Define Python version inside project

Question

Many times I work on other developers' projects. I need to detect the Python version they used and sometimes it is hard to find.

I want to define which interpreter version I am using inside my project so that future developers will know which one to use.

Is there any standard (acceptable) way to do it, is it README.md?

Answer 1

pyenv has the .python-version file which can be created with:

pyenv local 3.8.0

The file simply contains the string 3.8.0. Users can then enable that specific python version with:

pyenv local

In Python Poetry you can add to your pyproject.toml:

[tool.poetry.dependencies]
python = "~2.7 || ^3.2"  # Compatible python versions must be declared here