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Python Course in 4 to 6 Weeks – Lesson 13: Modules & Libraries

📦 Python Course in 4 to 6 Weeks – Lesson 13: Modules & Libraries

Welcome to Lesson 13 of the Python Course in 4 to 6 Weeks! In this lesson, you'll learn how to use modules and libraries to structure your code and leverage existing tools. These features make Python powerful and scalable for any project.

✅ What You'll Learn

  • What modules and libraries are
  • How to import and use built-in modules
  • Installing and using external libraries (like requests, math, etc.)
  • Creating your own Python module
  • Best practices for modular programming

📚 What Is a Module?

A module is simply a Python file containing functions, classes, or variables that you can reuse.

# mymodule.py
def greet(name):
    return f"Hello, {name}!"

📥 Importing a Module

import mymodule

print(mymodule.greet("Amr"))

You can also import specific parts:

from mymodule import greet
print(greet("Sara"))

📦 Built-in Modules

import math
print(math.sqrt(16))
  • math – mathematical operations
  • random – generate random numbers
  • datetime – handle dates and times

🌐 External Libraries

You can install new libraries using pip (Python's package manager):

pip install requests
import requests
response = requests.get("https://api.github.com")
print(response.status_code)

⚙️ Creating Your Own Library

  • Create a .py file with functions
  • Save it in your project folder
  • Import and reuse it across files

⚠️ Common Mistakes

  • ❌ Forgetting to add __init__.py for module folders in older versions
  • ❌ Importing before installing (use pip install first)
  • ❌ Naming your script the same as a library (e.g., random.py)

🧪 Practice Challenge

Create a Python file named text_utils.py with:

  • A function to count words in a string
  • A function to convert strings to title case
  • Then import and test these functions in another file

📥 Tools You'll Need

📌 Final Words

Modules and libraries help you avoid writing repetitive code and make your projects clean and scalable. In the next lesson, we’ll build a simple Python project using what we’ve learned so far!

🔗 Coming Next:

Lesson 14: Python Mini Project – Build a Simple Real-World App 🛠️

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