notimplemented-raised.md

Pattern: NotImplemented raised instead of NotImplementedError

Issue: -

Description

NotImplemented is is a built-in constant used to indicate that the comparison is not implemented with respect to the other type. NotImplementedError is an exception used to indicate some module functionality is not implemented.

Example of incorrect code:

def bad_case():
    raise NotImplemented  # [notimplemented-raised]

Example of correct code:

def good_case():
    raise NotImplementedError

Further Reading

• The Python Standard Library - NotImplemented
• The Python Standard Library - NotImplementedError