In the case of python, it's all built-in. People just don't know their tools.

  $ python
  Python 3.13.2 (main, Mar  6 2025, 08:26:01) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import os
  >>> help(os)

Not so great if you don't know the import or it's not intuitive (pathlib, shutil).