code: def get_default_calendar(self):
          
  
          url = self.build_url(self._endpoints.get('default_calendar'))
  
          response = self.con.get(url)
          if not response:
              return None
  
          data = response.json()
  
          # Everything received from cloud must be passed as self._cloud_data_key
          return self.calendar_constructor(parent=self,
                                           **{self._cloud_data_key: data})
docs: Returns the default calendar for the current user
  
          :rtype: Calendar