Why modules are needed in Python - See It in Action

Why modules are needed

📖 Scenario: Imagine you are building a simple calculator program. As the program grows, it becomes hard to manage all the code in one place. Modules help by letting you organize code into separate files, making it easier to read and reuse.

🎯 Goal: You will create a small program that uses a module to perform addition and subtraction. This will show why modules are helpful to keep code organized and reusable.

📋 What You'll Learn

Create a module file with two functions: add and subtract

Create a main program that imports the module

Use the functions from the module to calculate results

Print the results in the main program

💡 Why This Matters

🌍 Real World

In real projects, modules help programmers split big programs into smaller parts. This makes teamwork easier and code easier to fix or improve.

💼 Career

Knowing how to create and use modules is important for software developers to write clean, reusable, and maintainable code.

1

Create a module with add and subtract functions

Create a file named mymath.py with two functions: add(a, b) that returns the sum of a and b, and subtract(a, b) that returns the difference of a and b. Write the code for both functions exactly as described.

Python

# Define add and subtract functions in mymath.py
# Your code here

Need a hint?

Define two functions named add and subtract that take two parameters each and return the sum and difference respectively.

2

Import the module in the main program

In a new file named main.py, write the code to import the mymath module you created in Step 1.

Python

# Import the mymath module
# Your code here

Need a hint?

Use the import keyword followed by the module name mymath.

3

Use the add and subtract functions from the module

In main.py, use the add function from mymath to add 10 and 5, and use the subtract function from mymath to subtract 5 from 10. Store the results in variables sum_result and diff_result respectively.

Python

import mymath
# Use mymath.add to add 10 and 5 and store in sum_result
# Use mymath.subtract to subtract 5 from 10 and store in diff_result
# Your code here

Need a hint?

Call the functions with the syntax mymath.add(10, 5) and mymath.subtract(10, 5).

4

Print the results

In main.py, print the values of sum_result and diff_result on separate lines.

Python

import mymath

sum_result = mymath.add(10, 5)
diff_result = mymath.subtract(10, 5)
# Print sum_result and diff_result
# Your code here

Need a hint?

Use two print statements to show the results.