擅长:python、mysql、java
<p>Python有丰富的标准库,您可以在其中找到许多典型任务的类。<a href="https://docs.python.org/3.5/library/collections.html#collections.Counter" rel="nofollow">Counter</a>是您在当前情况下所需要的:</p>
<pre><code>from collections import Counter
c = Counter()
with open('SchoolPopulation.txt', 'r') as fh:
for line in fh:
name, val = line.split(',')
c[name] += int(val)
print(c)
</code></pre>