move JSON.stringify to python helper

Author: Fr0stM0urne

src/targets/python/helpers.js

@@ -77,7 +77,7 @@ module.exports = {
         if (value === null || value === undefined) {
           return ''
         }
-        return '"' + value.toString().replace(/"/g, '\\"') + '"'
+        return JSON.stringify(value)
     }
   }
 }

src/targets/python/requests.js

@@ -56,7 +56,7 @@ module.exports = function (source, options) {
   switch (source.postData.mimeType) {
     case 'application/json':
       if (source.postData.jsonObj) {
-        code.push('payload = %s', JSON.stringify(source.postData.jsonObj))
+        code.push('payload = %s', helpers.literalRepresentation(source.postData.jsonObj, opts))
         jsonPayload = true
         hasPayload = true
       }