setuptools: [BUG] error in XXXX setup command: use_2to3 is invalid when false.

setuptools version

setuptools==58.0.2

Python version

Python 3.6.9, Python 3.9.2

OS

Ubuntu 18.04.5 LTS, Debian 11

Additional environment information

This happens installing any Python2 package when trying to use use_2to3 on setuptool execution

Description

Error installing a package that requires to use use_2to3 on its installation

Expected behavior

The package should be installed as previous versions do (like setuptools==58.0.1)

How to Reproduce

1. Generate a virtualenv and activate it.
2. Make sure you’re environment tools are updated.
3. Install a Python2 package that requires to use use_2to3 on its installation.

Output

1. Generate a virtualenv like:

virtualenv .env -p /usr/bin/python3 && source .env/bin/activate
created virtual environment CPython3.9.2.final.0-64 in 121ms
  creator CPython3Posix(dest=/home/miguelfito/tmp/pruebas/devops_housekeeping_test/.env, clear=False, no_vcs_ignore=False, global=False)
  seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/miguelfito/.local/share/virtualenv)
    added seed packages: pip==20.3.4, pkg_resources==0.0.0, setuptools==44.1.1, wheel==0.34.2
  activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator

1. Make sure you’re environment tools are updated:

python3 -m pip install --upgrade pip setuptools wheel
Looking in indexes: ****
Requirement already satisfied: pip in ./.env/lib/python3.9/site-packages (20.3.4)
Collecting pip
  Downloading pip-21.2.4-py3-none-any.whl (1.6 MB)
     |████████████████████████████████| 1.6 MB 5.4 MB/s 
Requirement already satisfied: setuptools in ./.env/lib/python3.9/site-packages (44.1.1)
Collecting setuptools
  Downloading setuptools-58.0.2-py3-none-any.whl (816 kB)
     |████████████████████████████████| 816 kB 20.9 MB/s 
Requirement already satisfied: wheel in ./.env/lib/python3.9/site-packages (0.34.2)
Collecting wheel
  Downloading wheel-0.37.0-py2.py3-none-any.whl (35 kB)
Installing collected packages: wheel, setuptools, pip
  Attempting uninstall: wheel
    Found existing installation: wheel 0.34.2
    Uninstalling wheel-0.34.2:
      Successfully uninstalled wheel-0.34.2
  Attempting uninstall: setuptools
    Found existing installation: setuptools 44.1.1
    Uninstalling setuptools-44.1.1:
      Successfully uninstalled setuptools-44.1.1
  Attempting uninstall: pip
    Found existing installation: pip 20.3.4
    Uninstalling pip-20.3.4:
      Successfully uninstalled pip-20.3.4
Successfully installed pip-21.2.4 setuptools-58.0.2 wheel-0.37.0

1. Install a Python2 package:

pip install mailer==0.8.1                            
Looking in indexes: **********
Collecting mailer==0.8.1
  Downloading mailer-0.8.1.zip (6.5 kB)
    ERROR: Command errored out with exit status 1:
     command: /home/miguelfito/tmp/pruebas/devops_housekeeping_test/.env/bin/python3 -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-k06h_9aq/mailer_e0ec5902e983461198885f3ed8f7b2db/setup.py'"'"'; __file__='"'"'/tmp/pip-install-k06h_9aq/mailer_e0ec5902e983461198885f3ed8f7b2db/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-y8q_t3za
         cwd: /tmp/pip-install-k06h_9aq/mailer_e0ec5902e983461198885f3ed8f7b2db/
    Complete output (1 lines):
    error in mailer setup command: use_2to3 is invalid.
    ----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/30/e7/c3a932fc03ab95c96ff911d8ee3e89b937205596a5c1f00849401a2468e0/mailer-0.8.1.zip#sha256=3411a12197731e0d5379ab194d9acc8d0d71c8b95fdfb11474d67c3e9860070e (from https://pypi.org/simple/mailer/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
  Downloading https:// **********/30/e7/c3a932fc03ab95c96ff911d8ee3e89b937205596a5c1f00849401a2468e0/mailer-0.8.1.zip (6.5 kB)
    ERROR: Command errored out with exit status 1:
     command: /home/miguelfito/tmp/pruebas/devops_housekeeping_test/.env/bin/python3 -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-k06h_9aq/mailer_ac6269ca2eb7417faf12a97364828523/setup.py'"'"'; __file__='"'"'/tmp/pip-install-k06h_9aq/mailer_ac6269ca2eb7417faf12a97364828523/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-_1878lem
         cwd: /tmp/pip-install-k06h_9aq/mailer_ac6269ca2eb7417faf12a97364828523/
    Complete output (1 lines):
    error in mailer setup command: use_2to3 is invalid.
    ----------------------------------------
WARNING: Discarding https:// **********/30/e7/c3a932fc03ab95c96ff911d8ee3e89b937205596a5c1f00849401a2468e0/mailer-0.8.1.zip#sha256=3411a12197731e0d5379ab194d9acc8d0d71c8b95fdfb11474d67c3e9860070e (from https://descinet.bbva.es/artifactory/api/pypi/pypi/simple/mailer/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
ERROR: Could not find a version that satisfies the requirement mailer==0.8.1 (from versions: 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8.1)
ERROR: No matching distribution found for mailer==0.8.1

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