Setting up a main function with command line argument

Let's refine our word fetching module a little further. First, we'll perform a small refactoring and separate the word retrieval and collection on the one hand from the word printing on the other:

from urllib.request import urlopen

# This fetches the words and returns them as a list.
def fetch_words():
    with urlopen('http://sixty-north.com/c/t.txt') as story:
        story_words = []
        for line in story:
            line_words = line.decode('utf-8').split()
            for word in line_words:
                story_words.append(word)
    return story_words


# This prints a list of words
def print_words(story_words):
    for word in story_words:
        print(word)


if __name__ == '__main__':
    words = fetch_words()
    print_words(words)

We do this because it separates two important concerns...