title: Python default metaclasses
body: <p>Is it possible to somehow configure a python module or REPL to use a default metaclass for all classes defined, regardless of whether or not a metaclass is used in the class ?</p>
  
  <pre><code>class met(type):
      def __init__(cls, name, bases, dct):
          super(met, cls).__init__(name, bases, dct)
          setattr(cls, "_test_member", "test_value")
  
  class A(object):
      pass
  
  &gt;&gt;&gt; A._test_member
  'test_value'
  </code></pre>