It seems to have moved out of the body of the function,
into the class definition. Hit this a couple times...
2to3 . --fix metaclass -wpn
Ref: PEP 3115
https://peps.python.org/pep-3115/
2to3 . --fix dict -wpn
Py2 dict was a list by default, the iterator versions
were switched around to be the default.
This lets you have the old behavior. Mechanical.
Ref: PEP 3106
https://peps.python.org/pep-3106/