Method could be a function about python-anti-patterns HOT 2 OPEN

Yeah, the is section is just wrong. "Method could be a function" comes from Pylint, not Python itself, and cls and self are not keywords.

from python-anti-patterns.

1. This section and the section following it ("Method has no argument") present several examples as anti-patterns that are really just logical errors. The user will find out pretty quickly that not including self as an argument means that you can't reference self. We should nuke those examples.

2. The actual anti-pattern here is creating methods that should be functions, like so:

   class Foo:
       def bar(self, a, b):  # should be a function
           return a + b

   def bar(a, b):
       return a + b
   
   class Foo:
       ...

   If it doesn't need the instance (or class in the case of @classmethod), it shouldn't be a method.

3. We should also note that the use of @staticmethod is discouraged. Guido has even pointed out that @staticmethod was a mistake.

from python-anti-patterns.