Christian Heimes added the comment:
Good work! This example is a bit easier to understand:
class Cls:
pass
a = Cls()
a.x = 1
a.y = 2
b = Cls()
b.x = 1
print(hasattr(b, 'y'))
print(b.__dict__.pop('y', None))
$ ./python d.py
False
python: Objects/dictobject.c:1743: _PyDict_Pop: Assertion `ix >= 0' failed.
Aborted (core dumped)
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<http://bugs.python.org/issue28120>
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