将subprocess.Popen调用的输出存储在字符串中

问题:将subprocess.Popen调用的输出存储在字符串中

我正在尝试在Python中进行系统调用,并将输出存储到我可以在Python程序中操作的字符串中。

#!/usr/bin/python
import subprocess
p2 = subprocess.Popen("ntpq -p")

我尝试了一些事情,包括此处的一些建议:

检索subprocess.call()的输出

但没有任何运气。

I’m trying to make a system call in Python and store the output to a string that I can manipulate in the Python program.

#!/usr/bin/python
import subprocess
p2 = subprocess.Popen("ntpq -p")

I’ve tried a few things including some of the suggestions here:

Retrieving the output of subprocess.call()

but without any luck.


回答 0

在Python 2.7或Python 3中

Popen您可以使用subprocess.check_output()函数将命令的输出存储在字符串中,而不是直接创建对象:

from subprocess import check_output
out = check_output(["ntpq", "-p"])

在Python 2.4-2.6中

使用communicate方法。

import subprocess
p = subprocess.Popen(["ntpq", "-p"], stdout=subprocess.PIPE)
out, err = p.communicate()

out 是你想要的。

有关其他答案的重要说明

请注意我如何传递命令。该"ntpq -p"示例提出了另一回事。由于Popen不调用外壳程序,因此您将使用命令和选项列表["ntpq", "-p"]

In Python 2.7 or Python 3

Instead of making a Popen object directly, you can use the subprocess.check_output() function to store output of a command in a string:

from subprocess import check_output
out = check_output(["ntpq", "-p"])

In Python 2.4-2.6

Use the communicate method.

import subprocess
p = subprocess.Popen(["ntpq", "-p"], stdout=subprocess.PIPE)
out, err = p.communicate()

out is what you want.

Important note about the other answers

Note how I passed in the command. The "ntpq -p" example brings up another matter. Since Popen does not invoke the shell, you would use a list of the command and options—["ntpq", "-p"].


回答 1

这为我重定向标准输出工作(stderr可以类似地处理):

from subprocess import Popen, PIPE
pipe = Popen(path, stdout=PIPE)
text = pipe.communicate()[0]

如果对您不起作用,请确切说明您遇到的问题。

This worked for me for redirecting stdout (stderr can be handled similarly):

from subprocess import Popen, PIPE
pipe = Popen(path, stdout=PIPE)
text = pipe.communicate()[0]

If it doesn’t work for you, please specify exactly the problem you’re having.


回答 2

假设这pwd只是一个示例,可以通过以下方法进行:

import subprocess

p = subprocess.Popen("pwd", stdout=subprocess.PIPE)
result = p.communicate()[0]
print result

看到子文档另一个例子和更多信息。

Assuming that pwd is just an example, this is how you can do it:

import subprocess

p = subprocess.Popen("pwd", stdout=subprocess.PIPE)
result = p.communicate()[0]
print result

See the subprocess documentation for another example and more information.


回答 3

subprocess.Popen:http : //docs.python.org/2/library/subprocess.html#subprocess.Popen

import subprocess

command = "ntpq -p"  # the shell command
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=None, shell=True)

#Launch the shell command:
output = process.communicate()

print output[0]

在Popen构造函数中,如果shellTrue,则应以字符串而不是序列的形式传递命令。否则,只需将命令拆分为一个列表:

command = ["ntpq", "-p"]  # the shell command
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=None)

如果您还需要将标准错误读取到Popen初始化中,则可以将stderr设置为subprocess.PIPEsubprocess.STDOUT

import subprocess

command = "ntpq -p"  # the shell command
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)

#Launch the shell command:
output, error = process.communicate()

subprocess.Popen: http://docs.python.org/2/library/subprocess.html#subprocess.Popen

import subprocess

command = "ntpq -p"  # the shell command
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=None, shell=True)

#Launch the shell command:
output = process.communicate()

print output[0]

In the Popen constructor, if shell is True, you should pass the command as a string rather than as a sequence. Otherwise, just split the command into a list:

command = ["ntpq", "-p"]  # the shell command
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=None)

If you need to read also the standard error, into the Popen initialization, you can set stderr to subprocess.PIPE or to subprocess.STDOUT:

import subprocess

command = "ntpq -p"  # the shell command
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)

#Launch the shell command:
output, error = process.communicate()

回答 4

对于Python 2.7+,惯用的答案是使用 subprocess.check_output()

您还应该在调用子流程时注意对参数的处理,因为这可能会造成一些混乱。

如果args只是单个命令而没有自己的args(或您已shell=True设置),则它可以是字符串。否则,它必须是一个列表。

例如…调用ls命令,这很好:

from subprocess import check_call
check_call('ls')

是这样的:

from subprocess import check_call
check_call(['ls',])

但是,如果要将一些args传递给shell命令,则不能这样做:

from subprocess import check_call
check_call('ls -al')

相反,您必须将其作为列表传递:

from subprocess import check_call
check_call(['ls', '-al'])

shlex.split()函数有时在创建子进程之前将字符串拆分成类似shell的语法很有用…就像这样:

from subprocess import check_call
import shlex
check_call(shlex.split('ls -al'))

for Python 2.7+ the idiomatic answer is to use subprocess.check_output()

You should also note the handling of arguments when invoking a subprocess, as it can be a little confusing….

