Class methods should use self as first argument

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Metadata

ID: python-best-practices/class-methods-use-self

Language: Python

Severity: Error

Category: Best Practices

Description

In a class method (that is not a class method nor a static method), the first argument must be self by convention.

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Non-Compliant Code Examples

class Foo:
    def bar(bar):  # use def bar(self) instead
        pass

Compliant Code Examples

class Foo:
    @staticmethod
    def static_method(bar):
        pass

    @classmethod
    def class_method(bar):
        pass

    def __call__(cls, *args, **kwargs):
        pass

class IFoo(Interface): # zope interfaces won't get flagged
    def method(i):
        pass