保持子进程活着并继续给它命令?Python [英] Keep a subprocess alive and keep giving it commands? Python
本文介绍了保持子进程活着并继续给它命令?Python的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如果我使用给定命令在 python 中生成一个新的 subprocess
(假设我使用 python
命令启动 python 解释器),我如何将新数据发送到过程(通过 STDIN)?
If I spawn a new subprocess
in python with a given command (let's say I start the python interpreter with the python
command), how can I send new data to the process (via STDIN)?
推荐答案
Use the standard subprocess module. You use subprocess.Popen() to start the process, and it will run in the background (i.e. at the same time as your Python program). When you call Popen(), you probably want to set the stdin, stdout and stderr parameters to subprocess.PIPE. Then you can use the stdin, stdout and stderr fields on the returned object to write and read data.
未经测试的示例代码:
from subprocess import Popen, PIPE
# Run "cat", which is a simple Linux program that prints it's input.
process = Popen(['/bin/cat'], stdin=PIPE, stdout=PIPE)
process.stdin.write(b'Hello
')
process.stdin.flush()
print(repr(process.stdout.readline())) # Should print 'Hello
'
process.stdin.write(b'World
')
process.stdin.flush()
print(repr(process.stdout.readline())) # Should print 'World
'
# "cat" will exit when you close stdin. (Not all programs do this!)
process.stdin.close()
print('Waiting for cat to exit')
process.wait()
print('cat finished with return code %d' % process.returncode)
这篇关于保持子进程活着并继续给它命令?Python的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文