Python Word List Generator

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#==============MODULES================#
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import itertools

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#==============VARIABLES==============#
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alpha = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890!@#$%^&*()_+-={}|[]\:';,./<>? "

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#==============FUNCTIONS==============#
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#defines algorithm to create words list
def wordlist(alpha):
    for n in itertools.count(1):
        for word in itertools.product(alpha, repeat = n):
            yield ''.join(word)

#creates output file and writes list to file
def buffer_function(filename, alpha, max_words):
    file = open(filename, "w")

    buffer = ""
    buffer = list(itertools.islice(wordlist(alpha), max_words))
    for word in buffer:
        file.write("%s\n" % word)
    print "Word List '%s' Created" % filename

    file.close()
    buffer = ""

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#=============MAIN PROGRAM============#
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def main():
    print "This program generates a word list using a pre-defined alphabet and writes the output to a file."
    print
    print

    max_words = input("Maximum number of words in list: ")
    filename = raw_input("Enter a filename to save the word list as: ") + ".txt"

    buffer_function(filename, alpha, max_words)

main()