擅长:python、mysql、java
<p>使用<a href="https://docs.python.org/2.7/library/collections.html#collections.Counter" rel="nofollow">^{<cd1>}</a>:</p>
<pre><code>def distribution(grades):
available_grades = ['A+','A','A-','B+','B','B-','C+','C','C-','F']
with open(grades, 'r') as fin:
gradeCounts = collections.Counter(fin.readline().split())
for grade in available_grades:
print(gradeCounts[grade], 'students got', grade)
</code></pre>