def greet(name):
print(f"Hello, {name}!")
return name.upper()
def main():
greet("World")
result = greet("Alice")
print(result)
class Calculator:
def add(self, a, b):
return a + b
def multiply(self, a, b):
return self.add(a, 0) + a * b
calc = Calculator()
calc.add(5, 3)
calc.multiply(4, 2)