[Bug 1847510] [NEW] python3 distutils reports path which is not in sys.path for /usr/local prefix

[Tobias Faller]

*** This bug is a duplicate of bug 1814653 ***
    https://bugs.launchpad.net/bugs/1814653

Public bug reported:

sysconfig.distutils.get_python_lib() reports the path '/usr/local/lib/python3/dist-packages' for the prefix '/usr/local'.
This does not match the path '/usr/local/lib/python3.6/dist-packages' which is listed in sys.path.

Command: python3 -c "from distutils import sysconfig; print(sysconfig.get_python_lib(prefix='/usr/local'))"
Output: /usr/local/lib/python3/dist-packages

Command: python3 -c "import sys; print(sys.path)"
Output: ['', '/usr/local/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/administrator/.local/lib/python3.6/site-packages', '/usr/local/lib/python3.6/dist-packages', '/usr/lib/python3/dist-packages']

Ubuntu release version: Ubuntu 18.04.3 LTS
python3-distutils version: 3.6.8~18.04

If this is a bug then this could be fixed by patching
distutils/sysconfig.py in some way. (attached)

** Affects: python3-defaults (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: python3

** Patch added: "distutils/sysconfig.py patch"
   https://bugs.launchpad.net/bugs/1847510/+attachment/5296038/+files/python3_path_mismatch.patch

** This bug has been marked a duplicate of bug 1814653
    get_python_lib() returns path to python3 instead of python3.6

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https://bugs.launchpad.net/bugs/1847510

Title:
  python3 distutils reports path which is not in sys.path for /usr/local
  prefix

Status in python3-defaults package in Ubuntu:
  New

Bug description:
  sysconfig.distutils.get_python_lib() reports the path '/usr/local/lib/python3/dist-packages' for the prefix '/usr/local'.
  This does not match the path '/usr/local/lib/python3.6/dist-packages' which is listed in sys.path.

  Command: python3 -c "from distutils import sysconfig; print(sysconfig.get_python_lib(prefix='/usr/local'))"
  Output: /usr/local/lib/python3/dist-packages

  Command: python3 -c "import sys; print(sys.path)"
  Output: ['', '/usr/local/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/administrator/.local/lib/python3.6/site-packages', '/usr/local/lib/python3.6/dist-packages', '/usr/lib/python3/dist-packages']

  Ubuntu release version: Ubuntu 18.04.3 LTS
  python3-distutils version: 3.6.8~18.04

  If this is a bug then this could be fixed by patching
  distutils/sysconfig.py in some way. (attached)

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