Inconsistency with pip when handling versions with "+" in their name.

[pkubik]

• OS version and name: Ubuntu 18.04
• Poetry version: 1.0.10

Deps:

torch = "^1.6"
kornia = "^0.4"

Issue

The default behavior is correct. Even if I remove torch dependency it is being installed as a dependency for kornia.

Yet for my server machine I need to use a specific manually installed version of torch which is 1.6.0+cu101. This dependency is already installed on the system and should be reused. pip install properly recognize that the existing version 1.6.0+cu101 matches the requirement ^1.6, but Poetry tries to "upgrade" the package and thus replaces it with a version that does not work in my setup:

- Updating torch (1.6.0+cu101 -> 1.6.0)

Not that I've added kornia library because it depend on torch 1.6. Otherwise I could just remove torch from my requirements and move on with my life. Also note that this specific 1.6.0+cu101 version is not available on PyPI, so I can't simply provide this version in my TOML - besides I wouldn't like to hardcore a version that is needed only by some of my environments.

Edit:
Handling this +something suffixes is backed by PEP-440
https://www.python.org/dev/peps/pep-0440/#id25

[abn]

Relates to #2543

[pkubik]

@abn, yes, this is a duplicate to #2543. Sorry, I didn't have the right keywords when I was creating this issue.

[abn]

@pkubik not a problem. Appreciate you raising the issue. :)

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