code: def bulkSave(self, docs, onDuplicate="error", **params) :
          
  
          payload = []
          for d in docs :
              if type(d) is dict :
                  payload.append(json.dumps(d, default=str))
              else :
                  try:
                      payload.append(d.toJson())
                  except Exception as e:
                      payload.append(json.dumps(d.getStore(), default=str))
  
          payload = '\n'.join(payload)
  
          params["type"] = "documents"
          params["onDuplicate"] = onDuplicate
          params["collection"] = self.name
          URL = "%s/import" % self.database.URL
  
          r = self.connection.session.post(URL, params = params, data = payload)
          data = r.json()
          if (r.status_code == 201) and "error" not in data :
              return True
          else :
              if data["errors"] > 0 :
                  raise UpdateError("%d documents could not be created" % data["errors"], data)
  
          return data["updated"] + data["created"]
docs: Parameter docs must be either an iterrable of documents or dictionnaries.
          This function will return the number of documents, created and updated, and will raise an UpdateError exception if there's at least one error.
          params are any parameters from arango's documentation