Poetry chooses the wheel package for a different Python version

[jakobkogler]

• 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 5.4.36-1-MANJARO x86_64
• Poetry version: 1.0.5
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/jakobkogler/02dff357fd0b1fa077026ab0cc15eba7

Issue

I'm trying to install the library scrapy-rss.
On Pypi there are multiple different wheels, one for each Python version. Those wheels have actually different dependencies. The wheel scrapy_rss-0.1.9-py38-none-any.whl (for Python 3.8.2) simply has the dependency scrapy>=1.3.1, while the wheel scrapy_rss-0.1.9-py33-none-any.whl has the dependency scrapy<1.5.0.

I'm using Python 3.8.2 inside the poetry virtualenv. If I download the 38 wheel, and manually install it with poetry add ./scrapy_rss-0.1.9-py38-none-any.whl, it will install fine and choose the newest version of scrapy, namely scrapy=2.1.0. However If I just say: poetry add scrapy-rss, it will install the 33 wheel, and demand the scrapy version scrapy=1.4.0.

Why does poetry pick the wrong wheel in this case?

Here's the output of poetry add:

>> poetry add "scrapy-rss" --dry-run -vvv 
Using virtualenv: /home/jakob/.cache/pypoetry/virtualenvs/aab-HyhLZxPz-py3.8
PyPI: No release information found for scrapy-rss-0.1.2, skipping
PyPI: 9 packages found for scrapy-rss *
Using version ^0.1.9 for scrapy-rss

Updating dependencies
Resolving dependencies...
   1: fact: aab is 0.1.0
   1: derived: aab
   1: fact: aab depends on scrapy-rss (^0.1.9)
   1: selecting aab (0.1.0)
   1: derived: scrapy-rss (^0.1.9)
PyPI: No release information found for scrapy-rss-0.1.2, skipping
PyPI: 1 packages found for scrapy-rss >=0.1.9,<0.2.0
   1: fact: scrapy-rss (0.1.9) depends on cryptography (<2.0)
   1: fact: scrapy-rss (0.1.9) depends on pyOpenSSL (<17.3.0)
   1: fact: scrapy-rss (0.1.9) depends on python-dateutil (*)
   1: fact: scrapy-rss (0.1.9) depends on scrapy (<1.5.0)
   1: fact: scrapy-rss (0.1.9) depends on six (*)
   1: selecting scrapy-rss (0.1.9)
...

Btw, pip will choose the correct version. In a new virtualenv, running pip install scrapy-rss will install the 38 wheel. So this must be a bug on the poetry side.

[mikenerone]

Duplicates #2284

[github-actions]

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