'This is a mixin-safe version of Column.iter_str_vals.'

def iter_str_vals(self):

    col = self._parent
    if (self.parent_table is None):
        from ..table.column import FORMATTER as formatter
    else:
        formatter = self.parent_table.formatter
    _pformat_col_iter = formatter._pformat_col_iter
    for str_val in _pformat_col_iter(col, (-1), False, False, {}):
        (yield str_val)