If args is just single command with no args of its own (or you have shell=True set), it can be a string. Otherwise it must be a list.

for example… to invoke the ls command, this is fine:

from subprocess import check_call
check_call('ls')

so is this:

from subprocess import check_call
check_call(['ls',])

however, if you want to pass some args to the shell command, you can’t do this:

from subprocess import check_call
check_call('ls -al')

instead, you must pass it as a list:

from subprocess import check_call
check_call(['ls', '-al'])

the shlex.split() function can sometimes be useful to split a string into shell-like syntax before creating a subprocesses… like this:

from subprocess import check_call
import shlex
check_call(shlex.split('ls -al'))

回答 5

这完全适合我:

import subprocess
try:
    #prints results and merges stdout and std
    result = subprocess.check_output("echo %USERNAME%", stderr=subprocess.STDOUT, shell=True)
    print result
    #causes error and merges stdout and stderr
    result = subprocess.check_output("copy testfds", stderr=subprocess.STDOUT, shell=True)
except subprocess.CalledProcessError, ex: # error code <> 0 
    print "--------error------"
    print ex.cmd
    print ex.message
    print ex.returncode
    print ex.output # contains stdout and stderr together 

This works perfectly for me:

import subprocess
try:
    #prints results and merges stdout and std
    result = subprocess.check_output("echo %USERNAME%", stderr=subprocess.STDOUT, shell=True)
    print result
    #causes error and merges stdout and stderr
    result = subprocess.check_output("copy testfds", stderr=subprocess.STDOUT, shell=True)
except subprocess.CalledProcessError, ex: # error code <> 0 
    print "--------error------"
    print ex.cmd
    print ex.message
    print ex.returncode
    print ex.output # contains stdout and stderr together 

回答 6

这对我来说是完美的。您将在元组中获得返回码,stdout和stderr。

from subprocess import Popen, PIPE

def console(cmd):
    p = Popen(cmd, shell=True, stdout=PIPE)
    out, err = p.communicate()
    return (p.returncode, out, err)

例如:

result = console('ls -l')
print 'returncode: %s' % result[0]
print 'output: %s' % result[1]
print 'error: %s' % result[2]

This was perfect for me. You will get the return code, stdout and stderr in a tuple.

from subprocess import Popen, PIPE

def console(cmd):
    p = Popen(cmd, shell=True, stdout=PIPE)
    out, err = p.communicate()
    return (p.returncode, out, err)

For Example:

result = console('ls -l')
print 'returncode: %s' % result[0]
print 'output: %s' % result[1]
print 'error: %s' % result[2]

回答 7

接受的答案仍然是好的,只是对新功能的一些评论。从python 3.6开始,您可以直接在中处理编码check_output,请参阅文档。现在返回一个字符串对象:

import subprocess 
out = subprocess.check_output(["ls", "-l"], encoding="utf-8")

在python 3.7中,capture_output向subprocess.run()添加了一个参数,该参数为我们执行了一些Popen / PIPE处理,请参见python docs

import subprocess 
p2 = subprocess.run(["ls", "-l"], capture_output=True, encoding="utf-8")
p2.stdout

The accepted answer is still good, just a few remarks on newer features. Since python 3.6, you can handle encoding directly in check_output, see documentation. This returns a string object now:

import subprocess 
out = subprocess.check_output(["ls", "-l"], encoding="utf-8")

In python 3.7, a parameter capture_output was added to subprocess.run(), which does some of the Popen/PIPE handling for us, see the python docs :

import subprocess 
p2 = subprocess.run(["ls", "-l"], capture_output=True, encoding="utf-8")
p2.stdout

回答 8

 import os   
 list = os.popen('pwd').read()

在这种情况下,列表中将只有一个元素。

 import os   
 list = os.popen('pwd').read()

In this case you will only have one element in the list.


