
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.github.jknack.handlebars.context.FieldValueResolver$FieldMember (file:/opt/openapi-generator/modules/openapi-generator-cli/target/openapi-generator-cli.jar) to field java.util.HashMap.table
WARNING: Please consider reporting this to the maintainers of com.github.jknack.handlebars.context.FieldValueResolver$FieldMember
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
cd controller_client && HTTP_PROXY=http://www-proxy-ash7.us.oracle.com:80 HTTPS_PROXY=http://www-proxy-ash7.us.oracle.com:80 python3 -m pip install --user --upgrade -r requirements.txt
Requirement already satisfied: certifi>=14.05.14 in /Users/rwporter/Library/Python/3.8/lib/python/site-packages (from -r requirements.txt (line 1)) (2022.9.24)
Requirement already satisfied: frozendict>=2.0.3 in /Users/rwporter/Library/Python/3.8/lib/python/site-packages (from -r requirements.txt (line 2)) (2.3.4)
Requirement already satisfied: python_dateutil>=2.5.3 in /Users/rwporter/Library/Python/3.8/lib/python/site-packages (from -r requirements.txt (line 3)) (2.8.2)
Requirement already satisfied: setuptools>=21.0.0 in /Users/rwporter/Library/Python/3.8/lib/python/site-packages (from -r requirements.txt (line 4)) (65.4.1)
Requirement already satisfied: urllib3>=1.15.1 in /Users/rwporter/Library/Python/3.8/lib/python/site-packages (from -r requirements.txt (line 5)) (1.26.12)
Requirement already satisfied: six>=1.5 in /Users/rwporter/Library/Python/3.8/lib/python/site-packages (from python_dateutil>=2.5.3->-r requirements.txt (line 3)) (1.16.0)
cd controller_client &&  python3 setup.py install --user --prefix= > ../install_controller.log
/Users/rwporter/Library/Python/3.8/lib/python/site-packages/setuptools/command/install.py:34: SetuptoolsDeprecationWarning: setup.py install is deprecated. Use build and pip and other standards-based tools.
  warnings.warn(
/Users/rwporter/Library/Python/3.8/lib/python/site-packages/setuptools/command/easy_install.py:144: EasyInstallDeprecationWarning: easy_install command is deprecated. Use build and pip and other standards-based tools.
  warnings.warn(
zip_safe flag not set; analyzing archive contents...

After I do that, I try to run my main program that uses the generated Python client code, and I get:

host % ./cli.py
Traceback (most recent call last):
  File "./cli.py", line 10, in <module>
    from my_service import ApiClient
  File "<frozen zipimport>", line 259, in load_module
  File "/Users/rwporter/Library/Python/3.8/lib/python/site-packages/my_service-1.0.2-py3.8.egg/my_service/__init__.py", line 17, in <module>
  File "<frozen zipimport>", line 259, in load_module
  File "/Users/rwporter/Library/Python/3.8/lib/python/site-packages/my_service-1.0.2-py3.8.egg/my_service/api_client.py", line 23, in <module>
ModuleNotFoundError: No module named 'typing_extensions'
host %

Steps to reproduce

• Uninstall the typing_extensions module (initial state of my machine):

python3 -m pip uninstall -y typing_extensions

• Generate your Python code with v6.2.0 (as shown above)
• Install the generated prerequisites and generated code (as shown above)
• Try running code that uses generated code, and see the typing_extensions are missing

Related issues/PRs

I did not see any related issues.

Suggest a fix

Add the following line to the templates that generate Python requirements files:

typing_extensions (~= 4.3.0)

I was able to work around this by adding it to a higher level requirements.txt file, but it seems appropriate to add it to the generated Python client code.