Metaclasses Development Tutorials, Guides & Insights

class MyMeta(type):
    def __new__(cls, name, bases, dct):
        print(f"Creating class {name}")
        dct["custom_attribute"] = "Added by MyMeta"
        return super().__new__(cls, name, bases, dct)

class MyClass(metaclass=MyMeta):
    pass

print(MyClass.custom_attribute)  # Output: Added by MyMeta

Metaclasses can ensure that all subclasses meet specific criteria.