class Product:
    def __init__(self, name, price):
        self.name = name
        self.price = price

    def __str__(self):
        return f"{self.name} costs ${self.price}"

p = Product("Laptop", 1200)
print(p)  # Laptop costs $1200

Laptop costs $1200

class Vector:
    def __init__(self, x):
        self.x = x

    def __add__(self, other):
        return Vector(self.x + other.x)

v1 = Vector(5)
v2 = Vector(7)
v3 = v1 + v2

print(v3.x)  # Output: 12

12

class Balance:
    def __init__(self, amount):
        self.amount = amount

    def __sub__(self, other):
        return Balance(self.amount - other.amount)

b1 = Balance(100)
b2 = Balance(40)

result = b1 - b2
print(result.amount)  # Output: 60

60

# setup.py
from setuptools import setup, find_packages

setup(
    name="mypackage",
    version="1.0",
    packages=find_packages()
)

class Cat:
    def sound(self):
        print("Meow")

class Dog:
    def sound(self):
        print("Bark")

def make_sound(animal):
    animal.sound()

make_sound(Cat())
make_sound(Dog())

Meow
Bark

def safe_divide(a, b):
    try:
        return a / b
    except ZeroDivisionError as e:
        return f"Error: {e}"
    except Exception as e:
        return f"Unexpected error: {e}"
    finally:
        print("Operation attempted")

print(safe_divide(10, 0))

Operation attempted
Error: division by zero

def main():
    """Application entry point"""
    print("Application started")

if __name__ == "__main__":
    main()

Application started

try:
    result = 10 / 0
except ZeroDivisionError:
    print("Handled division by zero safely")

Handled division by zero safely

def main():
    print("Program started")

main()

Program started

def validate_age(age):
    if age < 0:
        raise ValueError("Age cannot be negative")

validate_age(-5)