def __missing__(self, key):
value = getattr(self._instance, key)<EOL>if key == '<STR_LIT>':<EOL><INDENT>value = len(value)<EOL>return '<STR_LIT>'.format(value, '<STR_LIT>' if value == <NUM_LIT:1> else '<STR_LIT:s>')<EOL><DEDENT>return value<EOL>
Return dynamic value for 'payload' key.