属性错误：类型对象“宝马”没有属性“类型”

Question

class car:
        def __init__(self,model,year):
            self.model = model
            self.year = year


class BMW(car):
    def __init__(self,type,model,year):
        car.__init__(self,model,year)
        self.type = type

class Audi(car):
    def __init__(self,type1,model,year):
        car.__init__(self, model, year)
        self.type1 = type1

d500 = BMW('manual','500d',2020)
print(BMW.type)
print(BMW.model)
print(BMW.year)

Answer 1

You haven't really asked a question here, but presumably you're wondering why the error AttributeError: type object 'BMW' has no attribute 'type' is being thrown.

You're instantiating an instance of BMW with: d500 = BMW('manual','500d',2020) . However, in subsequent lines, you're referring to the class itself rather than the object that you've instantiated.

Since model , year and type are set in the constructor for car / BMW , BMW.type is not defined.

You need to call:

print(d500.type)
print(d500.model)
print(d500.year)

instead in order to refer to your newly created object.

Answer 2

You're trying to print the type from BMW , but you just set that object to the variable d500 . Use d500 instead to access the attributes.

d500 = BMW('manual','500d',2020)
print(d500.type)
print(d500.model)
print(d500.year)