2to3 . --fix except -wpn
Python 3 exception syntax is different. Comma-based syntax is gone,
much like print syntax is changed.
This lets you have the old behavior. Mechanical.
Ref: PEP 3110
https://peps.python.org/pep-3110/
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/