Python: typing, how to use an inner class from another inner class?

Question

Is it possible to specify a parameter of an inner class function as being types as another inner class?

class MyClass():
    
    class InnerClass1():
        pass
        
    class InnerClass2():
        def func(self, param: InnerClass1):
            pass
        
if __name__ == '__main__':
    obj = MyClass()

This reports NameError: name 'InnerClass1' is not defined

Using param: MyClass.InnerClass1 reports NameError: name 'MyClass' is not defined

If this is not possible, what could be the alternative to correctly declare parameter type?

Answer 1

You can refer to the type by string:

class MyClass():
    
    class InnerClass1():

        @property
        def name(self) -> str:
            return "name"
        
    class InnerClass2():
        def func(self, param: "MyClass.InnerClass1"):
            pass
        
if __name__ == '__main__':
    obj = MyClass()

This shows VS Code autocomplete working for param: