Creating Your Own Modules

Creating your own modules in Python is an excellent way to organize, reuse, and share your code. A module is simply a .py file that contains functions, classes, or variables that you can import and use in other programs.

---

Why Create Modules?

• Organization: Divides your project into smaller, more manageable files.
• Reuse: Uses the same code in different programs without copying and pasting.
• Maintenance: Makes it easier to update and fix errors in one place.

---

How to Create a Module?

1. Create a .py file For example, create a file called greetings.py with the following content:

greetings.py

def greet(name):
  print(f'Hello, {name}!')

2. Import your module into another file Now, in your main file, you can import and use the function:

Using a Custom Module

import greetings

greetings.greet('Ana')

Output:

Hello, Ana!

---

Import Specific Functions

You can also import only what you need from your module:

Importing a Specific Function

from greetings import greet

greet('Carlos')

---

Where Should Modules Be Located?

For Python to find your module, it must be in the same directory as your main file or in a folder included in the PYTHONPATH.

---

Best Practices

• Use descriptive names for your modules and functions.
• Avoid spaces and special characters in file names.
• Keep each module focused on a single task or theme.

---

Summary

• Creating modules helps you organize and reuse your code.
• You only need a .py file to get started.
• Import your modules and functions as needed in your projects.

Ready to practice? Create a module with your own functions and test it in a new program.