gistfile1.py

import string


def product(*vectors):
    if len(vectors) == 0:
        yield ()
    else:
        for element in vectors[0]:
            for tail in product(*vectors[1:]):
                yield tuple(element) + tail
                

def generate_strings():
    current_length = 0
    while True:
        current_length += 1
        for element in product(*[string.ascii_lowercase] * current_length):
            yield "".join(element)