Silly Decorator #2: @plus_one

from plusonedecorator import plus_one
@plus_one
def cost(quantity: int, marginal_cost: float) -> float:
    """Compute the cost of production."""
    return quantity * marginal_cost

cost(1000, 0.25)

@plus_one
def invite(name: str, pronoun: str) -> str:
    """Decide to invite someone to your wedding."""
    return f"Let's be sure to invite {name} and {pronoun}."

invite("Emilia", "her")

invite("Maxwell", "his")

invite("Taylor", "their")