I have troubleshooting some code that uses HTTP POST to send data and should return a JSON result whose contents are a dictionary. I am using an XML-RPC wrapper to expose this service. When the wrapper receives the dict information from the http response variable, the dict contents are in a string in this form:
{'created': datetime.datetime(2010, 12, 31, 19, 13, 8, 379909), 'worker': u'GoogleWorker', 'ready': False, 'request_id': '8f1381853a444a42a37ae5152a3af947', 'owner': u'admin', 'shortname': u'test19'}
I'm trying to convert the string below into a JSON result using the following statement:
result = json.loads(response[1])
However, when I try to use json.loads to convert the data to JSON, I get the following error: Fault: <Fault 1: "<type 'exceptions.ValueError'>:Expecting property name: line 1 column 1 (char 1)">
I manually tried to convert the above string to JSON, but I get the same error. Is the dict malformed in some way? Is it due to unicode? I also tried setting the locale to UTF-8, but that was unsuccessful.
Any help would be greatly appreciated.
You are trying to use the wrong method. json.loads is for loading JSON to Python. If you want to convert Python to JSON, you need json.dumps.
result = json.dumps(response[1])
That dict is in Python dict literal format, not JSON. You can do:
import ast
result = ast.literal_eval(response[1])
to read in the response in that format. Are you sure that Django hasn't already JSON-decoded the response?
i have use json on django , i use this :
import simplejson as json
#to encode
final= {'first':first_data,'second':second_data}
json.dumps(final)
#to decode this is the example from python's api
json.loads('["foo", {"bar":["baz", null, 1.0, 2]}]')
Related
I am scraping one web site which has javascript json object. How can i convert that javascript json object to pure json object. I need JSON.stringfy method like javascript. How can i do that on python.
{
title: 'Erkek Gri Sandalet',
description: '<ul><li>Asıl Dış Materyal: Suni Deri</li><li>İç Materyal: Suni Deri</li><li>Taban Materyali: Kauçuk Taban</li></ul>',
url: '/erkek-gri-sandalet-3500250',
code: 'C-362686',
id: '3500250'
}
i am getting an error when passing above string into the json.loads() The error is
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)
How can i convert to this javascript json object to native json. I used https://www.freeformatter.com/json-formatter.html website to validate above json and that website validate and converted native JSON easily.
You could do something funky with regular expressions, but actually you should take advantage of the fact that even though this is not valid JSON, it is valid YAML. Install PyYAML and you can just do yaml.load(data).
I am trying to pass a JSON object as an argument to a python2 script, it works but the final json data has a single quote (') enclosing the object.
Below is my code
import json
import sys
print sys.argv[1]
data_str = sys.argv[1].decode('string-escape')
print data_str
# The above print's fine with no single quotes
json_data= {
"server-name": "servername",
"transaction-id": "transaction_id",
"user-id": "user_id",
"change-id": "change_id",
"consumer-name": "consumer_name",
"platform": "platform",
"cookbooks": [
{
"cookbook-name": "cookbook_name",
"cookbook-version": "cookbook_version",
"recipe-name": "receipie_name",
"attributes": {
}
}
]
}
json_data["cookbooks"][0]["attributes"] = data_str.decode('string-escape')
print json_data["cookbooks"]
Execution
C:\Python26\python.exe saver.py "{apple:newf,mango:newb}"
{apple:newf,mango:newb}
{apple:newf,mango:newb}
[{'cookbook-name': 'cookbook_name', 'cookbook-version': 'cookbook_version', 'recipe-name': 'receipie_name', 'attributes': '{apple:newf,mango:newb}'}]
From the above output the final json_data contains quotes in the attribute value
'attributes': '{apple:newf,mango:newb}' which is causing error in my GET call.
How to escape this single quote. ?
Forgive me if I'm wrong but I think you've got mixed up with converting the argument string type and decoding a json string.
The single quotes in your result means that the entire value is a string.
Firstly the argument you are passing in on the command line isn't valid JSON.
Try starting your program like this:
C:\Python26\python.exe saver.py "{\"apple\":\"newf\",\"mango\":\"newb\"}"
Then later decode the JSON contained in the string like this:
json_data["cookbooks"][0]["attributes"] = json.loads(data_str)
i.e. json.loads and not str.decode
at this point the variable "json_data" isn't holding JSON it's holding a dictionary
You would then have to encode the entire of json_data to pass it in some raw form of http GET unless you have some API doing it for you. Something like
encoded_json_data = json.dumps(json_data)
If you want to work with JSON then use the json module built in to your Python. Don't try to fudge the issue by treating it as Python string data when it isn't.
import json
then:
json_data["cookbooks"][0]["attributes"] = json.loads(sys.argv[1])
Then if you want to output your Python data structure as json:
print(json.dumps(json_data["cookbook"]))
I'm newbie in python and trying to parse data in my application using these lines of codes
json_str = request.body.decode('utf-8')
py_str = json.loads(json_str)
But I'm getting this error on json.loads
Expecting value: line 1 column 1 (char 0)
this is json formatted data that I send from angular app (Updated)
Object { ClientTypeId: 6, ClientName: "asdasd", ClientId: 0, PhoneNo: "123", FaxNo: "123", NTN: "1238", GSTNumber: "1982", OfficialAddress: "sads", MailingAddress: "asdasd", RegStartDate: "17-Aug-2016", 15 more… }
these are the values that I get in json_str
ClientTypeId=5&ClientName=asdasd&ClientId=0&PhoneNo=123&FaxNo=123&NTN=123&GSTNumber=12&OfficialAddress=adkjh&MailingAddress=adjh&RegStartDate=09-Aug-2016&RegEndDate=16-Aug-2016&Status=1&CanCreateUser=true&UserQuotaFor=11&UserQuotaType=9&MaxUsers=132123&ApplyUserCharges=true&ApplyReportCharges=true&EmailInvoice=true&BillingType=1&UserCharges=132&ReportCharges=123&MonthlyCharges=123&BillingDate=16-Aug-2016&UserSessionId=324
I don't know what's wrong in it.. can anyone mention what's the mistake is??
