[Python] python 3.8 package installed but pkg_resources not able to found

Using old python version 3.8.6.

I created virtual environment in /var/virtualenvs/myvenv and installed mypkg.bouncer.client but when we import that, it gives below error.

Traceback (most recent call last):
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/mypkg/contrib/myapp/wsgi.py", line 22, in <module>
application = get_wsgi_application()
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/django/core/wsgi.py", line 13, in get_wsgi_application
return WSGIHandler()
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/django/core/handlers/wsgi.py", line 127, in __init__
self.load_middleware()
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/django/core/handlers/base.py", line 40, in load_middleware
middleware = import_string(middleware_path)
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/django/utils/module_loading.py", line 17, in import_string
module = import_module(module_path)
File "/lib/python3.8/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/mypkg/contrib/myapi/authentication/middleware.py", line 14, in <module>
from mypkg.bouncer.client import endpoints
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/mypkg/bouncer/client/__init__.py", line 16, in <module>
__version__ = pkg_resources.get_distribution("mypkg.bouncer.client").version
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/pkg_resources/__init__.py", line 534, in get_distribution
dist = get_provider(dist)
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/pkg_resources/__init__.py", line 417, in get_provider
return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/pkg_resources/__init__.py", line 1070, in require
needed = self.resolve(parse_requirements(requirements))
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/pkg_resources/__init__.py", line 897, in resolve
dist = self._resolve_dist(
File "/var/virtualenvs/myvenv/lib/python3.8/site-packages/pkg_resources/__init__.py", line 938, in _resolve_dist
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'mypkg.bouncer.client' distribution was not found and is required by the application


When we check the pip freeze to make sure that package is installed, it gives the package name.

[user@test-01 ~]$ /var/virtualenvs/myvenv/bin/python -m pip freeze | grep mypkg.bouncer.client
mypkg.bouncer.client==0.X.Y


I also check the files exists in the lib/site-packages

[myuser@test-01 ~]$ ls -al /var/virtualenvs/myvenv/lib/python3.8/site-packages/mypkg/bouncer/client/
total 32
drwxrwxr-x 3 myuser users 136 Apr 29 11:28 .
drwxrwxr-x 5 myuser users 104 Apr 29 11:28 ..
-rw-rwxr-- 1 myuser users 454 Apr 29 11:28 endpoints.py
-rw-rwxr-- 1 myuser users 1301 Apr 29 11:28 errors.py
-rw-rwxr-- 1 myuser users 481 Apr 29 11:28 __init__.py
drwxrwxr-x 2 myuser users 189 Apr 29 11:28 __pycache__


not sure why its giving error?

EDIT

I found that, its due to working_set.by_key is not updated with mypkg.bouncer.client.

sudo /var/virtualenvs/myenv/bin/python -c 'import pkg_resources;print(pkg_resources.working_set.by_key)' this dont have entry for mypkg.

How this by_key is updated ?

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