from https://stackoverflow.com/a/28803868

protect_class.py

def protect(*protected):
    """Returns a metaclass that protects all attributes given as strings"""
    class Protect(type):
        has_base = False
        def __new__(meta, name, bases, attrs):
            if meta.has_base:
                for attribute in attrs:
                    if attribute in protected:
                        raise AttributeError('Overriding of attribute "%s" not allowed.'%attribute)
            meta.has_base = True
            klass = super().__new__(meta, name, bases, attrs)
            return klass
    return Protect

class Parent(metaclass=protect("do_something", "do_something_else")):
    def do_something(self):
        '''This is where some seriously important stuff goes on'''
        pass

class Child(Parent):
    def do_something(self):
        '''This will raise an error during class creation.'''
        pass

c = Child()

c.do_something()