blocks|key|1168163|text|您可能还想看看subprocess模块，它是为替换整个Python+popen-type调用而构建的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1168164|import+subprocess
output+=+subprocess.check_output("cat+/etc/services",+shell=True)|code-block|syntax|javascript|1168165|它的优点是，在调用命令的方式、连接标准输入/输出/错误流的位置等方面有很大的灵活性。|1168166|entityMap^0|7|A|Y|5|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

You might also want to look at the <code>subprocess</code> module, which was built to replace the whole family of Python <code>popen</code>-type calls.

<pre><code>import subprocess
output = subprocess.check_output("cat /etc/services", shell=True)
</code></pre>

The advantage it has is that there is a ton of flexibility with how you invoke commands, where the standard in/out/error streams are connected, etc.

blocks|key|1168132|text|commands模块是完成此操作的一种相当高级的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1168133|import+commands
status,+output+=+commands.getstatusoutput("cat+/etc/services")|code-block|syntax|javascript|1168134|状态为0，输出为/etc/services的内容。|1168135|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The commands module is a reasonably high-level way to do this:

<pre><code>import commands
status, output = commands.getstatusoutput("cat /etc/services")
</code></pre>

status is 0, output is the contents of /etc/services.

blocks|key|954105|text|对于python+3.5%2B，建议使用run+function+from+the+subprocess+module。这将返回一个CompletedProcess对象，您可以从该对象轻松地获取输出和返回代码。因为您只对输出感兴趣，所以可以像这样编写一个实用程序包装器。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|954106|from+subprocess+import+PIPE,+run

def+out(command):
++++result+=+run(command,+stdout=PIPE,+stderr=PIPE,+universal_newlines=True,+shell=True)
++++return+result.stdout

my_output+=+out("echo+hello+world")
#+Or
my_output+=+out(["echo",+"hello+world"])|code-block|syntax|javascript|954107|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.python.org/3/library/subprocess.html#subprocess.run^0|1S|G|I|13|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

For python 3.5+ it is recommended that you use the <a href="https://docs.python.org/3/library/subprocess.html#subprocess.run" rel="noreferrer">run function from the subprocess module</a>. This returns a <code>CompletedProcess</code> object, from which you can easily obtain the output as well as return code. Since you are only interested in the output, you can write a utility wrapper like this.

<pre><code>from subprocess import PIPE, run

def out(command):
 result = run(command, stdout=PIPE, stderr=PIPE, universal_newlines=True, shell=True)
 return result.stdout

my_output = out("echo hello world")
# Or
my_output = out(["echo", "hello world"])
</code></pre>

blocks|key|953980|text|我知道这个问题已经得到了回答，但我想分享一种可能更好看的方式，通过使用from+x+import+x和函数来调用Popen：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|953981|from+subprocess+import+PIPE,+Popen


def+cmdline(command):
++++process+=+Popen(
++++++++args=command,
++++++++stdout=PIPE,
++++++++shell=True
++++)
++++return+process.communicate()[0]

print+cmdline("cat+/etc/services")
print+cmdline('ls')
print+cmdline('rpm+-qa+%7C+grep+"php"')
print+cmdline('nslookup+google.com')|code-block|syntax|javascript|953982|entityMap^0|Z|F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

I know this has already been answered, but I wanted to share a potentially better looking way to call Popen via the use of <code>from x import x</code> and functions:

<pre><code>from subprocess import PIPE, Popen


def cmdline(command):
 process = Popen(
 args=command,
 stdout=PIPE,
 shell=True
 )
 return process.communicate()[0]

print cmdline("cat /etc/services")
print cmdline('ls')
print cmdline('rpm -qa | grep "php"')
print cmdline('nslookup google.com')
</code></pre>

blocks|key|1168285|text|我使用os.system临时文件执行此操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1168286|import+tempfile,os
def+readcmd(cmd):
++++ftmp+=+tempfile.NamedTemporaryFile(suffix='.out',+prefix='tmp',+delete=False)
++++fpath+=+ftmp.name
++++if+os.name=="nt":
++++++++fpath+=+fpath.replace("/","\\")+#+forwin
++++ftmp.close()
++++os.system(cmd+%2B+"+>+"+%2B+fpath)
++++data+=+""
++++with+open(fpath,+'r')+as+file:
++++++++data+=+file.read()
++++++++file.close()
++++os.remove(fpath)
++++return+data|code-block|syntax|javascript|1168287|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

i do it with os.system temp file:

