Question

class Temperature:
    def __init__(self, temperature):
        """Gets temperature from user"""    
        self.__temperature = temperature

    def aboveFreezing(self):
        """Returns True if temperature above freezing point"""
        raise NotImplementedError("Method aboveFreezing not implemented")

    def convertToFahren(self):
        """Returns a new Temperature object converted to degrees Fahrenheit"""
        raise NotImplementedError("Method convertToFahren not implemented")

    def convertToCelsius(self):
        """Returns a new Temperature object converted to degrees Celsius"""
        raise NotImplementedError("Method convertToCelsius not implemented")

    def convertToKelvin(self):
        """Returns a new Temperature object converted to degrees Kelvin"""
        raise NotImplementedError("Method convertToKelvin not implemented")

class Kelvin(Temperature):

    def __init__(self, temperature):
        Temperature.__init__(self,temperature)

    def __str__(self):
        """Returns string of temperature"""
        return self.__temperature + 'degrees Kelvin.'

    def aboveFreezing(self):
        """Returns True if temperature above freezing point"""
        if self.__temperature > 273.15:
            return True
        else:
            return False 

    def convertToFahren(self):
        """Returns a copy Kevin to Fahren"""
        return ((self.__temperature * 9/5) - 459.67)

    def convertToCelsius(self):
        """Returns conversion from Kelvin to Celsius"""
        return self.__temperature - 273.15

    def convertToKelvin(self):
        """Returns copy of Kelvin"""
        return self.__temperature

我尝试运行开尔文课，所以我尝试：

t1 = Kelvin(33)
print(t1)

但它告诉我：

    return self.__temperature + 'degrees Kelvin.'
AttributeError: 'Kelvin' object has no attribute '_Kelvin__temperature'

我是班级的新手。我认为这是因为我的错误：

def __init__(self, temperature):
    Temperature.__init__(self,temperature)

因此，如果这是问题，我如何让开尔文类具有温度值？我必须让Kelvin成为温度的子类。如果我没有这样做，我知道我可以这样做：自我.__温度=温度

但是我如何将Temperature类的温度分配给Kelvin子类？

如何使这个类在Python上工作？

0 个答案: