"packaging" package missing from project interpreter
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My project uses Pipenv. One of the packages listed in my Pipenv file is "packaging". When I open up python files in PyCharm, I'm shown the following message.

I have clicked "Install requirements from Pipfile.lock" and the package "installs"; however, I'm still shown the message.
No matter how many times I "install" the package, the "packaging" package doesn't appear in the project interpreter's list of installed packages. But, if I go to terminal and simply type `pip list` the package is shown as installed.
I've deleted the interpreter, invalidated the caches & restarted, then re created the interpreter; however, the same behavior persists.
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Hi,
It seems to happen because pipenv graph command (which PyCharm uses) doesn't show that package as installed while pip list does.
I filed an issue to our tracker https://youtrack.jetbrains.com/issue/PY-38191, please vote for it and follow for updates.
For now, you could just click Ignore requirement to get rid of the warning.