What osos is for

The osos module provides:

• current working directory
• directory listing
• environment variables
• basic path manipulation (but prefer pathlibpathlib for paths)

Current working directory

import os
 
print(os.getcwd())

import os
 
print(os.getcwd())

List files

import os
 
for name in os.listdir("."):
    print(name)

import os
 
for name in os.listdir("."):
    print(name)

Change directory

import os
 
os.chdir("/tmp")
print(os.getcwd())

import os
 
os.chdir("/tmp")
print(os.getcwd())

Environment variables

import os
 
print(os.environ.get("HOME"))

import os
 
print(os.environ.get("HOME"))

Notes

For paths, use pathlib.Pathpathlib.Path whenever possible.

🧪 Try It Yourself

Exercise 1 – List Files with os.listdir

Exercise 2 – Join Paths with os.path.join

Exercise 3 – Write and Read a File