Python Function Example: How to Define and Use a Function

Here's a basic example demonstrating how to define and use a function in Python:

# Define a function that takes in two numbers and returns their sum
def add_numbers(num1, num2):
    return num1 + num2

# Use the function by calling it with two arguments
result = add_numbers(3, 4)

# Print the result of the function call
print(result)  # Output: 7

In this code:

1. We define a function named 'add_numbers' using the def keyword. It takes two parameters: num1 and num2.
2. Inside the function, we calculate the sum of num1 and num2 and use the return statement to send the result back.
3. We call the add_numbers function with the arguments 3 and 4, storing the returned value in the result variable.
4. Finally, we print the value of result, which is 7.