Python Decorator

python_decorator.py

# source: https://www.pythontutorial.net/advanced-python/python-decorators/

def currency(fn):
    def wrapper(*args, **kwargs):
        result = fn(*args, **kwargs)
        return f'${result}'
    return wrapper


@currency
def net_price(price, tax):
    """ calculate the net price from price and tax
    Arguments:
        price: the selling price
        tax: value added tax or sale tax
    Return
        the net price
    """
    return price * (1 + tax)


print(net_price(100, 0.05)) # output: $105.0