python - 无法捕获特定错误

我写了这个简单的代码:

#!/usr/bin/python2.7 -tt

import subprocess

def main()
  try:
    process = subprocess.check_output(['unvalidcommand'],shell=True)
  except CalledProcessError:
    print 'there is the calledProcessError'


if __name__ == '__main__':
  main()

预期输出:there is the calledProcessError
我得到了什么:NameError: global name 'CalledProcessError' is not defined

最佳答案

def main():
  try:
    process = subprocess.check_output(['unvalidcommand'],shell=True)
  except subprocess.CalledProcessError: # need to use subprocess.CalledProcessError
    print 'there is the calledProcessError'
main()
there is the calledProcessError
/bin/sh: 1: unvalidcommand: not found

或者只是从subprocess导入您需要的内容:

from subprocess import check_output,CalledProcessError

def main():
  try:
    process = check_output(['unvalidcommand'],shell=True)
  except CalledProcessError:
    print 'there is the calledProcessError'
main()