def word_score(word):
    """ (str) -> int

    Return the point value the word earns.

    Word length: < 3: 0 points
                 3-6: 1 point per character for all characters in word
                 7-9: 2 points per character for all characters in word
                 10+: 3 points per character for all characters in word

    >>> word_score('DRUDGERY')
    16
    """
    if len(word) < 3:
        return 0
    elif len(word) <7:
        return 1
    elif len(word) < 10:
        return 2
    else:
        return 3