抑制python子进程中的输出调用[重复]

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How to just call a command and not get its output [duplicate] 4 answers

如何只是调用一个命令,而不是得到它的输出[重复] 4个答案

For the following command:

对于以下命令:

subprocess.call(shlex.split(
            """/usr/local/itms/bin/iTMSTransporter -m lookupMetadata 
              -apple_id %s -destination %s"""%(self.apple_id, self.destination))

It prints the entire output into the Terminal window. How would I suppress ALL output here? I tried doing subprocess.call(shlex.split(<command> > /dev/null 2&1)), but it didn't produce the required results. How would I do this here?

它将整个输出打印到终端窗口。我如何在这里抑制所有输出?我尝试过subprocess.call(shlex.split(>> / dev / null 2&1)),但它没有产生所需的结果。我怎么会这样做?

2 个解决方案

#1

You can use the stdout= and stderr= parameters to subprocess.call() to direct stdout or stderr to a file descriptor of your choice. So maybe something like this:

您可以使用stdout =和stderr =参数来subprocess.call()将stdout或stderr定向到您选择的文件描述符。也许是这样的:

import os

devnull = open(os.devnull, 'w')
subprocess.call(shlex.split(
    '/usr/local/itms/bin/iTMSTransporter -m lookupMetadata '
    '-apple_id %s -destination %s' % (self,apple_id, self.destination)),
  stdout=devnull, stderr=devnull)

Using subprocess.PIPE, if you're not reading from the pipe, could cause your program to block if it generates a lot of output.

使用subprocess.PIPE,如果你没有从管道中读取,可能会导致程序在生成大量输出时阻塞。

Update

As @yanlend mentions in a comment, newer (3.x) versions of Python include subprocess.DEVNULL to solve this problem in a more convenient and portable fashion. In that case, the code would look like:

正如@yanlend在评论中提到的,较新的(3.x)版本的Python包括subprocess.DEVNULL以更方便和便携的方式解决这个问题。在这种情况下,代码看起来像:

subprocess.call(shlex.split(
    '/usr/local/itms/bin/iTMSTransporter -m lookupMetadata '
    '-apple_id %s -destination %s' % (self,apple_id, self.destination)),
  stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)

#2

What worked for me is appending 2>/dev/null at the end of the command.

对我有用的是在命令末尾附加2> / dev / null。

#1