from subprocess import check_output as qx
cmd = r'C:\Tools\Dvb_pid_3_0.exe'
output = qx(cmd)
要将stdout和stderr都作为单个字符串获取：
from subprocess import STDOUT
output = qx(cmd, stderr=STDOUT)
要将所有行作为列表：
lines = output.splitlines()
要获得子进程正在打印的行，请执行以下操作：
from subprocess import Popen, PIPE
p = Popen(cmd, stdout=PIPE, bufsize=1)
for line in iter(p.stdout.readline, ''):
print line,
p.stdout.close()
if p.wait() != 0:
raise RuntimeError("%r Failed, exit status: %d" % (cmd, p.returncode))
添加stderr=STDOUT到Popen()合并stdout / stderr的调用中。
注意：如果cmd在非交互模式下使用块缓冲，则直到缓冲区刷新后才会出现行。winpexpect模块可能能够更快地获取输出。
import subprocess
with open('output.txt', 'wb') as f:
subprocess.check_call(cmd, stdout=f)
# to read line by line
with open('output.txt') as f:
for line in f:
print line,
如果cmd总是要求输入，即使是空的；设置stdin：
import os
with open(os.devnull, 'rb') as DEVNULL:
output = qx(cmd, stdin=DEVNULL) # use subprocess.DEVNULL on Python 3.3+
您可以结合使用以下解决方案，例如，合并stdout / stderr并将输出保存到文件中，并提供空输入：
import os
from subprocess import STDOUT, check_call as x
with open(os.devnull, 'rb') as DEVNULL, open('output.txt', 'wb') as f:
x(cmd, stdin=DEVNULL, stdout=f, stderr=STDOUT)
要将所有输入作为单个字符串提供，您可以使用.communicate()方法：
#!/usr/bin/env python
from subprocess import Popen, PIPE
cmd = ["python", "test.py"]
p = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE, universal_newlines=True)
stdout_text, stderr_text = p.communicate(input="1\n\n")
print("stdout: %r\nstderr: %r" % (stdout_text, stderr_text))
if p.returncode != 0:
raise RuntimeError("%r Failed, status code %d" % (cmd, p.returncode))
在哪里test.py：
print raw_input('abc')[::-1]
raw_input('press enter to exit')
如果您与程序的交互更像是对话，而不需要winpexpect模块。这是docs的示例pexpect：
# This connects to the openbsd ftp site and
# downloads the recursive directory listing.
from winpexpect import winspawn as spawn
child = spawn ('ftp ftp.openbsd.org')
child.expect ('Name .*: ')
child.sendline ('anonymous')
child.expect ('Password:')
child.sendline ('noah@example.com')
child.expect ('ftp> ')
child.sendline ('cd pub')
child.expect('ftp> ')
child.sendline ('get ls-lR.gz')
child.expect('ftp> ')
child.sendline ('bye')
要发送特殊密钥，例如F3，F10在Windows上，您可能需要SendKeys模块或其纯Python实现SendKeys- ctypes。就像是：
from SendKeys import SendKeys
SendKeys(r"""
{LWIN}
{PAUSE .25}
r
C:\Tools\Dvb_pid_3_0.exe{ENTER}
{PAUSE 1}
1{ENTER}
{PAUSE 1}
2{ENTER}
{PAUSE 1}
{F3}
{PAUSE 1}
{F10}
""")
它不捕获输出。
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