P: /usr/lib/python3.9/site-packages/pip/_internal

[ .. ]

F: __init__.py
D: __pycache__
F: build_env.py
F: cache.py
D: cli
D: commands
F: configuration.py
D: distributions
F: exceptions.py
D: index
D: locations
F: main.py
D: metadata
D: models
D: network
D: operations
F: pyproject.py
D: req
D: resolution
F: self_outdated_check.py
D: utils
D: vcs
F: wheel_builder.py