Base RLE decode – python 3 using generator

def rle_decode(string):

    def split_series(text):

        temp, iterator, number = "", iter(text), ""

        for element in iterator:

            number = ""

            if not element.isdigit():

                temp = element

                element = next(iterator)

                while element.isdigit():

                    number += element

                    element = next(iterator)

                yield (temp, int(number))

                temp = element

            else:

                number = element

                try:

                    element = next(iterator)

                    while element.isdigit():

                        number += element

                        element = next(iterator)

                    yield (temp, int(number))

                except StopIteration:

                    yield (temp, int(number))

                temp = element

    def decode_series(series):

        return ''.join(map(str, [k * i for k, i in series]))

    return decode_series(split_series(string))

print(rle_decode(input()))