我使用paramiko创建了一个小python脚本，它允许我运行mapreduce作业，而不使用putty或cmd窗口来启动作业。这很好用，只是在工作完成之前我不能看到stdout。我如何设置它，使我可以看到每一行的标准输出，因为它是生成的，就像我将能够通过命令窗口？
这是我的剧本：

import paramiko
# Define connection info
host_ip = 'xx.xx.xx.xx'
user = 'xxxxxxxxx'
pw = 'xxxxxxxxx'
# Commands
list_dir = "ls /nfs_home/appers/cnielsen -l"
MR = "hadoop jar /opt/cloudera/parcels/CDH/lib/hadoop-0.20-mapreduce/contrib/streaming/hadoop-streaming.jar -files /nfs_home/appers/cnielsen/product_lookups.xml -file /nfs_home/appers/cnielsen/Mapper.py -file /nfs_home/appers/cnielsen/Reducer.py -mapper '/usr/lib/python_2.7.3/bin/python Mapper.py test1' -file /nfs_home/appers/cnielsen/Process.py -reducer '/usr/lib/python_2.7.3/bin/python Reducer.py' -input /nfs_home/appers/extracts/*/*.xml -output /user/loc/output/cnielsen/test51"
getmerge = "hadoop fs -getmerge /user/loc/output/cnielsen/test51 /nfs_home/appers/cnielsen/test_010716_0.txt"
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(host_ip, username=user, password=pw)
## stdin, stdout, stderr = client.exec_command(list_dir)
## stdin, stdout, stderr = client.exec_command(getmerge)
stdin, stdout, stderr = client.exec_command(MR)
print "Executing command..."
for line in stdout:
    print '... ' + line.strip('\n')
for l in stderr:
    print '... ' + l.strip('\n')
client.close()