Python:“subprocess.Popen”检查成功和错误

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我想检查子进程是否成功执行或失败.目前我已经提出了一个解决方案,但我不知道它是否正确可靠.是否保证每个进程只将st错误输出到stdout:
注意:我不想仅仅重定向/打印输出.我已经知道了怎么办
pipe = subprocess.Popen(command,stdout=subprocess.PIPE,stderr=subprocess.PIPE,universal_newlines=True)

if "" == pipe.stdout.readline():
    print("Success")
    self.isCommandExectutionSuccessful = True

if not "" == pipe.stderr.readline():
    print("Error")
    self.isCommandExectutionSuccessful = True

或者:

if "" == pipe.stdout.readline():
       print("Success")
       self.isCommandExectutionSuccessful = True
   else:
       print("Error")
       self.isCommandExectutionSuccessful = False

和:

if not "" == pipe.stderr.readline():
       print("Success")
       self.isCommandExectutionSuccessful = True
   else:
       print("Error")
       self.isCommandExectutionSuccessful = False

解决方法

你需要对进程的输出做任何事情吗?

check_call方法在这里可能是有用的.看到这里的python docs:https://docs.python.org/2/library/subprocess.html#subprocess.check_call

然后,您可以使用以下内容

try:
  subprocess.check_call(command)
except subprocess.CalledProcessError:
  # There was an error - command exited with non-zero code

然而,这依赖于命令返回0的退出代码,用于成功完成,并且返回错误的非零值.

如果还需要捕获输出,那么check_output方法可能更合适.如果需要,也可以重定向标准错误.

try:
  proc = subprocess.check_output(command,stderr=subprocess.STDOUT)
  # do something with output
except subprocess.CalledProcessError:
  # There was an error - command exited with non-zero code

请参阅这里的文档:https://docs.python.org/2/library/subprocess.html#subprocess.check_output

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