Problem Solving with Functions

Big problem → Multiple small functions

def get_player_input():
    return input("Enter choice: ")

def check_winner(player, computer):
    if player == computer:
        return "Tie!"
    # ... more logic

def play_game():
    for i in range(3):
        player = get_player_input()
        computer = random_choice()
        result = check_winner(player, computer)
        print(result)

def add(a, b): return a + b
def subtract(a, b): return a - b
def multiply(a, b): return a * b
def divide(a, b): return a / b

def calculate():
    operation = input("+ - * /: ")
    num1 = float(input("Number 1: "))
    num2 = float(input("Number 2: "))

    if operation == "+":
        print(add(num1, num2))
    # ... more operations