Python Quick Tip: The Difference Between "==" and "is" (Equality vs Identity)

[@pepehimovic3135]

⚽ = "football" 🏈 = "football" ⚽ == 🏈 >>> True ⚽ is 🏈 >>> False

[@ghostriley22]

football != handegg

[@coreyms]

Haha. That’s great

[@vaguebrownfox]

neat

[@ViratKohli-jj3wj]

Thats great way of explanation, I appreciate it

[@angjohnsyin9517]

Thanks zlatan

[@Remls]

'coke' == 'pepsi' *_BLASPHEMY!_*

[@shreyashkashyap]

Extremely well explained! It was a bit confusing in the pepsi example but the programming example made it all clear.

[@Xartab]

I had no idea lists would behave like that, that's really important to keep in mind when assigning variables!

[@scarletdcruz7843]

Are you writing a book? Cause I'd buy it.

[@rsrazorfen]

Hi Corey, I've been watching many of your videos (especially the flask-tutorial) and just wanted to thank you. Those videos basically got me started with python and helped me not only for my personal coding but also for my job. You're doing an amazing work - keep it up man, much love from Germany!

[@umaraftab6073]

I just watched your video on Unit Testing and wished to have you upload the next one. And, then here it is. :)

[@Gaspar.Albertengo]

Excellent. Would be nice to see how "is" interacts with "not", "in", ect.

[@nythepegasus]

I know this is a very old comment, but you cannot use is with in, it throws a SyntaxError. “is not” gives a SyntaxWarning asking if you meant “!=“

[@lukebircharchive3833]

@@nythepegasus The syntax warning is because you probably should've used "!=" or not "==" in that case instead of "is not". If you type in "2 is 3", it would probably show you the same warning.

[@TexasGunDude]

You just got a new Patreon supporter.

[@coreyms]

Thanks!!

[@PandhuW]

I like your explanation. I also like your pandas tutorial video. Btw, I saw this in a book a = [1, 2, 3] c = list(a) a == c >>> True a is c >>> False

[@leondaz]

I love you man, really thanks, I came to the newest video you posted just to thank you for everything, I hope you see this

[@karimkohel3240]

this is the best type of content please keep educating us like that

[@Ghasakable]

Man we missed you so much!!, I

[@scotttct]

I am taking a course on Python and this was very helpful to see how and why the == and is comparisons are used in code. Thanks!

[@zakariyaabubakar6298]

Thanks Corey. Your a gifted teacher

[@UrstrulyPrathap]

Thank you so much sir..... finally I got Python developer job ❤️ ..only because of your tutorials❤️

[@nicoTheGreatswordUser]

How did u start in python

[@coreyms]

Congrats!

[@poke_champ]

Corey Schafer uploads *[EVERYBODY LIKE THAT]*

[@SeaTaj]

Thank you. Great content as usual. Is it weird that I'm binging your content?

[@ulfgj]

@3:46 - now how did u space out that list so nicely? shortcut?

[@nehat786]

thank god you came back

[@aashayamballi]

Thanks Corey 😊

[@rainbowskeppy5292]

3:55 you could just write print(l1 == l2)

[@rodwanbakkar2512]

I like your videos before watching them

[@glorytoarstotzka330]

4:15 question : could you also do "print(l1 == l2)" instead of "if l1 == l2: print(True) else: print(False)" ? . Edit: I see that at the end of the video you've done this , so my question has been answered

[@coreyms]

Yes. I just did it with the conditional at first so that it was more clear what was going on.

[@davidm.johnston8994]

Thank you for this video Corey!

[@cati4142]

I really love your work! Thank you so much for your videos! Will you publish something about statistics with python? hypothese testing, linear regression or something? Would be sooo great

[@lethanhtu125]

Your video really easy to understand

[@leondaz]

I understand them perfectly because I made a project using them, but I still like if corey explains them, cause 100% I'll learn something new

[@LuisSanchezLouieLouie]

Great example man. thanks

[@changanzhang3124]

Corey you're awesome! How do you actually learn all these....and explain them in such a simple manner...and make these videos open source. Thanks!

[@nathantum8463]

I think he should make a video on how he learns all the new stuff.

[@khalidhassani6173]

KZbin has got a talent is Schafer

[@NomadLovesUs]

Clear and concise, thank you!

