在Python中从JSON文件读取

Question

The variable data has the following JSON

{
   "destination_addresses" : [ "Stade Leopold Sedar Senghor, Route de Yoff, Dakar, Senegal" ],
   "origin_addresses" : [ "Unnamed Road, Dakar, Senegal" ],
   "rows" : [
      {
         "elements" : [
            {
               "distance" : {
                  "text" : "13.0 km",
                  "value" : 13007
               },
               "duration" : {
                  "text" : "23 mins",
                  "value" : 1383
               },
               "status" : "OK"
            }
         ]
      }
   ],
   "status" : "OK"
}

I then run the following code:

parsed =  json.loads(data)

I want to store distance "text" and "value", and duration "text" and "value" and "status" into variables in python. I tried the following code but it did not work:

dist = int(parsed['rows']['elements']['distance']['value'])

But I am getting an error

Answer 1

键行和元素是列表，因此您需要指定一个索引：

dist = int(parsed['rows'][0]['elements'][0]['distance']['value'])

Answer 2

Here you have working code. I have just changed a bit and it works fine. The access to dictionary it a little bit confusing. I will try to explain. The json.dumps serialize a str to a json obj. Here for more information. json.dumps

 data ={
   "destination_addresses" : [ "Stade Leopold Sedar Senghor, Route de Yoff, Dakar, Senegal" ],
   "origin_addresses" : [ "Unnamed Road, Dakar, Senegal" ],
   "rows" : [
      {
         "elements" : [
            {
               "distance" : {
                  "text" : "13.0 km",
                  "value" : 13007
               },
               "duration" : {
                  "text" : "23 mins",
                  "value" : 1383
               },
               "status" : "OK"
            }
         ]
      }
   ],
   "status" : "OK"
}


data_string = json.dumps(data)
parsed =  json.loads(data_string)

print parsed['rows'][0]['elements'][0]['distance']['text']

When you have a list into a dictionary first of all you have to refer the index(an integer) that you want to access and then the dictionary index with the name('string'). As you can see in the last line of the code.