使用 subprocess.Popen 执行 bash [英] Executing bash with subprocess.Popen

问题描述

我正在尝试使用 python 为 bash 会话编写包装器.我做的第一件事就是尝试生成一个 bash 进程，然后尝试读取它的输出.像这样:

I'm trying to write a wrapper for a bash session using python. The first thing I did was just try to spawn a bash process, and then try to read its output. like this:

from subprocess import Popen, PIPE
bash = Popen("bash", stdin = PIPE, stdout = PIPE, stderr = PIPE)
prompt = bash.stdout.read()
bash.stdin.write("ls\n")
ls_output = bash.stdout.read()

但这行不通.首先，在创建进程后从 bash 的标准输出读取失败，当我尝试写入标准输入时，出现管道损坏错误.我做错了什么?

But this does not work. First, reading from bash's stdout after creating the process fails, and when I try to write to stdin, I get a broken pipe error. What am I doing wrong?

再次澄清，我对通过 bash 运行单个命令然后检索其输出不感兴趣，我希望在某个进程中运行一个 bash 会话，我可以通过管道与之通信.

Just to clarify again, I'm not interested in running a single command via bash and then retrieving its output, I want to have a bash session running in some process with which I can communicate via pipes.

推荐答案

这有效:

import subprocess
command = "ls"
p = subprocess.Popen(command, shell=True, bufsize=0, stdout=subprocess.PIPE, universal_newlines=True)
p.wait()
output = p.stdout.read()
p.stdout.close()

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