在Python中遍历JSON列表时出现问题？

Question

我有一个包含JSON数据的文件，如下所示：

{
    "Results": [
            {"Id": "001",
            "Name": "Bob",
            "Items": {
                "Cars": "1",
                "Books": "3",
                "Phones": "1"}
            },

            {"Id": "002",
            "Name": "Tom",
            "Items": {
                "Cars": "1",
                "Books": "3",
                "Phones": "1"}
            },

            {"Id": "003",
            "Name": "Sally",
            "Items": {
                "Cars": "1",
                "Books": "3",
                "Phones": "1"}
            }]
}

我不知道如何正确地循环JSON。我想循环遍历数据，并得到数据集中每个成员的Cars名称。我怎样才能做到这一点？

import json

with open('data.json') as data_file:
    data = json.load(data_file)

print data["Results"][0]["Name"] # Gives me a name for the first entry
print data["Results"][0]["Items"]["Cars"] # Gives me the number of cars for the first entry

我试着用以下方法循环它们：

for i in data["Results"]:
print data["Results"][i]["Name"]    

但收到一个错误： 类型错误：列表索引必须是整数，而不是dict

Answer 1

假设i是索引，但它是字典，请使用：

for item in data["Results"]:
    print item["Name"]    

引用for Statements：

The for statement in Python differs a bit from what you may be used to in C or Pascal. Rather than always iterating over an arithmetic progression of numbers (like in Pascal), or giving the user the ability to define both the iteration step and halting condition (as C), Python’s for statement iterates over the items of any sequence (a list or a string), in the order that they appear in the sequence.