Singleton Design Pattern - Advanced Python Tutorial #9

In this video we talk about the singleton design pattern in Python.

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[xzex]

A Singleton pattern in python is a design pattern that allows you to create just one instance of a class, throughout the lifetime of a program. Using a singleton pattern has many benefits. A few of them are: To limit concurrent access to a shared resource.

[brnwiqz]

Just what I needed, thank you so much!

[HerptieDerper]

I swear I learn more from you than from college

[WordsThroughTheSky]

great video, i'm actually learning a from the *design pattern* videos

[yonatanbeyn]

thank you floren. need more video on the rest of the common design pattern.

[DominatorIII]

I was missing the explanation, on why you would do this? What are the applications? And why always use person as an example, which doesn't say anything. Couldn't you have used a more applied example? Other than that, I love your videos! Please keep up the good work!

[FILALIHOUCEMEDDINE]

Can we make this pattern look more "pythonic" by overriding the __new__ static method instead of introducing get_instance?

[SparePlayss]

imagine being a complete python noob and watching this..

[xzex]

Python programmers almost never implement the Singleton Pattern as described in the Gang of Four book, whose Singleton class forbids normal instantiation and instead offers a class method that returns the singleton instance. Python is more elegant, and lets a class continue to support the normal syntax for instantiation while defining a custom __new__() method that returns the singleton instance. But an even more Pythonic approach, if your design forces you to offer global access to a singleton object, is to use The Global Object Pattern instead.

[mienislav]

3:09 Never use sth == None. pep8 does not recommend that. Instead, use sth is None.

[sayaknaiya]

Why do you need to create an interface for this singleton example??🤔🤔

[nirmaltheprogrammer]

Hi bro . Help me I can't understand about this pattern topic can you explain pls? And how many types are there?

[kdbwiz]

Why do we need, or do we need the IPerson class at all?

[pkzkkog]

implementation using decorator

def singleton(cls):
instances = {}
def getinstance():
if cls not in instances:
instances[cls] = cls()
return instances[cls]
return getinstance

@singleton
class MyClass:
...

[guy]

Why creating get_instance method if you don't use it ?

[gavin]

Can we inherit from this singleton class?

[tusharkuwar]

I think you should add thread lock. So it will make it thread safe

[SergioInToronto]

This is an overly-complex solution. Don't need any abstractions or classes. All you need is a global variable + 1 function.

Feels like you're writing Java in Python my dude.

[jrgomez]

Great explanation! I'm still trying to figure out where this pattern can be used. Anyway. Thanks!

[MrWadood]

Hey! A very clear explanation as usual. A suggestion, you could display your video on the bottom left, that way it won't block any text.