Question

我正在为我的决赛学习，这是我错过的一个测验问题。我需要getTotal方法的大部分帮助。我需要遍历列表，查找每个项目的价格，将价格添加到总计并返回总计。我在循环中挣扎，我不知道如何将第二项从列表中拉出来。[1] ??我尝试过很多方法而且感到很沮丧。

如果有人愿意帮助我，那会很棒。我还在学习并且是新手，所以对我很轻松，但我真的想学习它。它可能没有我想象的那么难，但我会等待一些输入。谢谢！

class Item: 
    def __init__(self, name, price):
        self.name = name
        self.price = price

    def getPrice(self):
        return self.price

    def getName(self):
        return self.name

class Cart:
    def __init__(self, list):
        self.list = []

    def addItem(self, item):
        self.list.append(self.list)

    def getTotal(self):
        total = 0
        for item in self.list:
            name, price = item # or price = item[1]
            total = total + price

    def getNumItems(self):
        count = 0
        for c in range(self.list):
            count = self.list + 1
            return count

    def removeItem(self, item)
        #removes the item from the cart's item list

def main():
    item1 = Item("Banana", .69)
    item2 = Item("Eggs", 2.39)
    item3 = Item("Donut", .99)
    c = Cart()
    c.addItem(item1)
    c.addItem(item2)
    c.addItem(item3)
    print "You have %i items in your cart for a total of $%.02f" %(c.getNumItems(), c.getTotal())
    c.removeItem(item3)
    print "You have %i items in your cart for a total of $%.02f" % (c.getNumItems(), c.getTotal())
main()

Answer 1

for getTotal：

def getTotal(self):
    total = 0
    for item in self.list:
        name, price = item # or price = item[1]
        total = total + price

BTW，您的addItem和getNumItems方法也是错误的。由于它是最终的，你应该试着了解你正在做什么。

Answer 2

这里给出了时间，我更改了代码，现在它是功能齐全的购物车

class Item(object): 
    def __init__(self, unq_id, name, price, qty):
        self.unq_id = unq_id
        self.product_name = name
        self.price = price
        self.qty = qty


class Cart(object):
    def __init__(self):
        self.content = dict()

    def update(self, item):
        if item.unq_id not in self.content:
            self.content.update({item.unq_id: item})
            return
        for k, v in self.content.get(item.unq_id).iteritems():
            if k == 'unq_id':
                continue
            elif k == 'qty':
                total_qty = v.qty + item.qty
                if total_qty:
                    v.qty = total_qty
                    continue
                self.remove_item(k)
            else:
                v[k] = item[k]

    def get_total(self):
        return sum([v.price * v.qty for _, v in self.content.iteritems()])

    def get_num_items(self):
        return sum([v.qty for _, v in self.content.iteritems()])

    def remove_item(self, key):
        self.content.pop(key)


if __name__ == '__main__':
    item1 = Item(1, "Banana", 1., 1)
    item2 = Item(2, "Eggs", 1., 2)
    item3 = Item(3, "Donut", 1., 5)
    cart = Cart()
    cart.update(item1)
    cart.update(item2)
    cart.update(item3)
    print "You have %i items in your cart for a total of $%.02f" % (cart.get_num_items(), cart.get_total())
    cart.remove_item(1)
    print "You have %i items in your cart for a total of $%.02f" % (cart.get_num_items(), cart.get_total())

输出是：

You have 8 items in your cart for a total of $8.00
You have 7 items in your cart for a total of $7.00

Answer 3

这是一个简单的程序，尝试一下。

#MINI SHOPPING CLI PROGRAM 
import time
import random

item = ["Laptop","T-Shirt","Pants"] #You may add your own items
cost = ["Rs 35600","Rs 2000","Rs 1200"] #You may add your own price of your items but make sure you update the program necessarily. 
x = []
l = []
print()
for i,j in zip(item,cost):
    print(i,"=",j)
    print()
choice = 'y' or 'n'
count = 0

while choice == 'y' or choice == 'YES' or choice == 'yes' or choice =='Y':
    print()
    user_1 = input("Enter the name of the item which you would like to purchase : ")
    print()    
    user_2 = int(input("Enter the cost of the item which you would like to purchase : {} ".format("Rs")))
    print()
    if user_2 == 35600 or user_2 == 2000 or user_2 == 1200:
        l.append(user_2)
    else:
        print()
        print("DONT CHEAT. ABOTING IN 5 SECONDS.")
        time.sleep(5)
        break
    if user_1 in item:
        x.append(user_1)
        print()
        print(user_1,"has been added to your cart.")
        print()
        count += 1
    else:
        print()
        print("Item not found.Try restarting the app.")
    choice = input("Do you want to add any other item to your cart : ")

while choice == 'n' or choice == 'no' or choice == 'NO' or choice == 'N':
    print()
    print("There are",count,"items in your cart")
    print()
    print("Total : {}".format("Rs"),sum(l))
    print()
    user_4 = input("Proceed to checkout (y/n) : ")
    if user_4 == 'n':
        print()
        print("ABORTING IN 5 SECONDS")
        time.sleep(5)
        break
    else:
        print()
        user_5 = input("Select payment method (Credit/Debit) : ")
        print()
        print("PROCESSING")
        r = 0
        while r <= 2:
            print(".")
            time.sleep(1)
            r += 1
        print()
        print("GENERATING CAPTCHA")
        b = 0
        while b <= 3:
            print(".")
            time.sleep(1)
            b += 1
        print()
        print("Enter the captcha given below.")
        print()
        captcha = random.randint(111111,999999)
        print(captcha)
        print()
        user_6 = input()
        if user_6 != captcha:
            "ABORTING IN 5 SECONDS."
        else:
            continue
        f = 0
        print()
        print("AWAITING IMFORMATION.")
        while f <= 5:
            print(".")
            time.sleep(1)
            f += 1
        print()
        print("TRANSACTION SUCCESSFUL.")
        print()
        print("Thank You for choosing Muhammed©")
        break

Python购物车添加到购物车，获取总获取数量的项目

3 个答案: