blocks|key|60889|text|在参数列表中，每个条目必须是独立的。使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|60890|output+=+subprocess.check_output(["ping",+"-c","2",+"-W","2",+"1.1.1.1"])|code-block|syntax|javascript|60891|应该能解决你的问题。|60892|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|$]]

In the list of arguments, each entry must be on its own. Using

<pre><code>output = subprocess.check_output(["ping", "-c","2", "-W","2", "1.1.1.1"])
</code></pre>

should fix your problem.

blocks|key|1970199|text|根据Python+os模块文档的说法，从Python2.6开始，os.popen就被废弃了。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1970200|我认为现代Python的解决方案是从子流程模块中使用check_output()。|1970201|来自子进程Python文档|1970202|subprocess.check_output(args，*，stdin=None，stderr=None，shell=False，universal_newlines=False)运行带有参数的命令，并以字节字符串的形式返回其输出。
如果返回代码为非零，则会引发CalledProcessError。CalledProcessError对象将在返回代码属性中有返回代码，在输出属性中有任何输出。|blockquote|1970203|如果您在Python2.7(或更高版本)中运行以下代码：|1970204|import+subprocess

try:
++++print+subprocess.check_output(["ping",+"-n",+"2",+"-w",+"2",+"1.1.1.1"])
except+subprocess.CalledProcessError,+e:
++++print+"Ping+stdout+output:\n",+e.output|code-block|syntax|javascript|1970205|您应该会看到如下所示的输出：|1970206|Ping+stdout+output:

Pinging+1.1.1.1+with+32+bytes+of+data:
Request+timed+out.
Request+timed+out.

Ping+statistics+for+1.1.1.1:
Packets:+Sent+=+2,+Received+=+0,+Lost+=+2+(100%25+loss),|1970207|可以解析e.output字符串以满足操作需要。|1970208|如果您想要返回代码或其他属性，它们在CalledProccessError中，这可以通过使用pdb来看到。|1970209|(Pdb)!dir(e)+++

['__class__',+'__delattr__',+'__dict__',+'__doc__',+'__format__',
+'__getattribute__',+'__getitem__',+'__getslice__',+'__hash__',+'__init__',
+'__module__',+'__new__',+'__reduce__',+'__reduce_ex__',+'__repr__',
+'__setattr__',+'__setstate__',+'__sizeof__',+'__str__',+'__subclasshook__',+
+'__unicode__',+'__weakref__',+'args',+'cmd',+'message',+'output',+'returncode']|1970210|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/library/os.html#os.popen|1|http://docs.python.org/library/subprocess.html^0|2|D|0|0|0|2|B|1|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@$A|1C|B|1D|1|1E]]|C|$]]|$1|D|3|E|5|6|7|1F|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|1G|8|@]|9|@$A|1H|B|1I|1|1J]]|C|$]]|$1|H|3|I|5|J|7|1K|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1L|8|@]|9|@]|C|$]]|$1|M|3|N|5|O|7|1M|8|@]|9|@]|C|$P|Q]]|$1|R|3|S|5|6|7|1N|8|@]|9|@]|C|$]]|$1|T|3|U|5|O|7|1O|8|@]|9|@]|C|$P|Q]]|$1|V|3|W|5|6|7|1P|8|@]|9|@]|C|$]]|$1|X|3|Y|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|Z|3|10|5|O|7|1R|8|@]|9|@]|C|$P|Q]]|$1|11|3|-4|5|6|7|1S|8|@]|9|@]|C|$]]]|12|$13|$5|14|15|16|C|$17|18]]|19|$5|14|15|16|C|$17|1A]]]]

According to the <a href="http://docs.python.org/library/os.html#os.popen">Python os module documentation</a> os.popen has been deprecated since Python 2.6.

I think the solution for modern Python is to use check_output() from the subprocess module.

From the <a href="http://docs.python.org/library/subprocess.html">subprocess Python documentation</a>:

<blockquote>
 subprocess.check_output(args, *, stdin=None, stderr=None, shell=False, universal_newlines=False)
 Run command with arguments and return its output as a byte string.
 
 If the return code was non-zero it raises a CalledProcessError. The CalledProcessError object will have the return code in the returncode attribute and any output in the output attribute.
</blockquote>

If you run through the following code in Python 2.7 (or later):

<pre><code>import subprocess

try:
 print subprocess.check_output(["ping", "-n", "2", "-w", "2", "1.1.1.1"])
except subprocess.CalledProcessError, e:
 print "Ping stdout output:\n", e.output
</code></pre>

You should see an output that looks something like this:

<pre><code>Ping stdout output:

Pinging 1.1.1.1 with 32 bytes of data:
Request timed out.
Request timed out.

Ping statistics for 1.1.1.1:
Packets: Sent = 2, Received = 0, Lost = 2 (100% loss),
</code></pre>

The e.output string can be parsed to suit the OPs needs. 

If you want the returncode or other attributes, they are in CalledProccessError as can be seen by stepping through with pdb

<pre><code>(Pdb)!dir(e) 

['__class__', '__delattr__', '__dict__', '__doc__', '__format__',
 '__getattribute__', '__getitem__', '__getslice__', '__hash__', '__init__',
 '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__',
 '__setattr__', '__setstate__', '__sizeof__', '__str__', '__subclasshook__', 
 '__unicode__', '__weakref__', 'args', 'cmd', 'message', 'output', 'returncode']
</code></pre>

blocks|key|60935|text|Thanx+@krd，我正在使用您的错误捕获过程，但必须更新打印和but语句。我在LinuxMint17.2上使用Python2.7.6。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|60936|此外，还不清楚输出字符串来自何处。我的最新消息：|60937|import+subprocess

#+Output+returned+in+error+handler
try:
++++print("Ping+stdout+output+on+success:\n"+%2B+
+++++++++++subprocess.check_output(["ping",+"-c",+"2",+"-w",+"2",+"1.1.1.1"]))
except+subprocess.CalledProcessError+as+e:
++++print("Ping+stdout+output+on+error:\n"+%2B+e.output)

#+Output+returned+normally
try:
++++print("Ping+stdout+output+on+success:\n"+%2B+
+++++++++++subprocess.check_output(["ping",+"-c",+"2",+"-w",+"2",+"8.8.8.8"]))
except+subprocess.CalledProcessError+as+e:
++++print("Ping+stdout+output+on+error:\n"+%2B+e.output)|code-block|syntax|javascript|60938|我看到这样的输出：|60939|Ping+stdout+output+on+error:
PING+1.1.1.1+(1.1.1.1)+56(84)+bytes+of+data.

---+1.1.1.1+ping+statistics+---
2+packets+transmitted,+0+received,+100%25+packet+loss,+time+1007ms


Ping+stdout+output+on+success:
PING+8.8.8.8+(8.8.8.8)+56(84)+bytes+of+data.
64+bytes+from+8.8.8.8:+icmp_seq=1+ttl=59+time=37.8+ms
64+bytes+from+8.8.8.8:+icmp_seq=2+ttl=59+time=38.8+ms

---+8.8.8.8+ping+statistics+---
2+packets+transmitted,+2+received,+0%25+packet+loss,+time+1001ms
rtt+min/avg/max/mdev+=+37.840/38.321/38.802/0.481+ms|60940|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Thanx @krd, I am using your error catch process, but had to update the print and except statements. I am using Python 2.7.6 on Linux Mint 17.2.

Also, it was unclear where the output string was coming from.
My update:

<pre><code>import subprocess

# Output returned in error handler
try:
 print("Ping stdout output on success:\n" + 
 subprocess.check_output(["ping", "-c", "2", "-w", "2", "1.1.1.1"]))
except subprocess.CalledProcessError as e:
 print("Ping stdout output on error:\n" + e.output)

# Output returned normally
try:
 print("Ping stdout output on success:\n" + 
 subprocess.check_output(["ping", "-c", "2", "-w", "2", "8.8.8.8"]))
except subprocess.CalledProcessError as e:
 print("Ping stdout output on error:\n" + e.output)
</code></pre>

I see an output like this:

<pre><code>Ping stdout output on error:
PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.

--- 1.1.1.1 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1007ms


Ping stdout output on success:
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=59 time=37.8 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=59 time=38.8 ms

--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 37.840/38.321/38.802/0.481 ms
</code></pre>

blocks|key|1970240|text|如果您希望获得stdout和stderr返回(包括在发生事件时从CalledProcessError中提取它)，请使用以下方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1970241|import+subprocess

def+call_with_output(command):
++++success+=+False
++++try:
++++++++output+=+subprocess.check_output(command,+stderr=subprocess.STDOUT).decode()
++++++++success+=+True+
++++except+subprocess.CalledProcessError+as+e:
++++++++output+=+e.output.decode()
++++except+Exception+as+e:
++++++++#+check_call+can+raise+other+exceptions,+such+as+FileNotFoundError
++++++++output+=+str(e)
++++return(success,+output)

