我如何在 python popen 中执行 output Linux 命令

Question

Write a python program that uses the popen function to obtain the output found by executing the ls -l command. After that find out the number of directories and the number of files after executing the command.

Answer 1

You could use os.listdir()

import os
dirs = os.listdir()
print(len(dirs))

if you want to filter out all the directories, you could use this

for x in dirs:
    if not os.path.isdir():
        dirs.remove(x)

Of course, popen could work as well, but I think it is way easier to do it like this.

To change the current directory you can use

os.chdir()

and to display the current directory use

os.getcwd()