我正在尝试运行这个mapper和reducer代码（*免责声明-培训课程解决方案的一部分）
Map器.py

import sys

for line in sys.stdin:
    data = line.strip().split("\t")
    if len(data) == 6:
        date, time, store, item, cost, payment = data
        print "{0}\t{1}".format(1, cost)

异径管.py

import sys

sTotal = 0
trans = 0

for line in sys.stdin:
    data_mapped = line.strip().split("\t")
    if len(data_mapped) != 2:
        continue

    sTotal += float(data_mapped[1])
    trans += 1

print transactions, "\t", salesTotal

不断抛出此错误：

UNDEF/bin/hadoop job  -Dmapred.job.tracker=0.0.0.0:8021 -kill job_201404041914_0012
14/04/04 23:13:53 INFO streaming.StreamJob: Tracking URL: http://0.0.0.0:50030/jobdetails.jsp?jobid=job_201404041914_0012
14/04/04 23:13:53 ERROR streaming.StreamJob: Job not successful. Error: NA
14/04/04 23:13:53 INFO streaming.StreamJob: killJob...
Streaming Command Failed!

我尝试过显式调用python函数，也尝试过指定python解释器(i、 e./usr/bin/env（python）
知道哪里出了问题吗？