pyschools Topic 8: Question 7的题目：给定一个单词，输出字母及字母出现次数
Write a function countLetters(word) that takes in a word as argument and returns a dictionary that counts the number of times each letter appears.
python真是方便，可以一行代码搞定
def countLetters(word):
return dict(sorted([(l,word.count(l)) for l in set(word)]))
print(countLetters('google'))
{'e': 1, 'g': 2, 'l': 1, 'o': 2}
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