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In my Python installation for python3.7, ctypes is installed. For example, __init__.py is located in: /usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ctypes/__init__.py. This makes sense to me.

Note: my OS is MacOS Mojave, 10.14.3.

ctypes constantly refers to _ctypes. I use PyCharm, and when I control-left click on _ctypes, it takes me to: /Users/myuser/Library/Caches/PyCharmCE2018.3/python_stubs/-1199943126/_ctypes.py.

Why is _ctypes.py in this random folder, and not in the folder installed with Python 3.7?

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There's no real _ctypes.py. That file you're seeing is something PyCharm created so it could show you fake source code. It's in that weird place because it's fake. I don't know why PyCharm does that.

The real source code for _ctypes is in C, and it doesn't make it into your Python distribution. You can see it in the CPython repository under the Modules/_ctypes folder. You can see where the compiled file for _ctypes is by importing _ctypes and inspecting _ctypes.__file__, but it's compiled, so for most purposes, you'll want to look at the source code instead.

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Here is info on PyCharm and python_stubs: stackoverflow.com/questions/24266114/…
Also @user2357112, thank you for sharing the link to GitHub. Where do you think I can find cpython/Modules/_ctypes folder on my local machine? I don't see it in site-packages and a search of my Mac via Finder doesn't yield anything
@IntrastellarExplorer: Like I said, it's probably not on your local machine at all.

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