Public bug reported:
Debian and Ubuntu’s Python 3.9 (and prior) patches distutils so pip
installs things to /usr/local/lib/python3.Y/dist-packages, but 3.10 does
not do the same:
$ python3.10
Python 3.10.0b1 (default, May 11 2021, 08:45:09) [GCC 10.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from distutils.command.install import install
<stdin>:1: DeprecationWarning: The distutils package is deprecated and slated
for removal in Python 3.12. Use setuptools or check PEP 632 for potential
alternatives
>>> from distutils.dist import Distribution
>>> c = install(Distribution())
>>> c.finalize_options()
>>> c.install_platlib
'/usr/lib/python3.10/dist-packages'
Furthermore, pip is planning to switch to sysconfig for fetching the
path soon (could happen before Ubuntu 21.10), and 3.10’s sysconfig is
currently returning a different, but still unexpected path:
>>> import sysconfig
>>> sysconfig.get_path('platlib')
'/usr/lib/python3.10/site-packages'
Neither path would break the system (apt puts packages under
/usr/lib/python3/dist-packages), but my understanding is pip installing
things into /usr/lib is still not ideal. So both of those need to be
fixed, and they need to point to the same location (also purelib,
headers/include, scripts, and data).
----
Some context to this: The python3.10 package is backported to earlier
Ubuntu versions by deadsnakes, which does not ship python3.10-pip, so
people are installing the upstream pip directly. And when they do this,
/usr/bin/pip gets overwritten unexpectedly.
deadsnakes: https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa
** Affects: python3.10 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1940705
Title:
distutils and sysconfig returns unexpected paths
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