python 练习

import os
import sys


last_key=None


result=[]


for line in sys.stdin:
    inputkey,value=line.rstrip("\r\n").split("\t")


    if last_key and last_key != inputkey:
        result.append(last_key)
        print last_key,
        for  index in range(0,len(result)-1):
            print result[index],
        print 
        del result[:]
        result.append(value)
        last_key = inputkey
    else:
        result.append(value) 
        last_key = inputkey
if last_key == inputkey:
    result.append(last_key)
    print last_key,
    for  index in range(0,len(result)-1):
        print result[index],
    print