Your data is not JSON-formatted, not even the one you included in your updated answer. Your data is a JavaScript-object, not an encoded string. Please note the "N" in JSON: Notation -- it is a format inspired from how data is written in JavaScript code, but runtime JavaScript data is not represented in JSON. The "JSON" you pasted is how your browser represents the object to you, it is not proper JSON (that would be {"ClientTypeId": 6, ...} -- note the quotes around the property name).
When sending this data to the server, you have to encode it. You think you are sending it JSON-encoded, but you aren't. You are sending it "web form encoded" (data of type application/x-www-form-urlencoded).
Now either you have to learn how to send the data in JSON format from Angular, or use the correct parsing routine in Python: urllib.parse.parse_qs. Depending on the library you are using, there might be a convenience method to access the data as well, as this is a common use case.
I am currently trying to create a dictionary from a json formatted server response:
{"id": null,{"version": "1.1","result": "9QtirjtH9b","error": null}}
Therefore I am using json.loads(). But I always get the following error:
ValueError: Expecting property name: line 1 column 12 (char 12)
I know that this means that there is an error in the json syntax and I found some threads (like this one) here at stackoverflow, but they did not include an answer that solved my problem.
However, I was not sure if the null value within the json response causes the error, so I had a closer look at the json.org Reference Manual and it seems to be a valid syntax. Any ideas?
It's not valid. The outer object needs a property name for the second element; raw values are not valid in an object.
{"id": null, "somename":{"version": "1.1","result": "9QtirjtH9b","error": null}}
The problem here is the lack of a key for the nested object, not the null. You'd need to find a way to fix that syntax or parse it yourself.
If we make a few assumptions about the syntax, you should be able to use a regular expression to fix the JSON data before decoding:
import re
from itertools import count
def _gen_id(match, count=count()):
return '{1}"generated_id_{0}":{2}'.format(next(count), *match.groups())
_no_key = re.compile(r'(,)({)')
def fix_json(json_data):
return _no_key.sub(_gen_id, json_data)
This assumes that any ,{ combo indicates the location of a missing key, and generates one to insert there. That is a reasonable assumption to make, but may break things if you have string data with exactly that sequence.
Demo:
>>> json_data = '{"id": null,{"version": "1.1","result": "9QtirjtH9b","error": null}}'
>>> fix_json(json_data)
'{"id": null,"generated_id_0":{"version": "1.1","result": "9QtirjtH9b","error": null}}'
>>> json.loads(fix_json(json_data))
{u'id': None, u'generated_id_1': {u'version': u'1.1', u'result': u'9QtirjtH9b', u'error': None}}
I'm trying to use Facebook's REST api, and am encoding a JSON string/dictionary using urllib.urlencode. The result I get however, is different from the correct encoded result (as displayed by pasting the dictionary in the attachment field here http://developers.facebook.com/docs/reference/rest/stream.publish/). I was wondering if anyone could offer any help.
Thanks.
EDIT:
I'm trying to encode the following dictionary:
{"media": [{"type":"flash", "swfsrc":"http://shopperspoll.webfactional.com/media/flashFile.swf", "height": '100', "width": '100', "expanded_width":"160", "expanded_height":"120", "imgsrc":"http://shopperspoll.webfactional.com/media/laptop1.jpg"}]}
This is the encoded string using urllib.urlencode:
"media=%5B%7B%27swfsrc%27%3A+%27http%3A%2F%2Fshopperspoll.webfactional.com%2Fmedia%2FflashFile.swf%27%2C+%27height%27%3A+%27100%27%2C+%27width%27%3A+%27100%27%2C+%27expanded_width%27%3A+%27160%27%2C+%27imgsrc%27%3A+%27http%3A%2F%2Fshopperspoll.webfactional.com%2Fmedia%2Flaptop1.jpg%27%2C+%27expanded_height%27%3A+%27120%27%2C+%27type%27%3A+%27flash%27%7D%5D"
It's not letting me copy the result being thrown out from the facebook rest documentation link, but on copying the above dictionary in the attachment field, the result is different.
urllib.encode isn't meant for urlencoding a single value (as functions of the same name are in many languages), but for encoding a dict of separate values. For example, if I had the dict {"a": 1, "b": 2} it would produce the string "a=1&b=2".
First, you want to encode your dict as JSON.
data = {"media": [{"type":"flash", "swfsrc":"http://shopperspoll.webfactional.com/media/flashFile.swf", "height": '100', "width": '100', "expanded_width":"160", "expanded_height":"120", "imgsrc":"http://shopperspoll.webfactional.com/media/laptop1.jpg"}]}
import json
json_encoded = json.dumps(data)
You can then either use urllib.encode to create a complete query string
import urllib
urllib.encode({"access_token": example, "attachment": json_encoded})
# produces a long string in the form "access_token=...&attachment=..."
or use urllib.quote to just encode your attachment parameter
urllib.quote(json_encoded)
# produces just the part following "&attachment="