Poetry using wrong Python version

Question

Trying to install packages using poetry And getting :

Current Python version (3.10.4) is not allowed by the project (>=3.8,<3.10).

Then I'm trying to do:

poetry env use python3.8

Or

poetry env use 3.8

And the same error popping. Any reason this could happen?

Answer 1

Make sure that when you are switching python version you are using a full path, so poetry has no problem with resolving the version:

poetry env use /usr/bin/python3.8

If that didn't help, check your pyproject.toml and make sure that the version of python is compatible, something like:

python = "^3.8"

If that's not the case try setting up global version:

pyenv global 3.8.15

Also, make sure that all the utility tools are compatible with expected python version:

sudo apt-get install python3.8-distutils
apt install build-essential libssl-dev libffi-dev python3-dev -y

Answer 2

I would advice to try upgrading the poetry, they have bugs from time to time.

I had a similar problem with poetry 2.1.2 version on Mac (poetry installed "globally" via brew). Then I tried to switch the current default python3 (linked to 3.11) it gave an error:

$ poetry env use /opt/homebrew/bin/python3.12

Current Python version (3.11.6) is not allowed by the project (^3.12).
Please change python executable via the "env use" command.

Then I had upgraded the poetry to 2.1.4:

$ brew upgrade poetry
...

$ poetry --version
Poetry (version 2.1.4)

It worked fine:

$ poetry env use /opt/homebrew/bin/python3.12
Using virtualenv: /Users/.../Library/Caches/pypoetry/virtualenvs/...-6xh79vL2-py3.12