Python AttributeError:type object'；汽车&x27；没有属性'；速度'；

我用对象Car调用Car类时收到错误消息

class Car:
def __init__(self, speed, unit):
    self.speed = speed
    self.unit = unit
def __new__(self, speed, unit):
    str = "Car with the maximum speed of {} {}".format(self.speed, self.unit)
    return str

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新建是创建实例的第一步它被称为first，负责返回类的新实例

相反，init不返回任何内容；它只负责在创建实例后初始化实例

class Car:
    # def __init__(self, speed, unit):
    #     self.speed = speed
    #     self.unit = unit
    def __new__(self, speed, unit):
        self.speed = speed
        self.unit = unit
        str = "Car with the maximum speed of {} {}".format(self.speed, self.unit)
        return str

a = Car(10, 2)
print(a)

一般来说，您不需要重写new，除非您正在对不可变类型（如str、int、unicode或tuple）进行子类化

另一种方式

class Car:
    def __init__(self, speed, unit):
        self.speed = speed
        self.unit = unit
    def __str__(self):
        str = "Car with the maximum speed of {} {}".format(self.speed, self.unit)
        return str

a = Car(10, 2)
print(a)

---

固定压痕，并使用方法

speed\u check（）

和单个构造函数：

class Car:
    def __init__(self, speed, unit):
        self.speed = speed
        self.unit = unit
    def speed_check(self):
        return "Car with the maximum speed of {} and the unit {}".format(self.speed, self.unit)
        
CarObj = Car(120, 10)
result = CarObj.speed_check()

print(result)

输出：

Car with the maximum speed of 120 and the unit 10   

---

您正在使用

\uuuuu new\uuuuu

，我不知道为什么。您可以改为使用此选项：

class Car:
    def __init__(self, speed, unit):
        self.speed = speed
        self.unit = unit
    def new(self):
        str = "Car with the maximum speed of {} {}".format(self.speed, self.unit)
        return str

---

我想通过调用object@VivekGautam我很高兴它有帮助，如果您的问题得到解决，请将其标记为答案！

Car with the maximum speed of 120 and the unit 10   

class Car:
    def __init__(self, speed, unit):
        self.speed = speed
        self.unit = unit
    def new(self):
        str = "Car with the maximum speed of {} {}".format(self.speed, self.unit)
        return str