return parameterized_helper

def to_safe_name(s):

    return re.sub("[^a-zA-Z0-9_]", "", s)

def parameterized_expand_helper(func_name, func, args):

    def parameterized_expand_helper_helper(self=()):

        if self != ():

            self = (self,)

        return func(*(self + args))

    return parameterized_expand_helper_helper

def parameterized_expand(input):

    """ A "brute force" method of parameterizing test cases. Creates new test

        cases and injects them into the namespace that the wrapped function

        is being defined in. Useful for parameterizing tests in subclasses

        of 'UnitTest', where Nose test generators don't work.

        >>> @parameterized.expand([("foo", 1, 2)])

        ... def test_add1(name, input, expected):

        ...     actual = add1(input)