Python和JSON-TypeError列表索引必须是整数而不是str

问题描述

我正在学习使用Python和API(特别是此世界杯API， http://www.kimonolabs.com/worldcup /explorer )

I am learning to use Python and APIs (specifically, this World Cup API, http://www.kimonolabs.com/worldcup/explorer)

JSON数据如下:

[
  {
    "firstName": "Nicolas Alexis Julio",
    "lastName": "N'Koulou N'Doubena",
    "nickname": "N. N'Koulou",
    "assists": 0,
    "clubId": "5AF524A1-830C-4D75-8C54-2D0BA1F9BE33",
    "teamId": "DF25ABB8-37EB-4C2A-8B6C-BDA53BF5A74D",
    "id": "D9AD1E6D-4253-4B88-BB78-0F43E02AF016",
    "type": "Player"
  },

 {
    "firstName": "Alexandre Dimitri",
    "lastName": "Song-Billong",
    "nickname": "A. Song",
    "clubId": "35BCEEAF-37D3-4685-83C4-DDCA504E0653",
    "teamId": "DF25ABB8-37EB-4C2A-8B6C-BDA53BF5A74D",
    "id": "A84540B7-37B6-416F-8C4D-8EAD55D113D9",
    "type": "Player"
  },
   ]

我只是在尝试打印此API中的所有名字.这就是我所拥有的:

I am simply trying to print all of the firstNames in this API. Here's what I have:

import urllib2
import json

url = "http://worldcup.kimonolabs.com/api/players?apikey=xxx"
json_obj = urllib2.urlopen(url).read
readable_json = json.dumps(json_obj)
playerstuff = readable_json['firstName']
for i in playerstuff:
    print i['firstName']

但是，当我运行它时，出现错误"... TypeError，... TypeError:列表索引必须是整数，而不是str"

But when I run it, I get the error "...line 8, in ...TypeError: list indices must be integers, not str"

我一直在寻找解决方案，但是似乎发现了更多更深入"的API问题，但我还不是很了解，因此对我需要做的任何帮助或解释都将是惊人的.谢谢！

I have looked around for solutions, but seem to find questions to more "in depth" API questions and I don't really understand it all yet, so any help or explanation as to what I need to do would be amazing. Thank you!

推荐答案

首先，您应该使用json.loads，而不是json.dumps. loads将JSON源文本转换为Python值，而dumps则相反.

First of all, you should be using json.loads, not json.dumps. loads converts JSON source text to a Python value, while dumps goes the other way.

解决此问题后，根据问题顶部的JSON代码段，readable_json将成为列表，因此readable_json['firstName']没有意义.获取列表中每个元素的'firstName'字段的正确方法是消除playerstuff = readable_json['firstName']行并将for i in playerstuff:更改为for i in readable_json:.

After you fix that, based on the JSON snippet at the top of your question, readable_json will be a list, and so readable_json['firstName'] is meaningless. The correct way to get the 'firstName' field of every element of a list is to eliminate the playerstuff = readable_json['firstName'] line and change for i in playerstuff: to for i in readable_json:.

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