ModuleNotFoundError: No Module Named

Why This Happens

Python can only import modules installed in the active environment. If you have multiple Python installations or virtual environments, a package installed in one may not be available in another.

The Problem

import requests
response = requests.get('https://api.example.com')

The Fix

# First install: pip install requests
import requests
response = requests.get('https://api.example.com')

Step-by-Step Fix

1. 1

   Install the package

   Run pip install <package_name> in your terminal.

2. 2

   Check the environment

   Verify you are in the correct virtual environment: which python.

3. 3

   Check for typos

   Some packages have different import names. E.g., pip install Pillow but import PIL.