call_with_output(["ls",+"-l"])|code-block|syntax|javascript|1970242|这是与Python+2和3兼容的。|1970243|如果您的命令是字符串而不是数组，请将其前缀为：|1970244|import+shlex
call_with_output(shlex.split(command))|1970245|entityMap^0|0|0|0|0|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you want to get stdout and stderr back (including extracting it from the CalledProcessError in the event that one occurs), use the following:
<pre><code>import subprocess

def call_with_output(command):
 success = False
 try:
 output = subprocess.check_output(command, stderr=subprocess.STDOUT).decode()
 success = True 
 except subprocess.CalledProcessError as e:
 output = e.output.decode()
 except Exception as e:
 # check_call can raise other exceptions, such as FileNotFoundError
 output = str(e)
 return(success, output)

call_with_output([&quot;ls&quot;, &quot;-l&quot;])
</code></pre>
This is Python 2 and 3 compatible.
If your command is a string rather than an array, prefix this with:
<pre><code>import shlex
call_with_output(shlex.split(command))
</code></pre>

blocks|key|60955|text|我遇到了同样的问题，并发现文档有这类场景的示例(我们将STDERR编写到STDOUT，并且总是成功地退出，返回代码0)，而不会导致/捕获异常。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|60956|output+=+subprocess.check_output("ping+-c+2+-W+2+1.1.1.1;+exit+0",+stderr=subprocess.STDOUT,+shell=True)|code-block|syntax|javascript|60957|现在，您可以使用标准字符串函数find来检查输出字符串output。|style|CODE|60958|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.python.org/2/library/subprocess.html#subprocess.check_output^0|D|2|0|0|0|F|4|R|6|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$A|10|B|11|K|L]|$A|12|B|13|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

I ran into the same problem and found that the <a href="https://docs.python.org/2/library/subprocess.html#subprocess.check_output" rel="nofollow noreferrer">documentation</a> has example for this type of scenario (where we write STDERR TO STDOUT and always exit successfully with return code 0) without causing/catching an exception.

<pre><code>output = subprocess.check_output("ping -c 2 -W 2 1.1.1.1; exit 0", stderr=subprocess.STDOUT, shell=True)
</code></pre>

Now, you can use standard string function <code>find</code> to check the output string <code>output</code>.

blocks|key|145540|text|只有当主机响应ping时，才会返回true。在windows和linux上工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|145541|def+ping(host):
++++"""
++++Returns+True+if+host+(str)+responds+to+a+ping+request.
++++NB+on+windows+ping+returns+true+for+success+and+host+unreachable
++++"""
++++param+=+'-n'+if+platform.system().lower()=='windows'+else+'-c'
++++result+=+False
++++try:
++++++++out+=+subprocess.check_output(['ping',+param,+'1',+host])
++++++++#ping+exit+code+0
++++++++if+'Reply+from+{}'.format(host)+in+str(out):
++++++++++++result+=+True++++++++++
++++except++subprocess.CalledProcessError:
++++++++#ping+exit+code+not+0
++++++++++++result+=+False
++++#print(str(out))
++++return+result|code-block|syntax|javascript|145542|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|$]]

This will return true only if host responds to ping. Works on windows and linux

<pre><code>def ping(host):
 """
 Returns True if host (str) responds to a ping request.
 NB on windows ping returns true for success and host unreachable
 """
 param = '-n' if platform.system().lower()=='windows' else '-c'
 result = False
 try:
 out = subprocess.check_output(['ping', param, '1', host])
 #ping exit code 0
 if 'Reply from {}'.format(host) in str(out):
 result = True 
 except subprocess.CalledProcessError:
 #ping exit code not 0
 result = False
 #print(str(out))
 return result
</code></pre>

I am using subprocess.check_output from pythons subprocess module to execute a ping command. Here is how I am doing it:

<pre><code>output = subprocess.check_output(["ping","-c 2 -W 2","1.1.1.1")
</code></pre>

It is raising a CalledProcessError and says the output is one of the arguments of the function. Can anyone help me how to read that output. I would like to read the output into a string and parse it. So say for example if the ping returns 

<blockquote>
 100% packet loss
</blockquote>

I need to capture that. If there is any other better way..please suggest. Thanks.

check output from CalledProcessError

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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我正在使用pythons子进程模块的subprocess.check_output来执行ping命令。我就是这样做的：output = subprocess.check_output(["ping","-c 2 -W 2","1.1.1.1")它正在引发一个CalledProcessError，并表示输出是函数的参数之...

问检查CalledProcessError的输出
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问检查CalledProcessError的输出EN