通过Python运行终端命令时出现问题 [英] Problems running terminal command via Python

问题描述

我正在做一个小项目，需要通过python控制控制台播放器.此示例命令可在Linux终端上完美运行:

I'm working on a small project where I need to control a console player via python. This example command works perfectly on the Linux terminal:

mplayer -loop 0 -playlist <(find "/mnt/music/soundtrack" -type f | egrep -i '(\.mp3|\.wav|\.flac|\.ogg|\.avi|\.flv|\.mpeg|\.mpg)'| sort)

在Python中，我正在执行以下操作:

In Python I'm doing the following:

command = """mplayer -loop 0 -playlist <(find "/mnt/music/soundtrack" -type f | egrep -i '(\.mp3|\.wav|\.flac|\.ogg|\.avi|\.flv|\.mpeg|\.mpg)'| sort)""" 
os.system(command)

问题是，当我使用Python尝试运行它时，它给我一个错误:

The problem is when I try it using Python it gives me an error when I run it:

sh: 1: Syntax error: "(" unexpected

我真的很困惑，因为它是完全相同的字符串.为什么第二种方法不起作用?

I'm really confused here because it is the exact same string. Why doesn't the second method work?

谢谢.

推荐答案

您的默认用户shell可能是 bash .在Linux中，Python的 os.system 命令默认调用 sh .

Your default user shell is probably bash. Python's os.system command calls sh by default in linux.

一种解决方法是使用 subprocess.check_call()并传递 shell = True 作为参数，告诉 subprocess 使用默认用户shell执行.

A workaround is to use subprocess.check_call() and pass shell=True as an argument to tell subprocess to execute using your default user shell.

import subprocess
command = """mplayer -loop 0 -playlist <(find "/mnt/music/soundtrack" -type f | egrep -i '(\.mp3|\.wav|\.flac|\.ogg|\.avi|\.flv|\.mpeg|\.mpg)'| sort)"""
subprocess.check_call(command, shell=True)

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