字典的应用(根据第一列,统计第二列之和)

#-*- coding:utf-8 -*-
#根据第一列，统计和

'''
cat info.txt 

lisa,99
bart,80
lisa,100
bart,89
tom,87

'''

d={}
with open('info.txt') as f:
    for line in f:
        line=line.strip().split(',')
        if line[0] in d:
            d[line[0]]+=int(line[1])
        else:
            d[line[0]]=int(line[1])
            
for k,v in d.items():
    print k,v