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Title: Design and Guidance: OOP in Python (Overview) (Video) – Real Python

Open Graph Title: Design and Guidance: OOP in Python (Overview) – Real Python

Description: Welcome to Object-Oriented Coding in Python: Design and Guidance. My name is Christopher, and I will be your guide. This is the third part of a multi-part course. Parts one and two are about the how of object-oriented coding, covering the syntax of…

Open Graph Description: Welcome to Object-Oriented Coding in Python: Design and Guidance. My name is Christopher, and I will be your guide. This is the third part of a multi-part course. Parts one and two are about the how of object-oriented coding, covering the syntax of…

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Design and Guidance: Object-Oriented Programming in Pythonhttps://realpython.com/courses/solid-principles-python/
Christopher Trudeauhttps://realpython.com/courses/solid-principles-python/#team
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Discussionhttps://realpython.com/courses/solid-principles-python/continue/#discussion
Part onehttps://realpython.com/courses/python-class-object/
Part twohttps://realpython.com/courses/python-class-inheritance/
Sample Code (.zip)https://realpython.com/courses/solid-principles-python/downloads/solid-principles-python-code/
Course Slides (.pdf)https://realpython.com/courses/solid-principles-python/downloads/solid-principles-python-slides/
00:00https://realpython.com/courses/solid-principles-python/continue/#t=0.53
Welcome to Object-Oriented Coding in Python: Design and Guidance.https://realpython.com/courses/solid-principles-python/continue/#t=0.53
My name is Christopher, and I will be your guide.https://realpython.com/courses/solid-principles-python/continue/#t=4.75
00:08https://realpython.com/courses/solid-principles-python/continue/#t=8.73
This is the third part of a multi-part course.https://realpython.com/courses/solid-principles-python/continue/#t=8.73
Parts one and two are about the how of object-oriented coding, covering thehttps://realpython.com/courses/solid-principles-python/continue/#t=11.99
syntax of classes in Python and how to use its attributes and methods.https://realpython.com/courses/solid-principles-python/continue/#t=16.54
00:21https://realpython.com/courses/solid-principles-python/continue/#t=21.68
As everything in Python is an object, that includes intricate details,https://realpython.com/courses/solid-principles-python/continue/#t=21.68
such as how operations like adding and multiplying apply to your objects throughhttps://realpython.com/courses/solid-principles-python/continue/#t=25.57
dunder methods. This third part of the course is a little different.https://realpython.com/courses/solid-principles-python/continue/#t=30.14
00:34https://realpython.com/courses/solid-principles-python/continue/#t=34.83
It’s a bit more about the why and approach.https://realpython.com/courses/solid-principles-python/continue/#t=34.83
The focus in this part of the course is about how to build betterhttps://realpython.com/courses/solid-principles-python/continue/#t=37.98
object-oriented software and, in some cases, why you maybe shouldn’t use OOhttps://realpython.com/courses/solid-principles-python/continue/#t=41.44
techniques at all.https://realpython.com/courses/solid-principles-python/continue/#t=46.37
00:49https://realpython.com/courses/solid-principles-python/continue/#t=49.18
This third part of a three-part course teaches you about how thehttps://realpython.com/courses/solid-principles-python/continue/#t=49.18
Python object-oriented approach compares to other languages, when nothttps://realpython.com/courses/solid-principles-python/continue/#t=53.95
to use classes in Python, alternatives to inheritance, andhttps://realpython.com/courses/solid-principles-python/continue/#t=58.79
the SOLID principles.https://realpython.com/courses/solid-principles-python/continue/#t=64.01
01:07https://realpython.com/courses/solid-principles-python/continue/#t=67.37
The code in this course was written with Python 3.11. Object-oriented codinghttps://realpython.com/courses/solid-principles-python/continue/#t=67.37
in Python has gone through some changes over the years,https://realpython.com/courses/solid-principles-python/continue/#t=71.93
and so the code presented here won’t work in Python 2 without being altered.https://realpython.com/courses/solid-principles-python/continue/#t=74.17
01:20https://realpython.com/courses/solid-principles-python/continue/#t=80.4
Python’s a bit of a weird beast language-wise.https://realpython.com/courses/solid-principles-python/continue/#t=80.4
Its history is firmly in the procedural style scripting world,https://realpython.com/courses/solid-principles-python/continue/#t=83.58
but it has flavors of functional programming and object-oriented coding insidehttps://realpython.com/courses/solid-principles-python/continue/#t=86.86
of it.https://realpython.com/courses/solid-principles-python/continue/#t=91.6
01:32https://realpython.com/courses/solid-principles-python/continue/#t=92.58
This means you can choose how much or how little you use object-orientedhttps://realpython.com/courses/solid-principles-python/continue/#t=92.58
