code: def user_activity_stats_by_date(self, username, date, grouped=None):
          
          request_url = "{}/api/0/user/{}/activity/{}".format(self.instance, username, date)
  
          payload = {}
          if username is not None:
              payload['username'] = username
          if date is not None:
              payload['date'] = date
          if grouped is not None:
              payload['grouped'] = grouped
  
          return_value = self._call_api(request_url, params=payload)
  
          return return_value['activities']
docs: Retrieve activity information about a specific user on the specified date.
  
          Params:
              username (string): filters the username of the user whose activity you are interested in.
              date (string): filters by the date of interest, best provided in ISO format: YYYY-MM-DD
              grouped (boolean): filters whether or not to group the commits
  
          Returns:
              list: A list of activities done by a given user on some particular
                    date for all the projects for given Pagure instance.