Fully cover handling arbitrary equality (===) in Specifier and SpecifierSet. #943

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1. notatallshaw commented on Oct 14, 2025

   

   notatallshaw

   on Oct 14, 2025

   MemberAuthor

   More actions

   Here's are some specific issues:

   === works are expected when filtering against one specifier:

   >>> list(SpecifierSet("===1.0").filter(["1.0"]))
   ['1.0']
   >>> list(SpecifierSet("===1.0").filter(["1.0.0"]))
   []
   >>> list(SpecifierSet("===1.0.0").filter(["1.0"]))
   []
   >>> list(SpecifierSet("===1.0.0").filter(["1.0.0"]))
   ['1.0.0']
   

   But breaks when filtering against two specifiers:

   >>> list(SpecifierSet("===1.0,===1.0.0").filter(["1.0"]))
   ['1.0']
   

   Further, arbitrary versions do not work as per PEP 440:

   >>> list(SpecifierSet("===foo").filter(["foo"]))
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
     File "/home/damian/opensource/contributions/packaging/src/packaging/specifiers.py", line 945, in filter
       if prereleases is None and self.prereleases is not None:
     File "/home/damian/opensource/contributions/packaging/src/packaging/specifiers.py", line 727, in prereleases
       if any(s.prereleases for s in self._specs):
     File "/home/damian/opensource/contributions/packaging/src/packaging/specifiers.py", line 727, in <genexpr>
       if any(s.prereleases for s in self._specs):
     File "/home/damian/opensource/contributions/packaging/src/packaging/specifiers.py", line 265, in prereleases
       if Version(version).is_prerelease:
     File "/home/damian/opensource/contributions/packaging/src/packaging/version.py", line 203, in __init__
       raise InvalidVersion(f"Invalid version: {version!r}")
   packaging.version.InvalidVersion: Invalid version: 'foo'
   
2. brettcannon

   added

   packaging.specifiers

   bug

   on Feb 9, 2026
3. notatallshaw commented on May 17, 2026

   

   notatallshaw

   on May 17, 2026

   MemberAuthor

   More actions

   @Sean-Kenneth-Doherty thanks for the reminder, indeed fully covered this already, including clarifying the standards.
4. notatallshaw

   closed this as completedon May 17, 2026