Python 你能解释一下吗，我的一节课

我在codecademy上学习代码。当我在其中编码时，我没有得到练习的解决方案，我单击了给我解决方案选项 我得到了解决方案，因为我不理解程序。程序是这样的

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

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

for food in prices:
  print food
  print "price: %s" % prices[food]
  print "stock: %s" % stock[food]

然后打印出来

orange
price: 1.5
stock: 32
pear
price: 3
stock: 15
banana
price: 4
stock: 6
apple
price: 2
stock: 0

你能解释一下这个过程吗。

---

它如何打印上面给出的输出

了解这个问题会很有帮助。但我可以尝试在不知道问题的情况下，从高层次上解释这个项目

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

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

这是两本词典的定义，第一本词典只存储每个水果的价格，第二本词典存储仓库（库存）中有多少水果

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顺便说一下，这看起来像Python2语法，因为

print

语句中没有括号。我强烈建议您学习Python 3

您有两本词典，分别名为

价格

和

股票

prices = {"banana": 4,"apple": 2,"orange": 1.5,"pear": 3}
stock = {"banana": 6, "apple": 0, "orange": 32, "pear": 15}

您正在迭代

价格
的
键
，
dict by
获取食品价格：
此行

阅读此代码的注释：

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

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

for food in prices: #iterate over the keys of prices dict
  print food #print the key
  print "price: %s" % prices[food] #print the value of prices dict at food key
  print "stock: %s" % stock[food] #print the value of stock dict at food key

但在这个项目中，你到底不清楚什么？
prices = {"banana": 4,"apple": 2,"orange": 1.5,"pear": 3} #prices dict

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

for food in prices: #iterate over the keys of prices dict
  print food #print the key
  print "price: %s" % prices[food] #print the value of prices dict at food key
  print "stock: %s" % stock[food] #print the value of stock dict at food key