[Python-modules-team] Bug#958092: virtualenv: PIP fails with No module named 'pip._vendor.six'

[Arthur de Jong]

Package: virtualenv
Version: 20.0.17-1
Severity: important

Creating a virtualenv no longer works:

$ mkdir /tmp/a
$ cd /tmp/a
$ virtualenv venv
created virtual environment CPython3.8.2.final.0-64 in 443ms
  creator CPython3Posix(dest=/tmp/a/venv, clear=False, global=False)
  seeder FromAppData(download=False, contextlib2=latest, webencodings=latest, setuptools=latest, pip=latest, retrying=latest, pep517=latest, requests=latest, packaging=latest, certifi=latest, distro=latest, html5lib=latest, chardet=latest, distlib=latest, progress=latest, appdirs=latest, pkg_resources=latest, msgpack=latest, pytoml=latest, CacheControl=latest, wheel=latest, colorama=latest, lockfile=latest, pyparsing=latest, urllib3=latest, idna=latest, six=latest, via=copy, app_data_dir=/home/arthur/.local/share/virtualenv/seed-app-data/v1.0.1.debian)
  activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator
$ ./venv/bin/pip --version
Traceback (most recent call last):
  File "./venv/bin/pip", line 5, in <module>
    from pip._internal.cli.main import main
  File "/tmp/a/venv/lib/python3.8/site-packages/pip/_internal/cli/main.py", line 10, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/tmp/a/venv/lib/python3.8/site-packages/pip/_internal/cli/autocompletion.py", line 9, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/tmp/a/venv/lib/python3.8/site-packages/pip/_internal/cli/main_parser.py", line 7, in <module>
    from pip._internal.cli import cmdoptions
  File "/tmp/a/venv/lib/python3.8/site-packages/pip/_internal/cli/cmdoptions.py", line 24, in <module>
    from pip._internal.exceptions import CommandError
  File "/tmp/a/venv/lib/python3.8/site-packages/pip/_internal/exceptions.py", line 10, in <module>
    from pip._vendor.six import iteritems
ModuleNotFoundError: No module named 'pip._vendor.six'

I have tried with --download and --no-download, removing ~/.cache/pip
but have not found a way to make a working virtualenv.

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.5.0-1-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages virtualenv depends on:
ii  python3-virtualenv  20.0.17-1

virtualenv recommends no packages.

virtualenv suggests no packages.

-- no debconf information

-- 
-- arthur - adejong at debian.org - https://people.debian.org/~adejong --

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