Resolving metaclass conflicts

Question

I need to create a class that uses a different base class depending on some condition. With some classes I get the infamous:

TypeError: metaclass conflict: t         


        

Answer 1

I like doing:

class mBase1(type):
    ...

class mBase2(type):
    ...

class Base1(metaclass=mBase1):
    ...

class Base2(metaclass=mBase2):
    ...

class mChild(type(Base1), type(Base2)):
    pass

class Child(Base1, Base2, metaclass=mChild):
    ...

That way if something changes with the metaclass of the bases you don't have to worry about it. type() will take care of it.