Pip has dropped support for Python 2

• PROCESS Version numbers are now simply X.Y where the leading 1 has been dropped.

• BACKWARD INCOMPATIBLE Dropped support for Python 3.1.

• BACKWARD INCOMPATIBLE Removed the bundle support which was deprecated in 1.4. (#1806)

• BACKWARD INCOMPATIBLE File lists generated by pip show -f are now rooted at the location reported by show, rather than one (unstated) directory lower. (#1933)

• BACKWARD INCOMPATIBLE The ability to install files over the FTP protocol was accidentally lost in pip 1.5 and it has now been decided to not restore that ability.

• BACKWARD INCOMPATIBLE PEP 440 is now fully implemented, this means that in some cases versions will sort differently or version specifiers will be interpreted differently than previously. The common cases should all function similarly to before.

• DEPRECATION pip install --download-cache and pip wheel --download-cache command line flags have been deprecated and the functionality removed. Since pip now automatically configures and uses it’s internal HTTP cache which supplants the --download-cache the existing options have been made non functional but will still be accepted until their removal in pip v8.0. For more information please see https://pip.pypa.io/en/stable/reference/pip_install.html#caching

• DEPRECATION pip install --build and pip install --no-clean are now NOT deprecated. This reverses the deprecation that occurred in v1.5.3. (#906)

• DEPRECATION Implicitly accessing URLs which point to an origin which is not a secure origin, instead requiring an opt-in for each host using the new --trusted-host flag (pip install --trusted-host example.com foo).

• Allow the new --trusted-host flag to also disable TLS verification for a particular hostname.

• Added a --user flag to pip freeze and pip list to check the user site directory only.

• Silence byte compile errors when installation succeed. (#1873)

• Added a virtualenv-specific configuration file. (#1364)

• Added site-wide configuration files. (1978)

• Added an automatic check to warn if there is an updated version of pip available. (#2049)

• wsgiref and argparse (for >py26) are now excluded from pip list and pip freeze. (#1606, #1369)

• Add --client-cert option for SSL client certificates. (#1424)

• pip show --files was broken for wheel installs. (#1635, #1484)

• install_lib should take precedence when reading distutils config. (#1642, #1641)

• Send Accept-Encoding: identity when downloading files in an attempt to convince some servers who double compress the downloaded file to stop doing so. (#1688)

• Stop breaking when given pip commands in uppercase (#1559, #1725)

• pip no longer adds duplicate logging consumers, so it won’t create duplicate output when being called multiple times. (#1618, #1723)

• pip wheel now returns an error code if any wheels fail to build. (#1769)

• pip wheel wasn’t building wheels for dependencies of editable requirements. (#1775)

• Allow the use of --no-use-wheel within a requirements file. (#1859)

• Attempt to locate system TLS certificates to use instead of the included CA Bundle if possible. (#1680, #1866)

• Allow use of Zip64 extension in Wheels and other zip files. (#1319, #1868)

• Properly handle an index or --find-links target which has a <base> without a href attribute. (#1101, #1869)

• Properly handle extras when a project is installed via Wheel. (#1885, #1896)

• Added support to respect proxies in pip search. (#1180, #932, #1104, #1902)

• pip install --download works with vcs links. (#798, #1060, #1926)

• Disabled warning about insecure index host when using localhost. Based off of Guy Rozendorn’s work in #1718. (#1456, #1967)

• Allow the use of OS standard user configuration files instead of ones simply based around $HOME. (#2021)

• When installing directly from wheel paths or urls, previous versions were not uninstalled. (#1825, #804, #1838)

• Detect the location of the .egg-info directory by looking for any file located inside of it instead of relying on the record file listing a directory. (#2075, #2076)

• Use a randomized and secure default build directory when possible. (#1964, #1935, #676, #2122, CVE-2014-8991)

• Support environment markers in requirements.txt files. (#1433, #2134)

• Automatically retry failed HTTP requests by default. (#1444, #2147)

• Handle HTML Encoding better using a method that is more similar to how browsers handle it. (#1100, #1874)

• Reduce the verbosity of the pip command by default. (#2175, #2177, #2178)

• Fixed #2031 - Respect sys.executable on OSX when installing from Wheels.

• Display the entire URL of the file that is being downloaded when downloading from a non PyPI repository. (#2183)

• Support setuptools style environment markers in a source distribution. (#2153)

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