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__getattr__ support for metaclass #3840
Description
from six import add_metaclass
class MetaFoo(type):
SOME_DICT = {
'asdf': 'bbbb',
}
def __getattr__(cls, attr):
# type: (str) -> str
return MetaFoo.SOME_DICT[attr]
@add_metaclass(MetaFoo)
class Foo(object):
pass
print(Foo.asdf) # error: Type[Foo] has no attribute "asdf"
So not sure if this is supposed to be supported or the usage pattern should be dis-encouraged anyways ><
Activity
ilevkivskyi commentedon Aug 18, 2017
This is not very high priority, but on the other hand this should be easy to implement. If you want to make a PR, then please take a look at
checkmember.analyze_class_attribute_access(you can see how to make special treatment of__getattr__etc. incheckmember.analyze_member_var_access)elazarg commentedon Aug 18, 2017
It's unrelated to member access in metaclasses. mypy simply does not understand
add_metaclass. It works fine with standard metaclasses, and on the other handfails too.
elazarg commentedon Aug 18, 2017
So this is duplicate of #3365.
ilevkivskyi commentedon Aug 18, 2017
OK, then I am closing this as a duplicate.
elazarg commentedon Aug 18, 2017
@yuyangguo42 you may want to try #3842.