gistfile1.py

def partial_cls(name, cls, *args, **kwargs):
    def constructor(self, *moreargs, **morekwargs):
        super(self.__class__, self).__init__(
                *(args+moreargs), **dict(kwargs, **morekwargs))
    constructor.__doc__ = cls.__init__.__doc__
    constructor.func_name = cls.__init__.__name__
    dict_ = {"__init__": constructor}
    return type(name, (cls, ), dict_)