On 04/11/2019 14:33, Veek M wrote:
Aha. You're trying to fix up the metaclass after the fact, which is not
the right way to do it. If you change the class definitions to:
__metaclass__ = whatever; # is python2.x syntax
But not Python3: see PEP 3115
then you get the prints from MyMeta.__instancecheck__(). The
isinstance() still returns True, though, and I don't know why. Then
again, your definition of MyMeta is really weird.
weird how..?
(I'm just trying to figure out what's going on with __instancecheck__ -
no further higher purpose :p)
example, when we do: isinstance(x, (A, B, C))
you expect from the docs that
A.__instancecheck__(cls, x) is passed but x = []
also, B and C.__instancecheck__ is not called when I return False
Also if I interchange (Bar, Foo), expecting that Foo.__instancecheck__
will be called, it's completely bypassed
That must be what's responsible for the True result. Logically the
problem must be to do with your MyzMeta class then. I have no idea what.
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Rhodri James *-* Kynesim Ltd
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