tags.py 文件源码

def parse_compare(self):
        token = self.stream.current
        if token.type == 'name':
            if token.value in ('true', 'false', 'True', 'False'):
                node = nodes.Const(token.value in ('true', 'True'),
                                   lineno=token.lineno)
            elif token.value in ('none', 'None'):
                node = nodes.Const(None, lineno=token.lineno)
            else:
                node = nodes.Name(token.value, 'load', lineno=token.lineno)
            next(self.stream)
        elif token.type == 'lparen':
            next(self.stream)
            node = self.parse_expression()
            self.stream.expect('rparen')
        else:
            self.fail("unexpected token '%s'" % (token,), token.lineno)
        return node