Exercising Your New Knowledge

An example solution would be really useful here!

@CB Agreed! Please find an entire collection of exercises accompanying this video course, along with their solutions and detailed discussions, in a separate course: Python Basics Exercises: Object-Oriented Programming. If you have specific questions, then don’t hesitate to ask them in the comments or hop on the Real Python Slack.

Hi! Can you please post the solutions to these in the discussions? It is not helpful to be digging through the extra videos while trying to practice these!

@Natasha Kaplan you can get all the solution code by navigating to the exercises course that Bartosz linked above.

You don’t need to watch the course, you can download the code by scrolling to Downloadable Resources in the course overview page, then click on Sample Code (.zip).

It’s a lot of files and a lot of lines of code, so downloading the code from there will probably be easier than copying it from a comment here.

The last couple of note you shared, were spot on, once you follow a lecture, and you go on to the next section, and keep following what the instructor is doing, without practicing anything and coming up with your own solution to your own projects, etc., by the end once you are face to face with a blank script, reality hits you in the face, because it’s almost like you forgot everything that you just learned, and it seems that the concepts you learned are slowly fading away, because you didn’t put extra work reiterating through the concepts, and practicing it enough.

Sometimes we lie to ourselves that we actually understood it, because you were copy and pasting what the instructor was saying, but truly, to understand something, you have to be able to explain concepts in your own words, and be able to apply what you learn to your own projects, when to use classes, vs when not to use it, following a tutorial is not the same as working on your own projects, because there is more involved than writing code, as every beginner will soon find out, take away points are, practice enough, and most of all, create projects that you are passionate about, along the way solving problem using the divide and conquer method, most importantly do no wait until you went through enough tutorials to start your own projects.

A little advice to someone reading this is to download the free tool draw.io, and sketch your ideas through diagrams, before you start on any projects, that way you reduce your workload by some %, setting aside the thinking and focusing on coding, just wanted to share my point of view on this topic that some beginners are ignoring.

Thanks for sharing your thoughts @Braele, totally agree :)

My solution (please comment if the solution is not complete, thank you):

class Doggo:
    species = "Canis familiaris"
    def __init__(self, name, age, coat_color):
        self.name = name   
        self.age = age    
        self.coat_color = coat_color

class Car:
    brand = "X"
    def __init__(self, name, year, color, mileage):
        self.name = name   
        self.year = year    
        self.color = color 
        self.mileage = mileage 

    def __add__(self, other):
        self.mileage = self.mileage + other.mileage

    def drive(self, other):
        return f"New mileage: {self.mileage}"

    def __str__(self):
        return f"Car: {self.name}, {self.year}, {self.color}, {self.mileage}"

Here is my little code.

Car:
    def __init__(self, mileage):
        self.mileage = int(mileage)


    def description(self):
        return f"The car has driven {self.mileage} miles"


    def drive(self, num):
        self.num = int(num)
        return f"The new miles for the car is {self.num + self.mileage} miles"

Since the question is to update attribute value using a method i tried following but its not working. Not sure what is the issue here.

class Car: def __init__(self,mileage): self.mileage=mileage def drive(self,distance): self.milege=self.mileage+distance

ford=Car(5) print(ford.mileage) ==> giving 5 as expected.

ford.drive(20) print(ford.mileage) ==> Giving 5 but i was expecting 25 here. What am i doing wrong?

found the mistake, has spelling wrong of self.milege in drive method. Sorry.