@classmethod<EOL><INDENT>def nullval(cls):<DEDENT>
d = dict(cls.__dict__.items())<EOL>for k in d:<EOL><INDENT>d[k] = <NUM_LIT:0><EOL><DEDENT>d['<STR_LIT>'] = cls.sl<EOL>d[cls.level] = <NUM_LIT:0><EOL>return cls(**d)<EOL>
Create a new instance where all of the values are 0