def append_original_doc(parent, num=0):
    """Return an iterator that append the docstring of the given `parent`
    function to the applied function"""
    def func(func):
        func.__doc__ = func.__doc__ and func.__doc__ + indent(
            parent.__doc__, num)
        return func
    return func
Return an iterator that append the docstring of the given `parent`
    function to the applied function