回答 9

我根据此处的其他答案编写了一个小函数:

def pexec(*args):
    return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0].rstrip()

用法:

changeset = pexec('hg','id','--id')
branch = pexec('hg','id','--branch')
revnum = pexec('hg','id','--num')
print('%s : %s (%s)' % (revnum, changeset, branch))

I wrote a little function based on the other answers here:

def pexec(*args):
    return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0].rstrip()

Usage:

changeset = pexec('hg','id','--id')
branch = pexec('hg','id','--branch')
revnum = pexec('hg','id','--num')
print('%s : %s (%s)' % (revnum, changeset, branch))

回答 10

在Python 3.7中,capture_output为引入了新的关键字参数subprocess.run。启用简短的说明:

import subprocess

p = subprocess.run("echo 'hello world!'", capture_output=True, shell=True, encoding="utf8")
assert p.stdout == 'hello world!\n'

In Python 3.7 a new keyword argument capture_output was introduced for subprocess.run. Enabling the short and simple:

import subprocess

p = subprocess.run("echo 'hello world!'", capture_output=True, shell=True, encoding="utf8")
assert p.stdout == 'hello world!\n'

回答 11

import subprocess
output = str(subprocess.Popen("ntpq -p",shell = True,stdout = subprocess.PIPE, 
stderr = subprocess.STDOUT).communicate()[0])

这是一线解决方案

import subprocess
output = str(subprocess.Popen("ntpq -p",shell = True,stdout = subprocess.PIPE, 
stderr = subprocess.STDOUT).communicate()[0])

This is one line solution


回答 12

以下内容在单个变量中捕获了进程的stdout和stderr。它与Python 2和3兼容:

from subprocess import check_output, CalledProcessError, STDOUT

command = ["ls", "-l"]
try:
    output = check_output(command, stderr=STDOUT).decode()
    success = True 
except CalledProcessError as e:
    output = e.output.decode()
    success = False

如果您的命令是字符串而不是数组,请在此前缀:

import shlex
command = shlex.split(command)

The following captures stdout and stderr of the process in a single variable. It is Python 2 and 3 compatible:

from subprocess import check_output, CalledProcessError, STDOUT

command = ["ls", "-l"]
try:
    output = check_output(command, stderr=STDOUT).decode()
    success = True 
except CalledProcessError as e:
    output = e.output.decode()
    success = False

If your command is a string rather than an array, prefix this with:

import shlex
command = shlex.split(command)

回答 13

对于python 3.5,我根据先前的答案提出了功能。日志可能会被删除,以为拥有它很高兴

import shlex
from subprocess import check_output, CalledProcessError, STDOUT


def cmdline(command):
    log("cmdline:{}".format(command))
    cmdArr = shlex.split(command)
    try:
        output = check_output(cmdArr,  stderr=STDOUT).decode()
        log("Success:{}".format(output))
    except (CalledProcessError) as e:
        output = e.output.decode()
        log("Fail:{}".format(output))
    except (Exception) as e:
        output = str(e);
        log("Fail:{}".format(e))
    return str(output)


def log(msg):
    msg = str(msg)
    d_date = datetime.datetime.now()
    now = str(d_date.strftime("%Y-%m-%d %H:%M:%S"))
    print(now + " " + msg)
    if ("LOG_FILE" in globals()):
        with open(LOG_FILE, "a") as myfile:
            myfile.write(now + " " + msg + "\n")

For python 3.5 I put up function based on previous answer. Log may be removed, thought it’s nice to have

import shlex
from subprocess import check_output, CalledProcessError, STDOUT


def cmdline(command):
    log("cmdline:{}".format(command))
    cmdArr = shlex.split(command)
    try:
        output = check_output(cmdArr,  stderr=STDOUT).decode()
        log("Success:{}".format(output))
    except (CalledProcessError) as e:
        output = e.output.decode()
        log("Fail:{}".format(output))
    except (Exception) as e:
        output = str(e);
        log("Fail:{}".format(e))
    return str(output)


def log(msg):
    msg = str(msg)
    d_date = datetime.datetime.now()
    now = str(d_date.strftime("%Y-%m-%d %H:%M:%S"))
    print(now + " " + msg)
    if ("LOG_FILE" in globals()):
        with open(LOG_FILE, "a") as myfile:
            myfile.write(now + " " + msg + "\n")

回答 14

使用ckeck_output方法subprocess

import subprocess
address = 192.168.x.x
res = subprocess.check_output(['ping', address, '-c', '3'])

最后解析字符串

for line in res.splitlines():

希望对您有所帮助,编码愉快

Use ckeck_output method of subprocess

import subprocess
address = 192.168.x.x
res = subprocess.check_output(['ping', address, '-c', '3'])

Finally parse the string

for line in res.splitlines():

Hope it helps, happy coding