Question

我正在学习Python，而我正在尝试制作购物车（用于练习）。但我有点卡在这里：

# Vars
budget = 200; # Budget
total = 0; # Total price
prices = { # Price list
    "cola":22,
    "chips":18,
    "headset":800,
    "pencil":5
}
cart = [] # Shopping cart

while True:
    cmd = raw_input("Enter command: ");
    if cmd == "additem":

在while循环中（特别是“if cmd ==”additem“）我想让用户输入一个项目的名称（来自价格字典）然后将它添加到购物车中。但是，我不是确定如何解决这个问题。

Answer 1

作业？

您的数据结构有点奇怪。您可能希望购物车成为元组或其他内容的列表，每个元组都是项目，数量，甚至是项目，数量，小计。然而。

if cmd == "additem":
    item = raw_input("Enter item name: ")
    cart.append(item)

#at the end
for item in cart:
    print "Item: %s. Price: %s" % (item, prices[item])

Answer 2

# Vars
budget = 200; # Budget
total = 0; # Total price
prices = { # Price list
    "cola":22,
    "chips":18,
    "headset":800,
    "pencil":5
}
cart = [] # Shopping cart

input = ['']
while input[0] != 'quit':
    input = raw_input("Enter command: ").split()
    if input[0] == 'additem' and input[1] in prices:
        cart.append(input[1])

Answer 3

# Vars
budget = 200; # Budget
total = 0; # Total price
prices = { # Price list
    "cola":22,
    "chips":18,
    "headset":800,
    "pencil":5
}
cart = [] # Shopping cart
cmd = raw_input("""
====Item=====Price====

    cola    :  22 $
    chips   :  18 $
    headset : 800 $
    pencil  :   5 $

Enter order:""")
while cmd in prices.keys():
    cart+=[(cmd,prices[cmd])]
    cmd = raw_input("Enter order: ")

if cmd not in ["","\t","\n"]:
    print cmd," is not available",

print"you cart contains :\n"
if cart != []:
    for item in cart:
        print item[0],"\t:",item[1]," $"
else:
    print "Nothing"

raw_input("\nPress enter to exit...")

用Python制作购物车

3 个答案: