Define a function to update a class integer property-CodePudding

I'm having issues defining a function that controls the correct "speed" (accelerate/slow down).

I currently have my code like this:

class Train():

    serial_nummer = 2021001

    def __init__(self, type, buildyear):
        self.type = type
        self.buildyear = buildyear
        self.serial_nummer = Train.serial_nummer
        self.speed = ()
        Train.serial_nummer  = 1
        return

    def snelheid(self, speed):
        pass

    def __str__(self):
        return (f"Train type: {self.type} \nBuildyear: {self.buildyear} \nSerial number: {self.serial_nummer} \nCurrent speed: {self.speed}\n\n")

train1 = Train('Alfatrain', '2001')
train1.speed = 100
print (train1)

How can I create a function that controls the correct "speed"?

Now I'm just modifying the speed with train.speed = 100.

CodePudding user response：

You don't really need a function when you can use train.speed = amount. You will want to initialize the speed as 0, not an empty tuple, though

Without more clarity, I'm guessing instructions are looking for

def accelerate(self, amount):
    self.speed  = amount 

def decelerate(self, amount):
    self.accelerate(-1*amount)