virtualenv==20.0.34 not compatible with python on windows

[drewgilliam]

Actual Behavior

virtualenv v20.0.34 fails on windows with anaconda python. virtualenv v20.0.34 introduced a requirement that python have the file <PYTHON_DIR>/Lib/venv/scripts/nt/python.exe. Anaconda python packages do not have this file.

Traceback

FileNotFoundError: [Errno 2] No such file or directory: 'C:\\<redacted>\\python-3.7.9\\Lib\\venv\\scripts\\nt\\python.exe'

Related issue

#10822

Virtualenv PRs that introduced the issue

pypa/virtualenv#1976
pypa/virtualenv#1977

Virtualenv line throwing error

https://github.com/gaborbernat/virtualenv/blob/main/src/virtualenv/create/via_global_ref/builtin/cpython/cpython3.py#L71

Expected Behavior

anaconda python & virtualenv==20.0.34 should be compatible.

Steps to Reproduce

On windows, create a conda environment with python and virtualenv==20.0.34, then try to create a virtualenv

conda create -n foo python virtualenv==20.0.34
conda activate foo
virtualenv ./bar

Anaconda or Miniconda version:

64-bit Miniconda3
https://repo.anaconda.com/miniconda/Miniconda3-latest-Windows-x86_64.exe
1f4ff67f051c815b6008f144fdc4c3092af2805301d248b56281c36c1f4333e5

Operating System:

Windows 10 64-bit

conda info

     active environment : None
       user config file : C:\Users\drew\.condarc
 populated config files :
          conda version : 4.8.3
    conda-build version : not installed
         python version : 3.8.2.final.0
       virtual packages :
       base environment : C:\Users\drew\AppData\Local\Temp\_MEI454682  (read only)
           channel URLs : https://repo.anaconda.com/pkgs/main/win-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/win-64
                          https://repo.anaconda.com/pkgs/r/noarch
                          https://repo.anaconda.com/pkgs/msys2/win-64
                          https://repo.anaconda.com/pkgs/msys2/noarch
          package cache : C:\Users\drew\AppData\Local\Temp\_MEI454682\pkgs
                          C:\Users\drew\.conda\pkgs
                          C:\Users\drew\AppData\Local\conda\conda\pkgs
       envs directories : C:\Users\drew\.conda\envs
                          C:\Users\drew\AppData\Local\Temp\_MEI454682\envs
                          C:\Users\drew\AppData\Local\conda\conda\envs
               platform : win-64
             user-agent : conda/4.8.3 requests/2.23.0 CPython/3.8.2 Windows/10 Windows/10.0.18362
          administrator : False
             netrc file : None
           offline mode : False

conda list --show-channel-urls

# packages in environment at C:\<redacted>\python-3.7.9:
#
# Name                    Version                   Build  Channel
appdirs                   1.4.4                      py_0    defaults
brotlipy                  0.7.0           py37he774522_1000    defaults
ca-certificates           2020.10.14                    0    defaults
certifi                   2020.6.20                py37_0    defaults
cffi                      1.14.3           py37h7a1dbc1_0    defaults
chardet                   3.0.4                 py37_1003    defaults
cryptography              3.1.1            py37h7a1dbc1_0    defaults
distlib                   0.3.1                    py37_0    defaults
filelock                  3.0.12                     py_0    defaults
idna                      2.10                       py_0    defaults
importlib-metadata        2.0.0                      py_1    defaults
openssl                   1.1.1h               he774522_0    defaults
pip                       20.2.3                   py37_0    defaults
pycparser                 2.20                       py_2    defaults
pyopenssl                 19.1.0                     py_1    defaults
pysocks                   1.7.1                    py37_1    defaults
python                    3.7.9                h60c2a47_0    defaults
requests                  2.24.0                     py_0    defaults
setuptools                50.3.0           py37h9490d1a_1    defaults
six                       1.15.0                     py_0    defaults
sqlite                    3.33.0               h2a8f88b_0    defaults
urllib3                   1.25.10                    py_0    defaults
vc                        14.1                 h0510ff6_4    defaults
virtualenv                20.0.34                  py37_0    defaults
vs2015_runtime            14.16.27012          hf0eaf9b_3    defaults
wheel                     0.35.1                     py_0    defaults
win_inet_pton             1.1.0                    py37_0    defaults
wincertstore              0.2                      py37_0    defaults
zipp                      3.3.0                      py_0    defaults
zlib                      1.2.11               h62dcd97_4    defaults

[PhilReinhold]

I also ran into this, since it breaks pre-commit. I can confirm that downgrading to virtualenv=20.0.33 removes the issue.

[jphme]

ran into the same issue, see my post here:

_Originally posted by @jpdus in #10822 (comment)

[drewgilliam]

virtualenv issue to officially support conda due to this problem.
pypa/virtualenv#1986

[gaborbernat]

Does anyone know why conda does not follow CPython on the venv creation? Why is custom patched?

[whg517]

Does anybody know what's going on with this question? I used 'Pipenv' in my development, which relies on 'Virtualenv', and now I can't use it properly in my new environment, which annoys me.

[bharath5673]

I also ran into this, since it breaks pre-commit. I can confirm that downgrading to virtualenv=20.0.33 removes the issue.

tysm... i was facing the same issue while installing ESP-IDF on windows 10... downgraing venv got fixd ))

[dmyersturnbull]

FYI: Starting tomorrow, Conda will be broken on Windows for every maintained version of Python. (This will hold true for any virtualenv released in the last 3 years.)