How to determine if a specifier set is empty? (Possible feature request)

[notatallshaw]

This is a feature request / support question I guess.

I am writing a big resolution optimization for Pip that requires understanding if a specifier set is empty, am I correect in assuming the only way to do that at the moment is: str(SpecifierSet()) == ""?

And then if so, my feature request would be to support a __bool__ that is True when the SpecifierSet is not empty and is False when the SpecifierSet is empty. This would save on the sorted call that __str__ makes. Would you be willing to take a PR on this?

[pradyunsg]

You can do this with len(s) == 0 and it should be relatively cheap. I'm wary of defining __bool__ since it's possible that folks depend on the value being truthy.

packaging/src/packaging/specifiers.py

Line 861 in 7698237

def __len__(self) -> int:

[notatallshaw]

Ah, perfect thanks!