How to work with the Python os module

Table of Contents

Motivation

When you are dealing with files and directories or operating system version and environment variables the os module needs to become your friend

import os
print(os.getcwd())

os.name == "nt"   # Windows
os.name == "posix" #  Linux and macOS

assert os.environ.get("FOO") == "BAR"

os.path.isdir("../os_path")

os.path.exists(file_name)

os.path.join(path_1, path_2)

import os
full_path = '/book/html/foo/bar/'
base_path = '/book/html'
assert os.path.relpath(full_path, base_path) == '/foo/bar'

splitted = os.path.split('/book/html/foo/bar')
assert splitted == ("/book/html/foo", "bar")