pip documentation v21.0.1 commands: debug: Use packaging.version.parse to compare between versions. (#9461) New resolver: Download and prepare a distribution only at the last possible moment to avoid unnecessary network access when the same version is already installed locally. (#9516) Drop support for Python 2. (#6148) Remove support for legacy wheel cache entries that were created with pip versions older than 20.0. (#7502) Remove support for VCS pseudo URLs editable requirements. It was emitting deprecation warning since version 20.0. (#7554) Modernise the codebase after Python 2. (#8802) Drop support for Python 3.5. (#9189) Remove the VCS export feature that was used only with editable VCS requirements and had correctness issues. (#9338) --ignore-requires-python support to pip download. (#1884)