parameterizing python POST request containing JSON body

Question

I'm creating a Phyton script to POST a request which contains JSON BODY, This is the JSON input I need to pass in the body of the request :

{
   "Name": "PServiceGroup125",
   "ServiceIDs": [1330,2387]
}

I'm able to do this(it works) :

   body = "{\"Name\": \"PServiceGroup125\",\"ServiceIDs\": [1330,2387]}"
   headers = [ NVPair('Content-Type', 'application/json'), NVPair('UAMToken', uamtok) ]
   response = self.httpPost(self.hostPort, self.URI, headers, body)

What I'm trying to achieve: ( to make it more "OO")

To create a function(say createBody ) to create a python object and then convert this python object into JSON and pass it in the request:

def createBody(self):
    self.serviceDataProvider.setName("PTestServiceGroup %s" % time.strftime("%d%m%H%M%S"))
    self.serviceDataProvider.setServiceIDs(self.serviceDataProvider.nextItem())

I have two questions here :

Here I set the "value" for the corresponding json name and service ID field, how should I set the name field(ServiceIDs)? ( "ServiceIDs": [1330,2387] )

Assuming that the "serviceDataProvider" object has been created successfully(with Name and ServiceID values ) .

how should i convert this object(serviceDataProvider) back to JSON and pass it in the request ?

I'm looking at the 'json' module , but not very clear on how to use it for this scenario

Anyones help and suggestion is appreciated !

# serviceDataProvider is object of class ServiceDataProvider 

class ServiceDataProvider(URLDataProvider):
    name =""
    sid=''
    sIDs=[]
    def setName(self,name):
        self.name=name

    def getName(self):
        return self.name

    def setServiceIDs(self,sid):
        sIDs=[]
        sIDs.append(sid)

    def getServiceIDs(self):
        return self.sIDs

Daniel Roseman · Accepted Answer · 2014-09-19 14:50:08Z

1

This is all a bit over-engineered, and not really very Pythonic: at a guess, your previous experience is in Java...

There's not really any need for a class here, and even less for those getter/setters. It would be better to build this up as a Python dictionary, which can then be converted directly into JSON.

body = {}
body['Name'] = "PTestServiceGroup %s" % time.strftime("%d%m%H%M%S")
body['ServiceIds'] = [service_id1, service_id2]  # wherever these come from

data = json.dumps(body)

answered Sep 19, 2014 at 14:50

Daniel Roseman

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2 Comments

Alferd Nobel Over a year ago

@ Daniel Roseman - Thanks , you got it , I'm was trying to do it the java way. This looks lot simpler, So I'm trying the understand the code snippet a little bit, the "body = {}" creates a List or string ? and the data should be passed in the POST request ?

Daniel Roseman Over a year ago

No, {} is a dictionary (ie a HashMap) - and yes, data is the stringified JSON which you can pass in the POST body.

fiveclubs · Accepted Answer · 2014-09-19 14:48:27Z

1

Try looking at json.dumps (converting a python dictionary structure to a json string) and json.loads (the reverse of dumps)

https://docs.python.org/2/library/json.html

answered Sep 19, 2014 at 14:48

fiveclubs

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IAlwaysBeCoding · Accepted Answer · 2014-09-19 15:14:51Z

1

Python is an adult-consenting language, you don't need setters/getters.

I would use a python dict or an OrderedDict if you want your json to be in the same order, since python dicts doesn't keep keys in the same order they were inserted.

answered Sep 19, 2014 at 15:14

IAlwaysBeCoding

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