pythonpython-typing

How can I use type hints to declare an instance method of a class accepts another class instance as a parameter?

How can I write a class in Python that has a method with an argument that should be an instance of the class?

class MyClass:
    def compare(self, other: MyClass):
        pass

This gives me an error:

NameError: name 'MyClass' is not defined
Solution

  • Try using annotations package, described here.

    Change your code to the following:

    from __future__ import annotations

class MyClass:
    def compare(self, other: MyClass):
        pass

    Also, there is a helpful tutorial here.