'Copies the contents of another AbstractString object to itself
:param object:
Another instance of the same class
:param copy_func:
An reference of copy.copy() or copy.deepcopy() to use when copying
lists, dicts and objects'

def _copy(self, other, copy_func):

    super(AbstractString, self)._copy(other, copy_func)
    self._unicode = other._unicode
