def update_pagenumber(self):
pages = record_get_field_instances(self.record, '<STR_LIT>')<EOL>for field in pages:<EOL><INDENT>for idx, (key, value) in enumerate(field[<NUM_LIT:0>]):<EOL><INDENT>if key == '<STR_LIT:a>':<EOL><INDENT>field[<NUM_LIT:0>][idx] = ('<STR_LIT:a>', "<STR_LIT>".format(value))<EOL><DEDENT><DEDENT><DEDENT>
300 page number.