techniques when you code. It actually is very object-oriented underneath,https://realpython.com/courses/solid-principles-python/continue/#t=96.67
but you don’t have to use that mental abstraction if you don’t want to.https://realpython.com/courses/solid-principles-python/continue/#t=101.61
01:46https://realpython.com/courses/solid-principles-python/continue/#t=106.28
If you’re coming from other languages,https://realpython.com/courses/solid-principles-python/continue/#t=106.28
especially those which are object-oriented first,https://realpython.com/courses/solid-principles-python/continue/#t=108.27
this leap can be a bit of an adjustment.https://realpython.com/courses/solid-principles-python/continue/#t=111.45
If you’re an experienced coder in one language,https://realpython.com/courses/solid-principles-python/continue/#t=113.96
your first tendency when writing code in a new language is to use the stylehttps://realpython.com/courses/solid-principles-python/continue/#t=116.22
you’re familiar with, even if it isn’t a good fit for your new language.https://realpython.com/courses/solid-principles-python/continue/#t=120.36
02:05https://realpython.com/courses/solid-principles-python/continue/#t=125.76
As a Python coder,https://realpython.com/courses/solid-principles-python/continue/#t=125.76
if you come across a lot of object-oriented code where you’re wondering why theyhttps://realpython.com/courses/solid-principles-python/continue/#t=127.16
didn’t just use a dictionary,https://realpython.com/courses/solid-principles-python/continue/#t=131.46
there’s a good chance the original writer was an ex-Java person or somethinghttps://realpython.com/courses/solid-principles-python/continue/#t=132.93
similar. Once you do decide to write some object-oriented code,https://realpython.com/courses/solid-principles-python/continue/#t=137.9
whether in Python or any other language,https://realpython.com/courses/solid-principles-python/continue/#t=142.33
there are some guiding principles that should be followed.https://realpython.com/courses/solid-principles-python/continue/#t=144.9
02:28https://realpython.com/courses/solid-principles-python/continue/#t=148.16
This course is primarily about those principles.https://realpython.com/courses/solid-principles-python/continue/#t=148.16
You want to write clean code that can be supported by others.https://realpython.com/courses/solid-principles-python/continue/#t=151.31
Structure your code for reuse following the DRY—https://realpython.com/courses/solid-principles-python/continue/#t=156.57
that’s don’t repeat yourself—principle,https://realpython.com/courses/solid-principles-python/continue/#t=159.63
and you also want to take advantage of duck typing or, more formally,https://realpython.com/courses/solid-principles-python/continue/#t=162.27
polymorphism, where the interface to the object determines how it is used,https://realpython.com/courses/solid-principles-python/continue/#t=166.01
and it can be passed around to other code,https://realpython.com/courses/solid-principles-python/continue/#t=170.59
which doesn’t have to be concerned with its underlying implementation.https://realpython.com/courses/solid-principles-python/continue/#t=172.73
02:57https://realpython.com/courses/solid-principles-python/continue/#t=177.49
And once you start building classes on top of each other,https://realpython.com/courses/solid-principles-python/continue/#t=177.49
you want to do so in a fashion where you aren’t designing yourself into ahttps://realpython.com/courses/solid-principles-python/continue/#t=180.02
corner, keeping your code flexible for future changes.https://realpython.com/courses/solid-principles-python/continue/#t=183.56
03:07https://realpython.com/courses/solid-principles-python/continue/#t=187.88
There’s an acronym out there that can help you think about these ideas.https://realpython.com/courses/solid-principles-python/continue/#t=187.88
It’s named SOLID, the expansion of which is confusing, and a paragraph full,https://realpython.com/courses/solid-principles-python/continue/#t=192.0
so I won’t call it anything but SOLID until you get to that part of the course.https://realpython.com/courses/solid-principles-python/continue/#t=196.75
03:23https://realpython.com/courses/solid-principles-python/continue/#t=203.04
Before spending some time on SOLID,https://realpython.com/courses/solid-principles-python/continue/#t=203.04
let’s talk about whether you should orient your objects at all.https://realpython.com/courses/solid-principles-python/continue/#t=205.39
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Design and Guidance: OOP in Python (Overview) 03:30 https://realpython.com/videos/solid-principles-python-overview/
The Decision to Use Classes 10:27 https://realpython.com/videos/when-to-use-classes-python/
Single Responsibility 03:31 https://realpython.com/lessons/single-responsibility-principle/
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Interface Segregation 03:28 https://realpython.com/lessons/interface-segregation/
Dependency Inversion 03:31 https://realpython.com/lessons/dependency-inversion/
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