E0211
Message
Method has no argument
Description
Used when a method which should have the bound instance as first argument has no argument defined.
This message belongs to the classes checker.
Explanation
The first argument of a method in Python must be the object on which the method is invoked. This object may be the instance of a class or a class. The name of that argument follows certain conventions. See PEP 8: Function and Method Arguments for details.