args-gone-wrong.py

# ok
def create_person(*args):
    first_name, last_name, age = args
    return {
        'First Name': first_name,
        'Last Name': last_name,
        'Age': age
    }

# Caller assumes the order: first name, last name, age.
person = create_person('John', 'Doe', 30)
print(person)  # Outputs: {'First Name': 'John', 'Last Name': 'Doe', 'Age': 30}

# not ok
def create_person(*args):
    # The order has changed to: age, first name, last name.
    age, first_name, last_name = args
    return {
        'First Name': first_name,
        'Last Name': last_name,
        'Age': age
    }

# Caller still assumes the old order: first name, last name, age.
person = create_person('John', 'Doe', 30)
print(person)  # Outputs: {'First Name': 'Doe', 'Last Name': 30, 'Age': 'John'}