https://stackoverflow.com/questions/24266114/pycharm-what-is-python-stubs
什麼情況下會出現跳轉到python_stubs？
當我們調用的函數是內置函數或僅二進制存在的函數(沒有py文件，只有pyc等)時，pycharm會對某個版本進行硬編碼而生成的僞函數（實際不是調用的這個，只是方便我們做開發）。
The python_stubs file is an automatically generated file that contains dummy definitions for built-in functions. It is used by PyCharm to infer the types of the built-in functions in the case that they weren't hardcoded for the given version.
https://peps.python.org/pep-0484/#stub-files