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>>> Tester = type('Tester', (object, ), {})
>>> foo = Tester()
>>> foo.__class__
<class '__main__.Tester'>
>>> foo.__class__ = 'SomeOther'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: __class__ must be set to new-style class, not 'str' object
>>> Bar = type('Bar', (object, ), {})
>>> foo.__class__ = Bar
>>> Bar = type('Bar', (object, ), {'some': 'other'})
>>> foo.some
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'Bar' object has no attribute 'some'
>>> foo.__class__ = Bar
>>> foo.some
'other