Python Metaclass : Understanding the 'with_metaclass()'

Question

I want to ask what the with_metaclass() call means in the definition of a class.

E.g.:

class Foo(with_metaclass(Cls1, Cls2)):
         


        

Answer 1

UPDATE: the six.with_metaclass() function has since been patched with a decorator variant, i.e. @six.add_metaclass(). This update fixes some mro issues related to the base objects. The new decorator would be applied as follows:

import six

@six.add_metaclass(Meta)
class MyClass(Base):
    pass

Here are the patch notes and here is a similar, detailed example and explanation for using a decorator alternative.