poetry always uses wrong python version

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: macOS mojave
• Poetry version: 1.1.4
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/magnusja/4a3c11b310d5e3a70e7186593310b5d5

Issue

~/D/c/d/backend.service.ocr 🔥🔥 cat .python-version
3.8.6⏎                                                                                                                                      
~/D/c/d/backend.service.ocr 🔥🔥 python --version
Python 3.8.6
~/D/c/d/backend.service.ocr 🔥🔥 pyenv shell 3.8.6  # just to be really sure ..
~/D/c/d/backend.service.ocr 🔥🔥 poetry install
The currently activated Python version 3.9.0 is not supported by the project (3.8.6).
Trying to find and use a compatible version.
Using python3 (3.8.6)
Installing dependencies from lock file

Package operations: 82 installs, 0 updates, 0 removals

    • Installing ipython-genutils (0.2.0): Cancelled
~/D/c/d/backend.service.ocr [1] 🔥🔥 poetry run python --version
The currently activated Python version 3.9.0 is not supported by the project (3.8.6).
Trying to find and use a compatible version.
Using python3 (3.8.6)
Python 3.9.0

[magnusja]

So I couldnt really believe that, and wrote a little test script:

#!/usr/local/opt/python@3.9/bin/python3
import sys
import os

sys.path.insert(0, "/usr/local/Cellar/poetry/1.1.4/libexec/lib/python3.9/site-packages")
sys.path.insert(0, "/usr/local/Cellar/poetry/1.1.4/libexec/vendor/lib/python3.9/site-packages")

if __name__ == "__main__":
    os.system("which python")
    os.system("python --version")

which gives

~/D/c/l/shopfloor (feature/adapt-box-detection|…) 🔥🔥 ./test.py
/Users/magnus/.pyenv/shims/python
Python 3.7.5

so clearly it is possible for poetry to get the correct python env.

Also imho if this is expected behavior you are following an incredibly bad & flawed UX. Basically poetry is telling me it is using python 3.8 and lying to my face instead of throwing an error. It took me quite a while to figure that out …

[magnusja]

~/D/c/l/r/h/training (develop|✚4…) 🔥🔥 pyenv shell 3.8.5
                                                                                                                                   [ 0s053 | Dec 08 05:02PM ]
~/D/c/l/r/h/training (develop|✚4…) 🔥🔥 poetry env use /home/magnus/.pyenv/shims/python
Creating virtualenv training-9MFdeoy7-py3.8 in /home/magnus/.cache/pypoetry/virtualenvs
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'PosixPath' is not defined
Using virtualenv: /usr
                                                                                                                                   [ 0s951 | Dec 08 05:02PM ]
~/D/c/l/r/h/training (develop|✚4…) 🔥🔥 poetry run python
Python 3.9.0 (default, Oct  7 2020, 23:09:01) 
[GCC 10.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 

The env also seems broken