Valeurs par défaut

def greet(name, greeting="Hello"):
    print(name, greeting)

greet("John")
# Output: John Hello

greet("john", "welcome")
# Output: john welcome

def describe_person(name, age=25, city="Unknown"):
    print(f"{name} is {age} years old and lives in {city}")

describe_person("Alice")
# Uses both defaults

describe_person("Bob", 30)
# Uses default city

describe_person("Charlie", 35, "New York")
# Uses no defaults

# Correct:
def greet(name, greeting="Hello"):
    print(f"{greeting}, {name}!")

# Incorrect:
def greet(greeting="Hello", name):
    print(f"{greeting}, {name}!")