create a iterator to process every word in a file. from Python Cookbook!

process_word.py

def words_of_file(thefilepath, line_to_words=str.split)
    the_file = open(thefilepath)
    for line in the_file:
        for word in line_to_words(line):
            yield word
    the_file.close()

for world in worlds_of_file(thefilepath):
    dosomethingwith(word)