code: def append(self, key, _item):  # type: (Union[Key, str], Any) -> Table
          
          if not isinstance(_item, Item):
              _item = item(_item)
  
          self._value.append(key, _item)
  
          if isinstance(key, Key):
              key = key.key
  
          if key is not None:
              super(Table, self).__setitem__(key, _item)
  
          m = re.match("(?s)^[^ ]*([ ]+).*$", self._trivia.indent)
          if not m:
              return self
  
          indent = m.group(1)
  
          if not isinstance(_item, Whitespace):
              m = re.match("(?s)^([^ ]*)(.*)$", _item.trivia.indent)
              if not m:
                  _item.trivia.indent = indent
              else:
                  _item.trivia.indent = m.group(1) + indent + m.group(2)
  
          return self
docs: Appends a (key, item) to the table.