def get_sort_indicator(self, field):
indicator = '<STR_LIT>'<EOL>if field == self.sort_field:<EOL><INDENT>indicator = '<STR_LIT>'<EOL>if self.sort_order == '<STR_LIT:->':<EOL><INDENT>indicator = '<STR_LIT>'<EOL><DEDENT><DEDENT>return indicator<EOL>
Returns a sort class for the active sort only. That is, if field is not
sort_field, then nothing will be returned becaues the sort is not
active.