python - 解析 JSON 时字符串索引必须是整数 - python

Question

我是 python 的新手，遇到这个错误:string indices must be integers while parsing a JSON file.

JSON 文件:

{"NFLTeams": [
  {"code":"ARI","fullName":"Arizona Cardinals","shortName":"Arizona"},
  {"code":"ATL","fullName":"Atlanta Falcons","shortName":"Atlanta"},
  {"code":"WAS","fullName":"Washington Redskins","shortName":"Washington"}
]}

我的代码:

import urllib.request as ur
import urllib.parse
import json

url = 'http://www.fantasyfootballnerd.com/service/nfl-teams/json/test/'
user_agent = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64)'
values = {'name' : 'Michael Foord',
          'location' : 'Northampton',
          'language' : 'Python' }
headers = { 'User-Agent' : user_agent }

data = urllib.parse.urlencode(values)
data = data.encode('ascii')
req = urllib.request.Request(url, data, headers)
response = urllib.request.urlopen(req)
the_page = response.read().decode('utf-8')

print (the_page)
team_data = json.loads(the_page)

print (type(team_data))  // team_data is type dict

for item in team_data:
    print (item['NFLTeams'][0]["code"])
    print (item['NFLTeams'][0]['fullName'])
    print (item['NFLTeams'][0]['shortName'])

我尝试打印以下内容:

print (item['NFLTeams']["code"]) 

还有这个:

for item in team_data['NFLTeams'].values():
    print (item["code"])
    print (item['fullName'])
    print (item['shortName'])

这给了我这个错误:

for item in team_data['NFLTeams'].values():
AttributeError: 'list' object has no attribute 'values'

谁能帮我弄清楚这是怎么回事？谢谢。

Answer 1

.values() 用于循环遍历字典的值，但是，team_data['NFLTeams'] 是一个列表，其中包含字典。因此，您需要删除 .values() 以在迭代时访问每个字典:

for item in team_data['NFLTeams']:
    print (item["code"])
    print (item['fullName'])
    print (item['shortName'])

如果你真的想使用.values():

for item in team_data.values()[0]:
    print (item["code"])
    print (item['fullName'])
    print (item['shortName'])

请记住 .values() 返回 view object在 Python 3.x 中，因此您需要使用 list() 强制对其进行评估，以便按索引访问元素:

for item in list(team_data.values())[0]: