php - 如何在 python 中访问深层 JSON 属性

Question

此 PHP 代码有效(下面的 json):

$usaData = json_decode(stripslashes(file_get_contents('usaJson.txt')),true);
foreach($usaData['USA']['States'] as $state){
    foreach($state['Cities'] as $city){
            $zipCode = $city['zipcode'];
        }
    }
}

我尝试在 python 中做同样的事情，但它给了我 <type 'exceptions.TypeError'>: string indices must be integers

usaData = json.loads(get_file('usaJson.txt'))
for state in usaData['USA']['States']:
    for city in state['Cities']:
        zipCode = city['zipcode']

我的数据结构是这样的:

{
  "USA":{
    "States":{
      "AL":{
        "Cities":[
          {
            "city":"auburn",
            "zipcode":"36830"
          },
          {
            "city":"birmingham",
            "zipcode":"35201"
          }
        ]
      },
      "AK":{
        "Cities":[
          {
            "city":"anchorage",
            "zipcode":"99501"
          },
          {
            "city":"fairbanks",
            "zipcode":"99701"
          }
        ]
      }
    }
  }
}

那么如何在 python 中访问邮政编码？

Answer 1

你的问题是迭代字典给你的是键，而不是字典中的值。所以你需要的是这样的:

for state_name in usaData['USA']['States']
  for city in usaData['USA']['States'][state_name]['Cities']
    print city['zipcode']

实在是太丑了

更好的版本是在字典上使用 items 函数，如下所示:

for state_name, state in usaData['USA']['States'].items():
  for city in state['Cities']
    print city['zipcode']