Learning How to Define and Use Functions in Python

Why I studied this

Functions make code reusable and cleaner.
I wanted to learn how to write functions, pass values to them, and return results.

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What I did

Basic function without parameters

def greeting():
    print("Hello!")
    print("Welcome to my program")

greeting()

This function prints a simple message.
Functions are defined using def and called by name.

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Function with parameters

def say_hi(name):
    print(f"Hi {name}, nice to meet you!")

say_hi("Chris")
say_hi("Alex")

Functions can receive data through parameters.

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Function with return value

def square(x):
    return x * x

result = square(5)
print(result)  # 25

The return keyword sends a value back from the function.

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Combining functions

def add(a, b):
    return a + b

def multiply(x, y):
    return x * y

print(add(3, 4))        # 7
print(multiply(5, 6))   # 30

You can define multiple functions and use them together.

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What I learned

I learned how to write and call functions, use parameters, and return results.
Functions help organize code and avoid repetition.

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What I want to do next

I want to try writing functions that work with lists or loops, and maybe build a small calculator program using functions.