RuntimeError: No virtualenv implementation for PythonInfo

[NikelChamp]

Issue

I got this situation when I run the command mkvirtualenv -p python2 env27. But mkvirualenv -p python3 env38 is ok.

Environment

Provide at least:

• OS: MacOS Big Sur 11.6

• pip list of the host python where virtualenv is installed:

   virtualenv                                  20.10.0    
   virtualenv-clone                       0.5.7      
   virtualenvwrapper                    4.8.4 

Output of the virtual environment creation

Make sure to run the creation with -vvv --with-traceback:

  File "/Library/Python/2.7/site-packages/virtualenv/__main__.py", line 18, in run
    session = cli_run(args, options, env)
  File "/Library/Python/2.7/site-packages/virtualenv/run/__init__.py", line 30, in cli_run
    of_session = session_via_cli(args, options, setup_logging, env)
  File "/Library/Python/2.7/site-packages/virtualenv/run/__init__.py", line 48, in session_via_cli
    parser, elements = build_parser(args, options, setup_logging, env)
  File "/Library/Python/2.7/site-packages/virtualenv/run/__init__.py", line 74, in build_parser
    CreatorSelector(interpreter, parser),
  File "/Library/Python/2.7/site-packages/virtualenv/run/plugin/creators.py", line 15, in __init__
    creators, self.key_to_meta, self.describe, self.builtin_key = self.for_interpreter(interpreter)
  File "/Library/Python/2.7/site-packages/virtualenv/run/plugin/creators.py", line 43, in for_interpreter
    raise RuntimeError("No virtualenv implementation for {}".format(interpreter))

[gaborbernat]

The error message seems clear enough for me, the python flavour you're targeting is not supported by virtualenv. See https://virtualenv.pypa.io/en/latest/installation.html#python-and-os-compatibility

[ghost]

Hi @gaborbernat, I'm actually having the same issue on macOS Monterey (12.0.1) on Apple M1.

Traceback (most recent call last):
File "/opt/homebrew/bin/virtualenv", line 8, in
sys.exit(run_with_catch())
File "/opt/homebrew/lib/python3.9/site-packages/virtualenv/main.py", line 65, in run_with_catch
run(args, options, env)
File "/opt/homebrew/lib/python3.9/site-packages/virtualenv/main.py", line 18, in run
session = cli_run(args, options, env)
File "/opt/homebrew/lib/python3.9/site-packages/virtualenv/run/init.py", line 30, in cli_run
of_session = session_via_cli(args, options, setup_logging, env)
File "/opt/homebrew/lib/python3.9/site-packages/virtualenv/run/init.py", line 48, in session_via_cli
parser, elements = build_parser(args, options, setup_logging, env)
File "/opt/homebrew/lib/python3.9/site-packages/virtualenv/run/init.py", line 74, in build_parser
CreatorSelector(interpreter, parser),
File "/opt/homebrew/lib/python3.9/site-packages/virtualenv/run/plugin/creators.py", line 15, in init
creators, self.key_to_meta, self.describe, self.builtin_key = self.for_interpreter(interpreter)
File "/opt/homebrew/lib/python3.9/site-packages/virtualenv/run/plugin/creators.py", line 43, in for_interpreter
raise RuntimeError("No virtualenv implementation for {}".format(interpreter))
RuntimeError: No virtualenv implementation for PythonInfo(spec=CPython2.7.18.final.0-64, system=/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python, exe=/usr/bin/python2, platform=darwin, version='2.7.18 (default, Oct 2 2021, 04:20:38) \n[GCC Apple LLVM 13.0.0 (clang-1300.0.29.1) [+internal-os, ptrauth-isa=deploymen', encoding_fs_io=utf-8-None)

It's seemingly the same issue for me as #1694. Is it something on my side, could be the same bug?

I'm running virtualenv 20.10.0 from /opt/homebrew/lib/python3.9/site-packages/virtualenv/__init__.py

[gaborbernat]

We don't support M1 macOS with python2.7 - see #2233

[ghost]

Oh, thank you Gábor! :)