Php 如何在python中访问深层JSON属性

这段PHP代码可以工作（下面是json）：

我在python中也尝试过这样做，但它给了我

：字符串索引必须是整数

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

我的数据结构如下：

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

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

那么如何在python中访问zipcodes呢

for state in usaData.USA.States:

或者可能是，取决于结构：

for state in usaData.USA.States.all():

编辑：不漂亮，可能需要清理，但这应该可以：

for state in usaData['USA']['States'].keys():
    for cities in usaData['USA']['States'][state]['Cities']:
        print cities['zipcode']

或者可能是，取决于结构：

for state in usaData.USA.States.all():

编辑：不漂亮，可能需要清理，但这应该可以：

for state in usaData['USA']['States'].keys():
    for cities in usaData['USA']['States'][state]['Cities']:
        print cities['zipcode']

---

您的问题是，在字典上迭代得到的是键，而不是字典中的值。所以你需要的是：

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

非常难看

更好的版本是使用字典上的

items

函数，如下所示：

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

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

---

您的问题是，在字典上迭代得到的是键，而不是字典中的值。所以你需要的是：

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

非常难看

更好的版本是使用字典上的

items

函数，如下所示：

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

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

---

“dict”对象没有属性“USA”

这是另一件奇怪的事情。我还以为USA和States是属性。

“dict”对象没有属性“USA”

，这是另一件奇怪的事情。我还以为美国和各州是属性。我得到：

：“list”对象没有属性“items”

Ah oops。这是因为城市是一个列表，而不是一个目录。我会解决它。我得到：

：“list”对象没有属性“items”

啊，糟糕。那是因为城市是一个列表，而不是一个目录。我会修正它。