Python's json.load(sys.stdin) gets me u'...' instead of double quotes around Strings

Question

When I do:

import sys, json;
import requests

headers = {'Content-Type': 'application/json',
       'X-Parse-Application-Id': '...',
       'X-Parse-REST-API-Key': '...'}

data = json.load(sys.stdin)
for station in data["data"]:
    print station
    res = requests.post('https://api.parse.com/1/classes/test4', data=station, headers=headers)

I get

{u'city': u'London',
...
}

And it's not a valid Json as when I try to POST it to Parse.com I'm getting

{"code":107,"error":"invalid JSON"}

and any JSON validator gives me Error:Strings should be wrapped in double quotes.

How to make a valid JSON of the data?

Answer 1

print will just print python's representation of the object you are passing (which you deserialized with json.load). Try this:

import sys, json;
data = json.load(sys.stdin)
for station in data["data"]:
    print(json.dumps(station))

json.dumps serializes a python object back to json.

Answer 2

You've misunderstood what json.load does: it deserializes from JSON, ie it creates Python objects from JSON strings.

But I can't really understand what you're doing; if you already have JSON being passed in from stdin, why are you trying to convert it at all? Pass it straight on to your API.