[英]How to call an external program in python and retrieve the output and return code?
How can I call an external program with a python script and retrieve the output and return code?如何使用 python 脚本调用外部程序并检索 output 并返回代码?
Look at the subprocess module: a simple example follows...查看subprocess模块:下面是一个简单的示例...
from subprocess import Popen, PIPE
process = Popen(["ls", "-la", "."], stdout=PIPE)
(output, err) = process.communicate()
exit_code = process.wait()
Following Ambroz Bizjak's previous comment, here is a solution that worked for me:在 Ambroz Bizjak 之前的评论之后,这里有一个对我有用的解决方案:
import shlex
from subprocess import Popen, PIPE
cmd = "..."
process = Popen(shlex.split(cmd), stdout=PIPE)
process.communicate()
exit_code = process.wait()
After some research, I have the following code which works very well for me.经过一些研究,我有以下代码对我来说效果很好。 It basically prints both stdout and stderr in real time.它基本上实时打印标准输出和标准错误。 Hope it helps someone else who needs it.希望它可以帮助其他需要它的人。
stdout_result = 1
stderr_result = 1
def stdout_thread(pipe):
global stdout_result
while True:
out = pipe.stdout.read(1)
stdout_result = pipe.poll()
if out == '' and stdout_result is not None:
break
if out != '':
sys.stdout.write(out)
sys.stdout.flush()
def stderr_thread(pipe):
global stderr_result
while True:
err = pipe.stderr.read(1)
stderr_result = pipe.poll()
if err == '' and stderr_result is not None:
break
if err != '':
sys.stdout.write(err)
sys.stdout.flush()
def exec_command(command, cwd=None):
if cwd is not None:
print '[' + ' '.join(command) + '] in ' + cwd
else:
print '[' + ' '.join(command) + ']'
p = subprocess.Popen(
command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=cwd
)
out_thread = threading.Thread(name='stdout_thread', target=stdout_thread, args=(p,))
err_thread = threading.Thread(name='stderr_thread', target=stderr_thread, args=(p,))
err_thread.start()
out_thread.start()
out_thread.join()
err_thread.join()
return stdout_result + stderr_result
Check out the subprocess module here: http://docs.python.org/library/subprocess.html#module-subprocess .在此处查看子流程模块: http://docs.python.org/library/subprocess.html#module-subprocess 。 It should get what you need done.它应该可以完成您需要的工作。
I've developed a little library ( py-execute ) that allows you to execute external programs, retrieve the output and the retcode and, at the same time get output in console in real time:我开发了一个小库( py-execute ),允许您执行外部程序,检索 output 和 retcode,同时在控制台中实时获取 output:
>>> from py_execute.process_executor import execute
>>> ret = execute('echo "Hello"')
Hello
>>> ret
(0, 'Hello\n')
You can avoid printing to console passing a mock user_io:您可以避免通过模拟 user_io 打印到控制台:
>>> from mock import Mock
>>> execute('echo "Hello"', ui=Mock())
(0, 'Hello\n')
I wrote it because with plain Popen (In Python 2.7) I was having trouble executing commands with a long output我写它是因为使用普通 Popen(在 Python 2.7 中)我在执行长 output 的命令时遇到问题
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.