Python try 块不捕获 os.system 异常 [英] Python try block does not catch os.system exceptions

问题描述

我有这个python代码:

I have this python code:

import os
try:
  os.system('wrongcommand')
except:
  print("command does not work")

代码打印:

wrongcommand: command not found

代替命令不起作用.有谁知道为什么它不打印我的错误消息?

Instead of command does not work. Does anyone know why it's not printing my error message?

推荐答案

如果你想在命令不存在时抛出异常，你应该使用subprocess:

If you want to have an exception thrown when the command doesn't exist, you should use subprocess:

import subprocess
try:
    subprocess.run(['wrongcommand'], check = True)
except subprocess.CalledProcessError:
    print ('wrongcommand does not exist')

想想看，无论如何你应该使用 subprocess 而不是 os.system ...

Come to think of it, you should probably use subprocess instead of os.system anyway ...

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