code: def do_format(self, event_iterable):
          
  
          for operation in self.formatter_chain:
  
              # Make sure the operation has access to certain basic objects like colored
              partial_op = functools.partial(operation, colored=self.colored)
              event_iterable = imap(partial_op, event_iterable)
  
          return event_iterable
docs: Formats the given CloudWatch Logs Event dictionary as necessary and returns an iterable that will
          return the formatted string. This can be used to parse and format the events based on context
          ie. In Lambda Function logs, a formatter may wish to color the "ERROR" keywords red,
          or highlight a filter keyword separately etc.
  
          This method takes an iterable as input and returns an iterable. It does not immediately format the event.
          Instead, it sets up the formatter chain appropriately and returns the iterable. Actual formatting happens
          only when the iterable is used by the caller.
  
          Parameters
          ----------
          event_iterable : iterable of samcli.lib.logs.event.LogEvent
              Iterable that returns an object containing information about each log event.
  
          Returns
          -------
          iterable of string
              Iterable that returns a formatted event as a string.