This rule is deprecated; use {rule:python:S5722} instead.

Why is this an issue?

The __exit__ method is invoked with four arguments: self, type, value and traceback. Leave one of these out of the method declaration and the result will be a TypeError at runtime.

Noncompliant code example

class MyClass:
   def __enter__(self):
       pass
   def __exit__(self, exc_type, exc_val):  # Noncompliant
       pass