函数为每个人返回相同的值。

Question

我正在为学校做一个学习Python的项目。在这个项目中，你坐在一家餐馆里，你给账单编程。当我计算每个人在函数中花费的总和并返回值时。我只收到每个人最后一个人的总数。

如果运行此代码并使用以下值：

2
tim
4
4
james
12
12

你会发现他们总共得到了69英镑。我想，如果我按下"calculate_amount“后面的一次选项卡将其放入for循环中，您会看到它实际上为其他人计算了正确的金额，但不知何故，当您将其从for循环中删除时，它会覆盖它。

我想要的是，在每个人告诉我他们吃了多少饮料和蛋糕之后，我得到了一份最后的报告，上面有每个人的总数。就像我现在做的一样，但是有正确的总数。

我希望有人能把我引向正确的方向，谢谢

#function makes first a calculation of the total each person has spend

def calculate_amount(amount_drinks, amount_cake):
    count_number = 0
    totaalFris = amount_drinks * drink_price
    total_cake = amount_cake * cake_price
    totaal = total_cake + totaalFris
    totaal = str(totaal)

    # then a for statement to print for each person the amount they have spend
    for person in list_names:
        count_number += 1
        print(str(count_number) + " " + person + " " + str(totaal))


#prices of the food
drink_price = 2.50
cake_price = 3.25


#lists
list_names = []
drinked_sodas = []
eaten_food = []
count = 0

#while loop to check if there are coming people between 2-6
while True:
    person_amount = int(input("How many people are coming? (2-6) "))
    if person_amount < 2 or person_amount > 6:
        print("error")
    else: break


# ask for every person coming what their name, drinks and food is. and add that to the lists
for persoon in range(person_amount):
    naam_persoon = str(input('\nWhat is your name? '))
    list_names.append(naam_persoon)

    glasses = int(input("How many drinks did you had? "))
    drinked_sodas.append(glasses)

    cake = int(input("how much cake did you eat? "))
    eaten_food.append(cake)
    count += 1

#calling the function which calculates the amount of glasses and cakes everyone had
#if u you put the function in this for statement it kinda works(press one time tab)

    calculate_amount(glasses, cake)



#problem is I get same total amount for every person.

Answer 1

使用calculate_amount()函数，您没有在购买饮料的人中进行分析，因此该函数无法打印购买饮料的人，因此它只需多次打印给定金额的值。

相反，您可以尝试创建一个使用名称、饮料和蛋糕变量的函数，并为每个人调用该函数：

drink_price = 2.50
cake_price = 3.25 

def singular_tab(name, glasses, cakes):
    total_drinks = glasses * drink_price
    total_cakes = cakes * cake_price
    total = total_drinks + total_cakes
    return print(f'name: {name}, tab: {total}')
   
while True:
    person_amount = int(input("How many people are coming? (2-6) "))
    if person_amount < 2 or person_amount > 6:
        print("error")
    else: break


for persoon in range(person_amount):
    naam_persoon = str(input('\nWhat is your name? '))
    glasses = int(input("How many drinks did you had? "))
    cake = int(input("how much cake did you eat? "))
    singular_tab(naam_persoon, glasses, cake)

Answer 2

为了计算每个人花费的总金额，我使用了python字典。在字典里，我储存了名字，蛋糕的数量和饮料的数量。

在将相关信息存储在字典中之后，我将字典解析为一个函数，然后打印出每个人的选项卡。

drink_price = 2.50
cake_price = 3.25
people_data = []

def tab_amount(dict):
    final = []
    final_text = ""
    for people in dict:
        cake_total = int(people[2]) * cake_price
        glass_total = int(people[1]) * drink_price
        person_total = cake_total + glass_total
        final.append([people[0], person_total])
        person_total = 0
    for totals in final:
        final_text += f'name: {totals[0]} spent in total: {totals[1]} euro\n'
    return final_text

        
        

while True:
    person_amount = int(input("How many people are coming? (2-6) "))
    if person_amount < 2 or person_amount > 6:
        print("error")
    else: break


for person in range(person_amount):
    name = str(input('\nWhat is your name? '))
    glasses = int(input("How many drinks did you had? "))
    cake = int(input("how much cake did you eat? "))
    people_data.append([name, glasses, cake])
    
print(tab_amount(people_data))

希望这会有所帮助:)