New submission from ppperry <[email protected]>:
I was trying to create a class that didn't have any references to itself to
test issue39382 and ran the following code:
class Meta(type):
def mro(cls):
return type.mro(cls)[1:]
class X(metaclass=Meta):
pass
This produced an extremely cryptic error message:
Traceback (most recent call last):
File "<pyshell#89>", line 1, in <module>
class X(metaclass=Meta):
TypeError: super(type, obj): obj must be an instance or subtype of type
While what I am trying to do may well not be supported, the error message
referencing the `super` function, which I didn't use, is not helpful.
----------
components: Build, Interpreter Core
messages: 362152
nosy: ppperry
priority: normal
severity: normal
status: open
title: Cryptic error message when creating types that don't include themselves
in their MRO
type: behavior
versions: Python 3.7, Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue39665>
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