<pre><code>import tempfile,os
def readcmd(cmd):
 ftmp = tempfile.NamedTemporaryFile(suffix='.out', prefix='tmp', delete=False)
 fpath = ftmp.name
 if os.name=="nt":
 fpath = fpath.replace("/","\\") # forwin
 ftmp.close()
 os.system(cmd + " &gt; " + fpath)
 data = ""
 with open(fpath, 'r') as file:
 data = file.read()
 file.close()
 os.remove(fpath)
 return data
</code></pre>

blocks|key|1168367|text|Python2.6和3特别指出要避免对stdout和stderr使用管道。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1168368|正确的方法是|1168369|import+subprocess

#+must+create+a+file+object+to+store+the+output.+Here+we+are+getting
#+the+ssid+we+are+connected+to
outfile+=+open('/tmp/ssid',+'w');
status+=+subprocess.Popen(["iwgetid"],+bufsize=0,+stdout=outfile)
outfile.close()

#+now+operate+on+the+file|code-block|syntax|javascript|1168370|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Python 2.6 and 3 specifically say to avoid using PIPE for stdout and stderr.

The correct way is 

<pre><code>import subprocess

# must create a file object to store the output. Here we are getting
# the ssid we are connected to
outfile = open('/tmp/ssid', 'w');
status = subprocess.Popen(["iwgetid"], bufsize=0, stdout=outfile)
outfile.close()

# now operate on the file
</code></pre>

blocks|key|954174|text|from+os+import+system,+remove
from+uuid+import+uuid4

def+bash_(shell_command:+str)+->+tuple:
++++"""

++++:param+shell_command:+your+shell+command
++++:return:+(+1+%7C+0,+stdout)
++++"""

++++logfile:+str+=+'/tmp/%25s'+%25+uuid4().hex
++++err:+int+=+system('%25s+&>+%25s'+%25+(shell_command,+logfile))
++++out:+str+=+open(logfile,+'r').read()
++++remove(logfile)
++++return+err,+out

#+Example:+
print(bash_('cat+/usr/bin/vi+%7C+wc+-l'))
>>>+(0,+'3296\n')```|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|954175|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre class="lang-py prettyprint-override"><code>from os import system, remove
from uuid import uuid4

def bash_(shell_command: str) -&gt; tuple:
 &quot;&quot;&quot;

 :param shell_command: your shell command
 :return: ( 1 | 0, stdout)
 &quot;&quot;&quot;

 logfile: str = '/tmp/%s' % uuid4().hex
 err: int = system('%s &amp;&gt; %s' % (shell_command, logfile))
 out: str = open(logfile, 'r').read()
 remove(logfile)
 return err, out

# Example: 
print(bash_('cat /usr/bin/vi | wc -l'))
&gt;&gt;&gt; (0, '3296\n')```
</code></pre>

I want to assign the output of a command I run using <code>os.system</code> to a variable and prevent it from being output to the screen. But, in the below code ,the output is sent to the screen and the value printed for <code>var</code> is 0, which I guess signifies whether the command ran successfully or not. Is there any way to assign the command output to the variable and also stop it from being displayed on the screen?

<pre><code>var = os.system("cat /etc/services")
print var #Prints 0
</code></pre>

Assign output of os.system to a variable and prevent it from being displayed on the screen

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。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我想将我使用os.system运行的命令的输出赋给一个变量，并防止它被输出到屏幕上。但是，在下面的代码中，输出被发送到屏幕，并且为var打印的值是0，我猜这表示命令是否成功运行。有没有办法将命令输出赋值给变量，并阻止它在屏幕上显示？var = os.system("cat /etc/services")print var #Prints 0

问将os.system的输出赋值给一个变量，并防止它显示在屏幕上
EN

回答 7

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问将os.system的输出赋值给一个变量，并防止它显示在屏幕上EN

回答 7

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问将os.system的输出赋值给一个变量，并防止它显示在屏幕上
EN