Python Modules Tutorial 📚

What is a Python Module?

A Python module is a file containing Python code that can be imported into other Python programs. It helps in organizing code into reusable components and promoting modularity.

How to Create a Module

1. Create a .py file (e.g., mymodule.py)
2. Define functions/classes inside the file

   # mymodule.py
   def greet():
       return "Hello from a module!"
   

3. Import and use it in another script:

   import mymodule
   print(mymodule.greet())
   

Common Built-in Modules

• math 📐 (Mathematical operations)
• os 📁 (Operating system interactions)
• datetime ⏳ (Date and time handling)
• random 🎲 (Random number generation)
• sys 🧠 (System-specific functions)

Third-party Libraries

Explore popular external packages like:

• NumPy 📊 for scientific computing
• Flask 🌐 for web development
• Pillow 🖼️ for image manipulation

Best Practices

✅ Keep modules focused on single responsibilities
✅ Use meaningful names
✅ Document functions with docstrings 📖
✅ Avoid circular imports ❌

Learn more about Python packages to deepen your understanding! 🚀