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Accessing property through a Union doesn't work #14439
Description
Activity
Technically I'd want
AandBto have a parent type with the properties in it, but that also doesn't work, because despiteSingleValuePropertybeing a read-write/str property, I can't declareprop: strin the parent class, hence the union at the moment.The parent base class turns out to be irrelevant, but the error doesn't change.
This is still an issue in 1.7.1
Reacted by Chris PetersonThis is still an issue in 1.8.0
I've reduced the example further to avoid the dictionary and stuff in https://mypy-play.net/?mypy=master&python=3.12&gist=d8cfb3e1a6529102f01ead3c3099a1ae to make validation easier. Note that a fix for that may not be a fix for the original version because that doesn't actually access anything in B.
(edit 1: link updated)
This now works correctly (i.e. without any errors).
Bug Report
Accessing a property typed to the object we access , e.g. a property defining
__get__(self, obj: B, ...)through aUnion[A,B]complains that the argument to__get__has union type, despite being defined in B.To Reproduce
https://mypy-play.net/?mypy=latest&python=3.11&gist=e7d68cb2fa9867b0c21c66f7b33637e5
Expected Behavior
No errors
Actual Behavior
Your Environment
The mypy playground.
mypy.ini(and other config files):