[@fredwooten14]

Thanks Corey, Great video!

[@rounakghosh6213]

Awesome, thanks for the clear explanation..

[@davidcarter8932]

Your videos are exceptional. I enjoy them all. In this one it would help to expand a little on when to use "is" or ==. Linter seems to want me to use "is" in logical comparisons, but doesn't complain about == in other comparisons. So, should we use "value is True" and "x == y"? "Value is True" seems to work, but I don't trust it based upon your description about having identical memory locations. Are True and False assigned fixed memory locations and logical variables assigned one of those two memory locations? Since I don't know the answer, I am inclined to always use == which may not be pretty, but it works. What do you think?

[@ulfgj]

corey, whats the color theme for sublime you are using here? it's so smoooth.

[@coreyms]

Predawn

[@rajath1964]

@@coreyms how to comment multiple lines at once using '#' (single line comment), i see many youtubers do that but just cant figure it out. like what i mean is : use # to comment multiple selected /highlighted lines with single click

[@EnglishRain]

You are so fantastic i live you and miss you thank you so much for your amazing content!!

[@jinyang4796]

== checks for equality is checks for identity (i.e. are the objects from the same memory address?) Values can be considered equal without being the same object in memory.

[@oltlatifi4870]

Thank you for what you're doing

[@souvikghosh6966]

If the names to the two persons are the same, then we call they are '==' to each other. If they look like exactly the same like twins then we call they are identical, which means they are 'is' to other. Nice!!!

[@khireddinebelkhiri725]

do you know bro u are great thank you from algeria

[@thinktech2936]

Very well explained

[@blueexorcist4300]

what happens if you use the is on two primitives?

[@ericdrumond_ancap]

Hey man, I am from Brazil and I like a lot your videos. Do you have plans to make a Kivy Tutorials??? Thank you for the amazing videos.

[@coreycarter5668]

Even though I already understood this concept.....just going to watch the video because well-he’s amazing!

[@adityaprasaddhal2462]

Thanks for knowledge

[@aikimark1955]

I wish you had included a "Type() is" example as well as the .copy() method for your second list

[@krishnachaitanya1078]

Thank you corey

[@balzerno1]

Its funny how i was looking at the exact same thing just before clicking on this video haha

[@legend7890]

really good explanation

[@linuxrant]

wonderful video!

[@robot341]

This is Important topic, Good !!

[@Yashparwal1]

thanks for the explanation

[@MJFAN666]

That's weird.. So what if I say l2=l1 and modify l2? Will it also change l1?? What if I wanted to make a copy of the var without messing with mem location?

[@yoyolubi]

Let me se if i got it right... so basicaly when you use l2 = l1 in Python is the same thing as you use int* l2 = l1 to point to the l1 array in C, both lists (or arrays) end up refering to the same memory address? But when i use l1, l2 = 100, 100 print(l1 is l2) It returns true, so why? I mean... i didnt use l1 = l2 although they have the same value... Is it because both are the same instance of the integer class in Python, and by that refers to the same object when l1 and l2 variables recives their values?

[@franciscorossi5633]

Could anybody tell me which program or text editor is he using to run Python in this video? Thanks

[@Miyota_9015]

Thanks bro, any chance of you recording a series on Flutter in the future? that would be amazing!

[@mohsam3868]

d=[0.25,0.10,0.50] def coin(num): for i in d: if num%i == 0: print(i) coin(1.25) coin(2.2) '''why the reminder in this case is not equal zero '''

[@daniloreboucas5888]

2.2 % 0.1 returns a number very close to 0 instead idk why but on my console it is returning 5.5e-17 instead

[@daniloreboucas5888]

I think when performing this division python uses very close approximation of the numbers instead of the actual values

[@Bread-vk8fl]

How to comment everything like he did at 5:59?

[@haroldaaron2098]

Great videos about python, please make a video about comparison of Pass by value,reference and Pass by object reference in python, Hope to see more videos also in advance python

[@arar4454]

Can you make some videos to : How i make exponential fits and gaussian fits

[@mauricioyaman570]

excelent explanation

[@scifregizmoguy]

# An `is` expression: A is B # Will evaluate to a boolean. # An equivalent expression: id(A) == id(B)

[@AjayJain-ef2mz]

what about id(A) is id(B)?

