Python代码帮助！代码学院没用

Question

Code and instructions found here

 shopping_list = ["banana", "orange", "apple"]

stock = {
    "banana": 6,
    "apple": 0,
    "orange": 32,
    "pear": 15
}

prices = {
    "banana": 4,
    "apple": 2,
    "orange": 1.5,
    "pear": 3
}

# Write your code below!
def compute_bill(food):
    total = 0
    for item in food:
        total += item
    return total

上面是我的代码，我知道它需要找到值，但即使我尝试食品.价值观（）它给出了一个错误。我怎样才能做到这一点？你知道吗

谢谢

Answer 1

你应该把你的代码作为代码/文本，而不是图片！ 不管怎样，一个没有任何检查/验证的非常原始的实现应该是这样的：

def computer_bill(food):
    total = 0.0
    for i in food:
        if i in prices:
            total += float(prices[i])
    return total


stock = {
"banana": 6,
"apple": 0,
"orange": 32,
"pear": 15
}

prices = {
"banana": 4,
"apple": 2,
"orange": 1.5,
"pear": 3
}

print "   -"
lfood = ["banana","orange"]
print "total is:", computer_bill(lfood)

输出：

总计：5.5