文件排序

sort.py

import sys 
lines = []
for line in sys.stdin:
    line = line.rstrip()
    tokens = line.split('\t')
    src, tgt = tokens[0], tokens[1]
    lines.append(((src,tgt), line)) #TODO

lines.sort(key=lambda a:a[0])

for _, line in lines:
    print line