Add __name__ to property

[eltoder]

class C:
    @property
    def foo(self):
        return 1

assert C.foo.__name__ == "foo"

It would be very handy if this worked, so properties can be introspected the same way as functions, classmethods, etc. Name can be simply taken from fget the same way this is done for __isabstractmethod__.

Linked PRs

• gh-101860: Expose __name__ on property #101876
• gh-101860: document property.__name__ #123399
• [3.13] gh-101860: document property.__name__ (GH-123399) #123428

[sobolevn]

What about this case?

>>> def getter(o):
...     return 42
... 
>>> class Some:
...    number = property(getter)
... 
>>> Some().number
42

Should it be 'getter'?

[TeamSpen210]

Actually, property already defines __set_name__(), storing the name internally for use in formatting AttributeErrors. That's called during class creation, so it'll be accurate regardless where the callable comes from. All that's needed is for that to be exposed. This was added in #71981, but it was kept private to avoid expanding the API since a need wasn't specified.

[eltoder]

@TeamSpen210 Nice find! I think the API expansion comments were about adding name as an argument to property constructor. Adding __name__ as a read-only attribute for introspection seems very much in the spirit of python.

[JelleZijlstra]

This is a change to a builtin and likely has an impact on some introspection tools, so it should be mentioned in the What's New for 3.13.

[picnixz]

Closing since the feature is now documented in 3.13 and 3.14.