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What also worries me is the difference between the "class" statement and the type() function.
class M_A(type):
 def __new__(mcls, name, bases, ns):
 print('M_A.__new__', mcls, name, bases)
 return super().__new__(mcls, name, bases, ns)
class M_B(M_A):
 def __new__(mcls, name, bases, ns):
 print('M_B.__new__', mcls, name, bases)
 return super().__new__(mcls, name, bases, ns)
class A(metaclass=M_A): pass
class B(metaclass=M_B): pass
class C(A, B): pass
D = type('D', (A, B), {})
The construction of C and D won't print the same messages.