每当我尝试在hadoop系统中运行reducer-python程序时，就会出现这个错误。不过，mapper程序运行得非常好。已授予与我的Map程序相同的权限。有语法错误吗？
回溯（最近一次调用last）：文件“reducer.py”，第13行，在word中，count=line.split（'\t'，1）valueerror:需要多于1个值才能解包

# !/usr/bin/env python

            import sys

            # maps words to their counts
            word2count = {}

            # input comes from STDIN
            for line in sys.stdin:
                # remove leading and trailing whitespace
                line = line.strip()

                # parse the input we got from mapper.py
                word, count = line.split('\t', 1)
                # convert count (currently a string) to int
                try:
                    count = int(count)
                except ValueError:
                    continue

                try:
                    word2count[word] = word2count[word]+count
                except:
                    word2count[word] = count

            # write the tuples to stdout
            # Note: they are unsorted
            for word in word2count.keys():
                print '%s\t%s'% ( word, word2count[word] )