code: def serialize_list(out, lst, delimiter=u'', max_length=20):
  
      
  
      have_multiline_items = any(map(is_multiline, lst))
      result_will_be_too_long = sum(map(len, lst)) > max_length
  
      if have_multiline_items or result_will_be_too_long:
          padding = len(out)
          add_padding = padding_adder(padding)
  
          # we need to add padding to all lines
          # except the first one
          head, rest = cut_head(lst)
          rest = map(add_padding, rest)
  
          # add padding to the head, but not for it's first line
          head = add_padding(head, ignore_first_line=True)
  
          # now join lines back
          lst = chain((head,), rest)
          delimiter += u'\n'
      else:
          delimiter += u' '
  
      return out + delimiter.join(lst)
docs: This method is used to serialize list of text
      pieces like ["some=u'Another'", "blah=124"]
  
      Depending on how many lines are in these items,
      they are concatenated in row or as a column.
  
      Concatenation result is appended to the `out` argument.