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with open('a.txt','r') as f:
lines = f.readlines()
amap = {}
bmap = {}
for line in lines:
if line.strip():
key, value = line.strip().split(',',1)
amap[key] = 0
bmap[key] = value
with open('b.txt', 'r') as f:
lines = f.read()
for line in lines.split():
if amap.has_key(line.strip()):
amap[line.strip()] += 1
con = ''
for key in bmap:
line = bmap[key].split(',')
con += ','.join([line[0]+'+'+amap[key],line[1],line[2]])
with open('c.txt', 'w') as f:
f.write(con)