words.py

#!/usr/bin/env python
""" Retrieve and print words from a URL.

Usage:

    python3 words.py<URL>
"""

import sys
from urllib import request


def fetch_words(url):
    """Fetch a list of words from a URL.

    Args:
        url: The URL of a UTF-8 text document.

    Returns:
        A list of string containing the words from the document.
    """
    story = request.urlopen(url)
    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


def print_items(items):
    """ Print items one per line.

    Args:
        An iterable series of printable items.
    """
    for item in items:
        print(item)


def main(url):
    """ Print each word from a text document from a URL.

    Args:
        url:  The URL of a UTF-8 text document.
    """
    words = fetch_words(url)
    print_items(words)


if __name__ == '__main__':
    main(sys.argv[1])  # The 0th argument is the module filename