如何使用实时输出运行python子进程? [英] How to run python subprocess with real-time output?

问题描述

当我在 Python 中运行 shell 命令时，它在命令完成之前不会显示输出.我运行的脚本需要几个小时才能完成，我想在它运行时查看进度.如何让 python 运行它并实时显示输出?

When I run a shell command in Python it does not show the output until the command is finished. the script that I run takes a few hours to finish and I'd like to see the progress while it is running. How can I have python run it and show the outputs in real-time?

推荐答案

使用以下函数运行您的代码.在这个例子中，我想运行一个带有两个参数的 R 脚本.您可以将 cmd 替换为任何其他 shell 命令.

Use the following function to run your code. In this example, I want to run an R script with two arguments. You can replace cmd with any other shell command.

from subprocess import Popen, PIPE

def run(command):
    process = Popen(command, stdout=PIPE, shell=True)
    while True:
        line = process.stdout.readline().rstrip()
        if not line:
            break
        print(line)

cmd = f"Rscript {script_path} {arg1} {arg2}"
run(cmd)

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