Is this mistake in utils.functional?

[Akira Furude]

Currently I'm working on my website, and has debugging it for a while.

Using breakpoint() function I found bug/mistake/missed error in django/utils/functional.py cached_property.__get__(), line 48.

That line contains this: res = instance.__dict__[self.name] = self.func(instance).

May be I don't understand a lot in Python, but I think between instance.__dict__[self.name] and self.func(instance) should be check for equality (==) statement.

That version also proving Python interpreter itself, if you type in terminal this: print(instance.__dict__[self.name] = self.func(instance)).

Has attached the screenshot to proof the error.

[Tim Graham]

The code is equivalent to:

res = self.func(instance)

instance.__dict__['self.name'] = self.func(instance)

(except that self.func(instance) isn't called twice like it would be in this version)