__init__.py 文件源码

def get_op(cls, op):
        ops = {
            symbol.test: cls.test,
            symbol.and_test: cls.and_test,
            symbol.atom: cls.atom,
            symbol.comparison: cls.comparison,
            'not in': lambda x, y: x not in y,
            'in': lambda x, y: x in y,
            '==': operator.eq,
            '!=': operator.ne,
            '<':  operator.lt,
            '>':  operator.gt,
            '<=': operator.le,
            '>=': operator.ge,
        }
        if hasattr(symbol, 'or_test'):
            ops[symbol.or_test] = cls.test
        return ops[op]