Python 在循环的一次迭代后获得TypeError？

正如标题中提到的，我在使用我的代码时遇到了一个

TypeError:“float”对象不可调用。
代码使用我想要的信息正确运行了一次，但使用票价中的票价
第二次运行失败

错误信息如下：

File "/Users/dty2004/Desktop/AS 91373.py", line 71, in <module>
    discounted_price(destination_fare)
TypeError: 'float' object is not callable

# Define the lists required for storing discount and discount_price
fare_auck = ["Auckland"]
fare_well = ["Wellington"]
fare_roto = ["Rotorua"]

# Make the lists into a 2D list
fares = [fare_auck, fare_well, fare_roto]

# Define the menu() function, which gives us the basic interface for 
launching functions
def menu(destination, discounted_price, discount, saver_type, 
original_price):
    print("***** Waikato Air *****")
    print("These saver fares for tomorrow only!")
    print("Destination: {}".format(destination))
    print("Discounted Price: ${:.2f}".format(discounted_price))
    print("Percentage Discount: {:.2f}%".format(discount))
    print("This fare is a: {}".format(saver_type))
    print("Original Price: ${:.2f}".format(original_price))
    print("") # Added an empty string to format the function to look nice 
consecutively

# Define the function for destination determination
def destination_determiner():
    if fares[0][0] == "Auckland":
        travel_location = "Auckland"
        fares[0].insert(0, "placeholder")
        return travel_location
    elif fares[1][0] == "Wellington":
        travel_location = "Wellington"
        fares[1].insert(0, "placeholder")
        return travel_location
    elif fares[2][0] == "Rotorua":
        travel_location = "Rotorua"
        fares[2].insert(0, "placeholder")
        return travel_location

# Define the function for determining the type of saver fare this is
def saver_type(discount):
    if discount < 20 and discount > -1:
        saver_type = "Quick Saver"
        return saver_type
    elif discount >= 20 and discount <= 50:
        saver_type = "Smart Saver"
        return saver_type
    elif discount > 50 and discount < 101:
        saver_type = "Super Saver"
        return saver_type
    else:
        print("Sorry that input is invalid")

# Define the function for determining the original_price
def original_price_calc(discount, discounted_price):
    original_price = discounted_price * (discount / 100 + 1)
    return original_price

# Define the function for getting discounted_price from user input
def discounted_price(destination):
    discounted_price = float(input("Please input the discounted price to 
{}".format(destination_fare)))
    fare.append(discounted_price)

# Define the same function for getting discount from user input
def discount(destination):
    discount = float(input("Please input the discount in percentage to 
{}".format(destination_fare)))
    fare.append(discount)

# Run the entire code, formatted into a print statement
for fare in fares:
    destination_fare = destination_determiner()
    discounted_price(destination_fare)
    discount(destination_fare)
    discounted_price = fare[2]
    discount = fare[3]
    menu(destination_fare, discounted_price, discount, saver_type(discount), 
original_price_calc(discount, discounted_price))

我不确定为什么第一次这么做有效，第二次却不行。
还要记住，我是一名学生，因此可能不太了解更高级的python命令

提前感谢。
您正在将折扣价格重新分配给以下变量：

# Run the entire code, formatted into a print statement
for fare in fares:
    destination_fare = destination_determiner()
    discounted_price(destination_fare) # still a function
    discount(destination_fare)
    discounted_price = fare[2] # now a float!!!!
    discount = fare[3] # same with this (overrides discount from earlier)
    menu(destination_fare, discounted_price, discount, saver_type(discount), 
original_price_calc(discount, discounted_price))

将变量重命名为其他名称

for fare in fares:
    destination_fare = destination_determiner()
    discounted_price(destination_fare)
    discount(destination_fare)
    discounted_price_value = fare[2]
    discount_value = fare[3]
    menu(destination_fare, discounted_price_value, discount_value, 
         saver_type(discount_value),
         original_price_calc(discount_value, discounted_price_value))

你在左右重复使用名字。每个变量名应该只引用一件事。
for fare in fares:
    destination_fare = destination_determiner()
    discounted_price(destination_fare)
    discount(destination_fare)
    discounted_price_value = fare[2]
    discount_value = fare[3]
    menu(destination_fare, discounted_price_value, discount_value, 
         saver_type(discount_value),
         original_price_calc(discount_value, discounted_price_value))