Incorrect python version checking

• 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: Linux roadwarrior2 5.4.0-3-amd64 #1 SMP Debian 5.4.13-1 (2020-01-19) x86_64 GNU/Linux
• Poetry version: 1.0.5
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/shenek/50cfa373695a917d91ca06873660b965

Issue

I tried to install dependency which uses setuptools and python_requires='>=3.6'. But this seems to be in conflict with python requirement. Of my pyproject.toml.

[tool.poetry.dependencies]
python = "^3.6"

It causes:

poetry update
Updating dependencies
Resolving dependencies... (0.3s)

[SolverProblemError]
The current project's Python requirement (^3.6.0) is not compatible with some of the required packages Python requirement:
  - djangorestframework-simplejwt requires Python >=3.6,<3.9

Because djangorestframework-simplejwt (4.4.0) requires Python >=3.6,<3.9
 and no versions of djangorestframework-simplejwt match >4.4.0,<4.5.0, djangorestframework-simplejwt is forbidden.
So, because permission-service depends on djangorestframework-simplejwt (~4.4.0), version solving failed.
https://gist.github.com/shenek/50cfa373695a917d91ca06873660b965

And I’m using python version 3.7 which should match here.

[shenek]

As a workaround you can:

[tool.poetry.dependencies]
python = ">=3.6,<3.9"

[ZelphirKaltstahl]

Ah OK, I think that I understand it better now. I would like to add, that this behavior is unusual for anyone having used requirements.txt, pipenv or npm before. Which does not need to be a bad thing. Here is a suggestion: Perhaps we could take this as an example and put it in the readme, somewhere more visible, so that people do not come with different expectations and do not hit this problem.