Master Python’s os Module: Essential File & Directory Operations Explained

1. Overview of os module

Python’s os module provides common operating system functionalities.

2. Purpose of os module

It allows handling files and directories, making programs platform‑independent.

3. Common methods

1. os.name

Returns a string indicating the platform (e.g., 'nt' for Windows, 'posix' for Unix).

import os
print(os.name)

On Windows this outputs 'nt'.

2. os.getcwd()

Gets the current working directory.

import os
print(os.getcwd())

Result shown in the image.

3. os.listdir()

Returns a list of files and directories in the specified path.

import os
name = os.listdir(os.getcwd())
print(name)

Result shown in the image.

4. os.remove()

Deletes a file, e.g., removing a file named 2.txt.

import os
os.remove("2.txt")

5. os.system()

Executes a shell command.

import os
name = os.system('dir')
print(name)

Result shown in the image.

6. os.sep

Provides the OS‑specific path separator.

import os
print(os.sep)  # Windows returns '\\'

7. os.linesep

String giving the line terminator used by the platform.

print(os.linesep)  # '
' on Windows, '
' on Linux, '\r' on macOS

8. os.path.split()

Returns a tuple (directory, filename) for a given path.

os.path.split('C:\\Python25\\abc.txt')

9. os.path.isfile() and os.path.isdir()

Check whether a path is a file or a directory.

os.path.isdir(os.getcwd())
os.path.isfile('a.txt')

10. os.path.exists()

Tests whether a given path exists.

os.path.exists('C:\\Python25\\abc.txt')
os.path.exists('C:\\Python25')

11. os.path.abspath(name)

Gets the absolute path of a file.

import os
name = os.path.abspath("1.doc")
print(name)

12. os.path.normpath(path)

Normalizes a pathname.

import os
name = os.path.normpath("1.doc")
print(name)

13. os.path.getsize(name)

Returns the size of a file; returns 0 for directories.

import os
size = os.path.getsize("1.doc")
print(size)

14. os.path.splitext()

Splits the filename from its extension.

os.path.splitext('a.txt')

15. os.path.join(path, name)

Joins directory and file name into a full path.

os.path.join('c:\\Python', 'a.txt')
os.path.join('c:\\Python', 'f1')

16. os.path.basename(path)

Returns the file name from a path.

os.path.basename('a.txt')
os.path.basename('c:\\Python\\a.txt')

17. os.path.dirname(path)

Returns the directory component of a path.

os.path.dirname('c:\\Python\\a.txt')

4. Summary

This article introduced the usage of Python’s os module, demonstrated essential file‑handling functions, and provided practical code examples to help readers understand and apply these operations in their programs.