What is the difference between installing a module with pip/setup.py vs adding it to PYTHONPATH?

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I have a custom Python module I want to use in another project. I have two options:

  1. Add a setup.py and install the module locally with pip.
  2. Add the location of the module to the PYTHONPATH environment variable.

What are the tradeoffs? I know instinctively that using pip with a setup.py should be preferred, but can’t point to any concrete evidence why.

  • python
  • pip
  • python-module
  • setup.py

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