15. Metaclasses Basics

Metaclasses are "classes of classes." They define how classes behave.

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Example

class Meta(type):
    def __new__(mcls, name, bases, attrs):
        attrs["created_by"] = "Meta"
        return super().__new__(mcls, name, bases, attrs)

class MyClass(metaclass=Meta):
    pass

print(MyClass.created_by)

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Wrap-Up

Metaclasses allow customization of class creation.