[Bug 1905064] [NEW] "+" suffix in 3.9.0+ breaks pip

[Cédric Cabessa]

Public bug reported:

python3.9 in focal is versioned as 3.9.0+

According to pip this is considered as a "LegacyVersion", which break
comparison

https://github.com/pypa/pip/blob/20.2.4/src/pip/_vendor/packaging/version.py#L48

Here is a snippet that show the "+" break comparison

```
>>> from pip._vendor.packaging.version import parse
>>> parse("3.9.0+")
<LegacyVersion('3.9.0+')>
>>> parse("3.9.0")
<Version('3.9.0')>
>>> parse("3.9.0+") >= parse("3.6.0")
False
>>> parse("3.9.0") >= parse("3.6.0")
True
>>> 
```

Is it possible to mark this version as 3.9.0 ?
It seems the plus is introduced by a debian patch.

Thank you

** Affects: python3.9 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1905064

Title:
  "+" suffix in 3.9.0+ breaks pip

Status in python3.9 package in Ubuntu:
  New

Bug description:
  python3.9 in focal is versioned as 3.9.0+

  According to pip this is considered as a "LegacyVersion", which break
  comparison

  https://github.com/pypa/pip/blob/20.2.4/src/pip/_vendor/packaging/version.py#L48

  Here is a snippet that show the "+" break comparison

  ```
  >>> from pip._vendor.packaging.version import parse
  >>> parse("3.9.0+")
  <LegacyVersion('3.9.0+')>
  >>> parse("3.9.0")
  <Version('3.9.0')>
  >>> parse("3.9.0+") >= parse("3.6.0")
  False
  >>> parse("3.9.0") >= parse("3.6.0")
  True
  >>> 
  ```

  Is it possible to mark this version as 3.9.0 ?
  It seems the plus is introduced by a debian patch.

  Thank you

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