在数组中选择一个字符串变量 - Python答案

【问题标题】：Choosing a string variable in an array - Python在数组中选择一个字符串变量 - Python
【发布时间】：2016-02-10 06:08:31
【问题描述】：

我正在努力从数组中挑选出一组字符串变量。

代码：

数组中的项目：

pizzas_with_prices = [("Hawaiian", 8.5), ("Veg Deluxe", 8.5), ("Ham and Cheese", 8.5),("Super Supreme", 8.5), ("Seafood Deluxe", 8.5),("Meatlovers", 11.5), ("Hot 'n' Spicy", 11.5), ("BBQ Chicken and Bacon", 11.5),("Satay Chicken", 11.5)]

选择数组中的比萨饼：

for n in range(numPizza):
    pizza = pizza + [int(input("Choose a pizza: "))]

所选披萨的总价：

for selected in pizza:
    total_price += pizzas_with_prices[selected][1]
    print("$%s" % (total_price))

我无法在数组中获取所选比萨饼的名称，但我可以获取所选比萨饼的总价格。感谢您的任何帮助！

编辑：

完整代码：

pizzas_with_prices = [("Hawaiian", 8.5), ("Veg Deluxe", 8.5), ("Ham and Cheese", 8.5),
                  ("Super Supreme", 8.5), ("Seafood Deluxe", 8.5),
                  ("Meatlovers", 11.5), ("Hot 'n' Spicy", 11.5), ("BBQ Chicken and Bacon", 11.5),
                  ("Satay Chicken", 11.5)]

def menu():
print("Delivery or Pickup?")
print()
print("1] Delivery ($5 charge)")
print("2] Pickup")
print()

option = int(input(">>"))
if option < 1 or option > 2:
    print("Only 1 or 2")
print()

if option == 1:
    customerName = input("Enter customers name: ")
    customerAddress = input("Enter customer Address: ")
    customerPhone = input("Enter your phone number: ")
    print()
    print("Thank you", customerName, "Customers Address is", customerAddress, "and customers phone number is", customerPhone)
    print()
    orderPizza()

if option == 2:
    customerName = input("Enter customers name: ")
    print()
    orderPizza()

def orderPizza():
numPizza=0
global pizzas_with_prices
Flag = True 
while Flag:
    try:
        numPizza= int(input("How many Pizzas do you want? (MAX 7): "))
        if numPizza ==0 or numPizza > 7:
            print("Not a correct choice, Try again")
        else:
            Flag = False 
    except ValueError:
        print("Not a number, Try again")

print()
for index, pizza in enumerate(pizzas_with_prices):
    print("%d %s: $%s" % (index, pizza[0], pizza[1]))
    pizza=[] 

for n in range(numPizza): #covers values from 0 to 9 
    pizza = pizza + [int(input("Choose a pizza: "))] 
    print(pizza)
total_price = 0
for selected in pizza:
    total_price += pizzas_with_prices[selected][1]
    print("$%s" % (total_price))

menu()

【问题讨论】：

您使用的是什么语言（不是 Java 或 C/C++）？
抱歉忘了说 Python 会改标题谢谢
pizzas_with_prices[selected][0] 没有打印出来？
你能澄清你的问题吗？您的示例代码不会尝试检索披萨标签字符串，但这就是您说您遇到问题的部分。您尝试了哪些方法，哪些没有按您的预期工作？
你从哪里得到[0] 位

标签： python arrays python-3.x

【解决方案1】：

IMO 最好使用字典来查找价格，这样您就不必循环到整个价格列表。然后使用求和函数：

pizzas_with_prices = {'pizza1': 10, 'pizza2': 15}
selected_pizzas = []
# create the list of selected_pizzas with your code
# eg: selected_pizzas = ['pizza1', 'pizza2', 'pizza1']
pizza_price = sum(pizzas_with_prices[pizza] for pizza in pizza_list)

【讨论】：

【解决方案2】：

我认为变量 Pizza 必须是一个列表而不是整数。不确定您是否没有在上面的 sn-p 中指出它，或者它是否有错误。但这应该可行 -

pizzas_with_prices = [("Hawaiian", 8.5), ("Veg Deluxe", 8.5), ("Ham and Cheese", 8.5),("Super Supreme", 8.5), ("Seafood Deluxe", 8.5),("Meatlovers", 11.5), ("Hot 'n' Spicy", 11.5), ("BBQ Chicken and Bacon", 11.5),("Satay Chicken", 11.5)]
selected_pizzas = []
for n in range(len(pizzas_with_prices)):
    pizza = int(input("Choose a Pizza:"))
    selected_pizzas.append(pizza)

pizza_price=0.0
for n in selected_pizzas:
    pizza_price += pizzas_with_prices[n][1]

这不是你要找的吗？

在您的新代码中，缺少的只是：

total_price = 0
for selected in pizza:
    total_price += pizzas_with_prices[selected][1]
    **print("%s" % (pizzas_with_prices[selected][0]))**
    print("$%s" % (total_price))

【讨论】：