Not understood error with __set_name__ in a descriptor class
Peter Otten
__peter__ at web.de
Sun Apr 19 12:38:04 EDT 2020
Unknown wrote:
> Le 19/04/2020 à 17:06, ast a écrit :
>
> I understood where the problem is.
>
> Once __get__ is defined, it is used to read self._name in method
> __set_name__ and it is not défined yet. That's why I have
> an error "'NoneType' object is not callable"
> Thats a nice bug.
It's the fget attribute that is None. You can verify that by setting it to
something else:
class my_property:
def __init__(self, fget=None, fset=None, fdel=None):
self.fget = "fget"
...
> I need to think for a workaround
__get__() usually returns self if it's called on the class:
def __get__(self, instance, owner):
if instance is None:
return self
...
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