擅长:python、mysql、java
<pre><code>school = population = prev = ''
pop_count = 0
with open('SchoolPopulation.txt', 'r') as infile:
for line in infile:
line = line.split(',')
school = line[0]
population = int(line[1])
if school == prev or prev == '':
pop_count += line[1]
else:
pass #do something else here
prev = school
</code></pre>