Python code for http://wiki.openhatch.org/Scrabble_challenge

scrabble_cheater.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import argparse
import collections


scores = {"a": 1, "c": 3, "b": 3, "e": 1, "d": 2, "g": 2,
          "f": 4, "i": 1, "h": 4, "k": 5, "j": 8, "m": 3,
          "l": 1, "o": 1, "n": 1, "q": 10, "p": 3, "s": 1,
          "r": 1, "u": 1, "t": 1, "w": 4, "v": 4, "y": 4,
          "x": 8, "z": 10}


def get_word_letter_counter(word):
    """ return a dict of { letter: count } """
    return collections.Counter(word.lower())


def get_word_list_from_file(filename):
    """ return an iterator of (word, word_letter_counter) tuple """
    for line in open(filename):
        word = line.rstrip('\n')
        yield (word, get_word_letter_counter(word))


def get_rack_from_arg():
    """ return a string of rack """
    parser = argparse.ArgumentParser(description='Scrabble cheater')
    parser.add_argument('rack', help='input a rack')
    args = parser.parse_args()
    return args.rack


def get_word_score(word_letter_counter):
    """ return an integer of word score """
    return sum(scores[letter] * count for letter, count in word_letter_counter.items())


if __name__ == '__main__':
    rack = get_rack_from_arg()
    rack_letter_counter = get_word_letter_counter(rack)

    def is_valid_word(word_letter_counter):
        return all(count <= rack_letter_counter.get(letter, 0)
                   for letter, count in word_letter_counter.items())

    valid_words = (
            (get_word_score(word_letter_counter), word)
            for word, word_letter_counter in get_word_list_from_file('sowpods.txt')
            if is_valid_word(word_letter_counter)
            )

    for score, word in sorted(valid_words, reverse=True):
        print(score, word)