Question

我正在尝试在Python 2.7中使用Popen执行shell cmds。我可以获取标准输出并打印它，但是只能打印一次。当我尝试再次打印它或将输出变量重新分配给另一个时，它为空白。这是我的代码：

from subprocess import Popen, PIPE

p = Popen(['cd /home/pi/GDRIVE; drive push -quiet -ignore-conflict PiDocs'],shell=True, stdout=PIPE)
output = p.communicate()[0]
print output
if p.returncode != 0:
  print p.returncode
  print "Return code was not equal to 0"
  print output
  print "now reassigning output"
  mailtext = output
  print "print output again"
  print output
  print "mailtext is next"
  print mailtext
else:
  print p.returncode
  print "Return code was equal to 0"

有效命令的结果（PiDocs是正确的文件夹名称）：

 0
 Return code was equal to 0

如果命令无效（将PDocs用作不正确的文件夹名称），则结果：

'/PDocs' aka '/home/pi/GDRIVE/PDocs' doesn't exist locally nor remotely 

8
Return code was not equal to 0

now reassigning output 
print output again

mailtext is next

我将标准打印输出后，它将不会再次打印或分配给mailtext并进行打印。有什么建议吗？

子流程Popen重新分配输出

0 个答案: