blocks|key|722173|text|一定要避免使用os.system()，改用子进程：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|722174|with+open(os.devnull,+'wb')+as+devnull:
++++subprocess.check_call(['/etc/init.d/apache2',+'restart'],+stdout=devnull,+stderr=subprocess.STDOUT)|code-block|syntax|javascript|722175|这是/etc/init.d/apache2+restart+&>+/dev/null的subprocess等效项。|722176|有一个subprocess.DEVNULL+on+Python+3.3%2B|722177|#!/usr/bin/env+python3
from+subprocess+import+DEVNULL,+STDOUT,+check_call

check_call(['/etc/init.d/apache2',+'restart'],+stdout=DEVNULL,+stderr=STDOUT)|722178|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.python.org/3/library/subprocess.html#subprocess.DEVNULL^0|7|B|0|0|2|14|17|A|0|3|I|3|X|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@$9|1A|A|1B|1|1C]]|E|$]]|$1|O|3|P|5|H|7|1D|8|@]|D|@]|E|$I|J]]|$1|Q|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

Avoid <code>os.system()</code> by all means, and use subprocess instead:

<pre><code>with open(os.devnull, 'wb') as devnull:
 subprocess.check_call(['/etc/init.d/apache2', 'restart'], stdout=devnull, stderr=subprocess.STDOUT)
</code></pre>

This is the <code>subprocess</code> equivalent of the <code>/etc/init.d/apache2 restart &amp;&gt; /dev/null</code>.

There is <a href="https://docs.python.org/3/library/subprocess.html#subprocess.DEVNULL" rel="noreferrer"><code>subprocess.DEVNULL</code> on Python 3.3+</a>:

<pre><code>#!/usr/bin/env python3
from subprocess import DEVNULL, STDOUT, check_call

check_call(['/etc/init.d/apache2', 'restart'], stdout=DEVNULL, stderr=STDOUT)
</code></pre>

blocks|key|937872|text|根据您的操作系统(这就是为什么如Noufal所说，您应该改用子进程)，您可以尝试如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|data|937873|+os.system("/etc/init.d/apache+restart+>+/dev/null")|code-block|syntax|javascript|937874|或者(也可以静音错误)|937875|os.system("/etc/init.d/apache+restart+>+/dev/null+2>&1")|937876|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Depending on your OS (and that's why as Noufal said, you should use subprocess instead) you can try something like

<pre><code> os.system("/etc/init.d/apache restart &gt; /dev/null")
</code></pre>

or (to mute also the error)

<pre><code>os.system("/etc/init.d/apache restart &gt; /dev/null 2&gt;&amp;1")
</code></pre>

blocks|key|937806|text|您应该使用subprocess模块，使用它可以以灵活的方式控制stdout和stderr。os.system已弃用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|937807|subprocess模块允许您创建一个表示正在运行的外部进程的对象。你可以从它的stdout/stderr中读取它，写它的stdin，发送信号，终止它等等。模块中的主要对象是Popen。还有许多其他方便的方法，如call等。docs非常全面，并且包含一个section+on+replacing+the+older+functions+(including+os.system)。|937808|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/library/subprocess.html|1|http://docs.python.org/library/subprocess.html#replacing-older-functions-with-the-subprocess-module^0|5|A|V|6|12|6|19|9|0|0|A|2F|5|4Z|9|34|4|0|3J|1Q|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]|$9|1A|A|1B|1|1C]]|E|$]]|$1|H|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]]]

You should use the <code>subprocess</code> module using which you can control the <code>stdout</code> and <code>stderr</code> in a flexible fashion. <code>os.system</code> is deprecated. 

The <code>subprocess</code> module allows you to create an object which represents a running external process. You can read it from it's stdout/stderr, write to it's stdin, send it signals, terminate it etc. The main object in the module is <code>Popen</code>. There are a bunch of other convenience methods like call etc. The <a href="http://docs.python.org/library/subprocess.html">docs</a> are very comprehensive and include a <a href="http://docs.python.org/library/subprocess.html#replacing-older-functions-with-the-subprocess-module">section on replacing the older functions (including <code>os.system</code>)</a>.

blocks|key|937980|text|这是我几年前拼凑的一个系统调用函数，并在各种项目中使用过。如果您根本不想要该命令的任何输出，那么您可以只说out+=+syscmd(command)，然后不对out执行任何操作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|937981|已在Python+2.7.12和3.5.2中测试并工作。|937982|def+syscmd(cmd,+encoding=''):
++++"""
++++Runs+a+command+on+the+system,+waits+for+the+command+to+finish,+and+then
++++returns+the+text+output+of+the+command.+If+the+command+produces+no+text
++++output,+the+command's+return+code+will+be+returned+instead.
++++"""
++++p+=+Popen(cmd,+shell=True,+stdin=PIPE,+stdout=PIPE,+stderr=STDOUT,
++++++++close_fds=True)
++++p.wait()
++++output+=+p.stdout.read()
++++if+len(output)+>+1:
++++++++if+encoding:+return+output.decode(encoding)
++++++++else:+return+output
++++return+p.returncode|code-block|syntax|javascript|937983|entityMap^0|1H|L|27|3|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Here is a system call function I pieced together several years ago and have used in various projects. If you don't want any output from the command at all you can just say <code>out = syscmd(command)</code> and then do nothing with <code>out</code>.

Tested and works in Python 2.7.12 and 3.5.2.

<pre><code>def syscmd(cmd, encoding=''):
 """
 Runs a command on the system, waits for the command to finish, and then
 returns the text output of the command. If the command produces no text
 output, the command's return code will be returned instead.
 """
 p = Popen(cmd, shell=True, stdin=PIPE, stdout=PIPE, stderr=STDOUT,
 close_fds=True)
 p.wait()
 output = p.stdout.read()
 if len(output) &gt; 1:
 if encoding: return output.decode(encoding)
 else: return output
 return p.returncode
</code></pre>

blocks|key|938101|text|我在使用Windows计算机时遇到了类似的问题，我发现这是解决问题的最简单方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|938102|import+subprocess
cmd='gdalwarp+-overwrite+-s_srs+EPSG:4283+-t_srs+EPSG:28350+-of+AAIGrid+XXXXX.tif+XXXXX.asc'
subprocess.run(cmd,shell=True)|code-block|syntax|javascript|938103|将cmd更改为您要运行的任何内容。我重复了这个>+1000次，并且没有出现命令提示符窗口，我能够节省很多时间。|offset|length|style|CODE|938104|entityMap^0|0|0|1|3|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I was having a similar problem using a Windows machine and found this was the easiest way of fixing my problem
<pre><code>import subprocess
cmd='gdalwarp -overwrite -s_srs EPSG:4283 -t_srs EPSG:28350 -of AAIGrid XXXXX.tif XXXXX.asc'
subprocess.run(cmd,shell=True)
</code></pre>
change <code>cmd</code> for whatever you want to run. I iterated this &gt; 1000 times and without the command prompt window appearing, I was able to save a lot of time.

I'm running this:

<pre><code>os.system("/etc/init.d/apache2 restart")
</code></pre>

It restarts the webserver, as it should, and like it would if I had run the command directly from the terminal, it outputs this:

<code>* Restarting web server apache2 ...</code> 
<code>waiting [ OK ]</code>

However, I don't want it to actually output it in my app. How can I disable it?
Thanks!

Python os.system without the output

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在运行这个：os.system("/etc/init.d/apache2 restart")它会重新启动run服务器，就像我直接从终端运行命令一样，输出如下：* Restarting web server apache2                                                 ... waiting                            

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