Releasing pip 20.3, featuring new dependency resolver

Baca Juga

On
behalf of the Python Packaging Authority and the pip team, I am pleased to announce that we have just released
pip 20.3, a new version of pip. You can install it by running python -m pip install --upgrade pip.

This is an important and disruptive release -- we explained why in a blog post last year. We've even made a video about it.

Highlights

• 
  

  DISRUPTION: Switch to the new dependency resolver by default.
  Watch out for changes in handling editable installs, constraints
  files, and more: https://pip.pypa.io/en/latest/user_guide/#changes-to-the-pip-dependency-resolver-in-20-3-2020

  
  
• 
  

  DEPRECATION: Deprecate support for Python 3.5 (to be removed in pip 21.0).

  
  
• 
  

  DEPRECATION: pip freeze will stop filtering the pip,
  setuptools, distribute and wheel packages from pip freeze output in a
  future version. To keep the previous behavior, users should use the new
  --exclude option.

  
  
• 
  

  Substantial improvements in new resolver for performance, output and
  error messages, avoiding infinite loops, and support for constraints
  files.

  
  
• 
  

  Support for PEP 600: Future manylinux Platform Tags for Portable Linux Built Distributions.

  
  
• 
  

  Documentation improvements: Resolver migration guide, quickstart guide, and new documentation theme.

  
  
• 
  

  Add support for MacOS Big Sur compatibility tags.

  
  

The new resolver is now on by default for Python 3 users. It is significantly
stricter and more consistent when it receives incompatible instructions,
and reduces support for certain kinds of constraints files, so some
workarounds and workflows may break. Please see our guide on how to test and migrate, and how to report issues. You can use the deprecated (old) resolver, using the flag --use-deprecated=legacy-resolver, until we remove it in the pip 21.0 release in January 2021.

You can find more details (including deprecations and removals) in the changelog.

Coming soon: end of Python 2.7 support

We aim to release pip 21.0 in January 2021, per our release cadence. At that time, pip will stop supporting Python 2.7 and will therefore stop supporting Python 2 entirely.

 

When users use pip 20.3 in a Python 2 environment, the old dependency resolver is still the default.

For more info or to contribute:

We run this project as transparently as possible, so you can:

• read and participate in GitHub issues
  
• contribute to our user experience work: sign up to become a member of the UX Studies group (after you join, we'll notify you about future UX surveys and interviews) 
• contact us in the Discourse forum or Zulip chat 
• read our meeting notes
  

Thank you

Thanks to our
contractors on this project: Simply Secure (specifically Georgia Bullen, Bernard Tyers, Nicole Harris, Ngọc Triệu, and Karissa McKelvey), Changeset Consulting (Sumana Harihareswara), Atos (Paul F. Moore), Tzu-ping Chung, Pradyun Gedam, and Ilan Schnell. Thanks also to Ernest W. Durbin III at the Python Software Foundation for liaising with the project.

 

This award continues our relationship with Mozilla, which supported Python packaging tools with a Mozilla Open Source Support Award in 2017 for Warehouse.
Thank you, Mozilla! (MOSS has a number of types of awards, which are
open to different sorts of open source/free software projects. If your
project will seek financial support in 2021, do check the MOSS website to see if you qualify.)

This is new
funding from the Chan Zuckerberg Initiative. This project is being made
possible in part by a grant from the Chan Zuckerberg Initiative DAF, an
advised fund of Silicon Valley Community Foundation. Thank you, CZI! (If
your free software/open source project is seeking funding and is used by researchers,
check the Joint Roadmap for Open Science Tools Rapid Response Fund and consider applying.)

 

The funding for pip's overhaul will end at the end of 2020; if your organization wants to help continue improvements in Python packaging, please join the sponsorship program.

As with all pip releases, a significant amount of the work was
contributed by pip's user community. Huge thanks to all who have
contributed, whether through code, documentation, issue reports and/or
discussion. Your help keeps pip improving, and is hugely appreciated. Thank you to the pip and PyPA
maintainers, to the PSF and the Packaging WG, and to all the
contributors and volunteers who work on or use Python packaging tools.

 

-Sumana Harihareswara, pip project manager