Python 3 Programming Tutorial - Classes

Welcome to another Python 3 basics tutorial. This tutorial is going to be covering the basics of classes in python. For the most part, I just want you to just understand how to read and understand a class' workings. You can think of classes as groupings of functions, usually. Classes quickly work their way into "intermediate" programming, so hopefully I can just help you understand how they work and how to follow code that uses them.

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[djleisheng]

Guys, make sure to Capitalize your class names; it is the standard in most object-oriented programming languages and it makes it a lot more clear in your code to distinguish them from your regular variables.

[darleyt]

You are the man, I now get paid for coding thanks to you.

[sergio]

When you have been trying to understand classes forever with other Youtube channels, you get here and in one minute you are all set.

[EpochIsEpic]

It's like a folder for variables and functions. This makes a hell of a lot more sense now, thanks!

[Mehdikun]

Clear, Simple and easy: that's what i call a Tuto
Thanks, hopes there is a advanced version coming for this.

[xmaxfuture]

i have watched 10K + videos trying to find a sample explenation.. FINALLY FOUND IT

[bull-or-bearfinance]

** for those using python 2.7
class Calculator:


def addition(self, x, y):
added = x + y
print(added)

def subtraction(self, x, y):
sub = x - y
print(sub)

def multiplication(self, x, y):
mult = x * y
print(mult)

def division(self, x, y):
div = x / y
print(div)

Calc = Calculator()
Calc.multiplication(3, 5)

[shimmeringreflection]

Extremely easy to understand easy for me as a noob. I like how the examples you use are self explanatory, and you don’t make the mistake of overcoming like so many other YouTubers. Bravo, I just subscribed 😀

[richardbrown]

Awesome explanation. I've been having the hardest time reading docs and understanding how the syntax works when something is a class.

[EpochIsEpic]

This is the bucky's c++ tutorial of Python

[yahelck]

I think most Python developers miss the point of classes and OOP in general. Classes are like a blue print for creating objects with the same structure but different values, or basically to create your own custom data type. Modules are just a way to group methods together.
Using a class to create a calculator object kinda defeats the purpose of a class as you can't (and don't need to) create more than one instance of it.

An example of a class could be a Neural Network, which you can create multiple instances (models) of, that all share the same structure (layers, fit function, feed forward function, etc.).
I'm pretty sure you can't achieve the same goal with Python modules.

[alan]

this is absolutely by far the best explanation on this topic, thanks a lot!

[arturmuellerromanov]

Works all fine for me. Are you guys sure you use Python 3? I had Python 2.7 and Python 3 installed and IDLE was running in 2.7. To run IDLE in Python 3 rightclick on your python file and choose the second "Edit with IDLE". It will show you "Edit with IDLE 3.x" on the right side.

[AntiMuxi]

wont it give you a syntax error when using subtraction? you got an extra ", " there.

[melvinstinson]

GREAT!! I'm new at this...Very Informative.

[HaydarAli]

Class Place()
def __init__(self):


what does the def __init__(self) do and mean?
thanks

[lonebots]

In this part can you please explain about the 'self' keyword

[angelowattersr.]

Just tried my self but it works only once. see below. Why ?


>>> class calculator:
def addition (x, y):
sum = x+y
print (sum)


>>> def subtraction (x, y):
sub= x-y
print (sub)


>>> calculator.addition(3, 5)
8
>>> calculator. subtraction(5, 3)
Traceback (most recent call last):
File "<pyshell#27>", line 1, in <module>
calculator. subtraction(5, 3)
AttributeError: type object 'calculator' has no attribute 'subtraction'

[hasal]

Your videos are very good. You have a good amount of talent

[shimmeringreflection]

Can you do a tutorial on class init, self?