Getting values from JSON using Python

问题:

While I am trying to retrieve values from JSON string, it gives me an error:

data = json.loads('{"lat":444, "lon":555}')
return data["lat"]

But, if I iterate over the data, it gives me the elements (lat and lon), but not the values:

data = json.loads('{"lat":444, "lon":555}')
    ret = ''
    for j in data:
        ret = ret + ' ' + j
return ret

Which returns: lat lon

What do I need to do to get the values of lat and lon? (444 and 555)

回答1:

If you want to iterate over both keys and values of the dictionary, do this:

for key, value in data.items():
    print key, value

回答2:

What error is it giving you?

If you do exactly this:

data = json.loads('{"lat":444, "lon":555}')

Then:

data['lat']

SHOULD NOT give you any error at all.

回答3:

Using Python to extract a value from the provided Json

Working sample:-

import json
import sys

//load the data into an element
data={"test1" : "1", "test2" : "2", "test3" : "3"}

//dumps the json object into an element
json_str = json.dumps(data)

//load the json to a string
resp = json.loads(json_str)

//print the resp
print (resp)

//extract an element in the response
print (resp['test1'])

回答4:

There's a Py library that has a module that facilitates access to Json-like dictionary key-values as attributes: https://github.com/asuiu/pyxtension You can use it as:

j = Json('{"lat":444, "lon":555}')
j.lat + ' ' + j.lon

回答5:

Using your code, this is how I would do it. I know an answer was chosen, just giving additional options.

data = json.loads('{"lat":444, "lon":555}')
    ret = ''
    for j in data:
        ret = ret+" "+data[j]
return ret

When you use for in this manor you get the key of the object, not the value, so you can get the value, by using the key as an index.