[@hamidsk2573]

dear Corey can you made python tutorial for the advance programming feature in python like multitasking , multithreading and async task

[@AbdurRahman-iy7nd]

Thanks for your definition. I got the point. But the example with pepsi is not so relevant.

[@tinman222]

Hey Corey , i am using ckeditor in a django blog app hosted on digital ocean , and using digital ocean spaces for serving static files which uses amazon s3, but when it is not working properly can u plz make a video on it, i am debugging for atleast 10 days ckeditor uploader not working and even when it says paste the url it also not working, plz plz plz help me plz its very important and urgent bcoz my app is already on server

[@benx5781]

🏀=ball 🎾=ball 🏀=🎾 if 🏀==🎾: print("🏀==🎾") if 🏀 is 🎾: print("🏀 is 🎾") Here output will be: 🏀==🎾 🏀 is 🎾

[@ihalil95]

Amazing video as always. My question is x = 2 y = 2 if x is y: print(True) x and y are different. but their id(x) and id(y) are the same. Why? Also when make y = 2.0 float its id changes.

[@coreyms]

That’s because some common values are immediately stored in memory when Python is first run for efficiency reasons. So sometimes you get behavior like this. But I wouldn’t rely on using “is” in that way in your programs because it won’t always be true.

[@CT7ALW]

Check my answer to Avinash Pandey ( &lc=UgwEAvkuTKLuEe27Kfh4AaABAg.8yIgY8IB_8f8yIrgMw5R6u )

[@gfddgitgud3848]

Thank you Thank you Thank you !!!

[@delapuenteignacio]

One thing that might be worth adding is that if I define two integers rather than lists, then they both get stored in the same memory location. i.e. x = 3 y = 3 "x is y" outputsTrue. This won't happen with strings unless its just one word. So if x = 'a string' y = 'a string' "x is y" outputs False but if x = 'justoneword' y = 'justoneword' "x is y" outputs True. Go figure...

[@rajath1964]

same holds good for string also, name = "tony" name1 = "tony" print(id(name)) print(id(name1)) if name is name1: print(True) else: print(False) ********************************* the above code returns same memory reference and True. i think he was specifically describing for lists

[@aggieaggie3946]

hey Corey, thanks so much for the tutorials, they are really good but would you do a tutorial on how to all some one comment on your posts in your blog?thank you, i will really appreciate

[@tinman222]

Or can u make a video on how to implent a good wsywig editor which has file uploading and accesing functionality in in django app on front and also on admin panel , in text area

[@pushpajitbiswas3752]

Good explanation, can you make a video over pandas, numpy, opencv any one of these?

[@TeguhGunawan]

Thanks 👍

[@geoClexE]

thank you so much !!!

[@vkrs3315]

Thank you so much

[@ember9361]

it did! thank you :)

[@tyt00341]

Thanks u teach well may I check which python IDLE are u using thanks

[@lelgenio]

I think he uses Sublime text Also, IDLE is the name of the simple python IDE I would recommend you trying Thonny if you are just starting

[@geeseguy2715]

List = [1 , 2] "Okay" List[1] = 1 "Okay" List[2] = 1 "Okay" List [1] == List[2] --> True "Makes sense" List[1] is List[2] --> True ?????????????????

[@G_a_n_d_u]

Corey Schafer ! = others programmer❤️

[@0Navin0]

Thank you.

[@GK-lf1ll]

Why do we have two variable names for same memory location? Where can we apply in programming?

[@s1n7ax]

If you have a object list, and you want to remove a given object from the list, you can use 'is' i guess. Not a python programmer but most of the languages are using 'is' concept by default so this is one use case.

[@ginopornasdoro9183]

do you have laravel tutorial?

[@samytamim2603]

can we use is keyword with Primitive Values ?

[@andrewluo6088]

you are the best teacher

[@RichellyItalo]

Please, what's your font family?

[@coreyms]

Source Code Pro

[@RichellyItalo]

@@coreyms thanks. One more thing. And the color scheme?

[@coreyms]

Richelly Italo Predawn. I have a video on how I set up my Sublime Text if you want to see the full setup.

[@RichellyItalo]

@@coreyms Thanks man!!! I'm watching now.

[@needsomehike]

what text editor are you using in these videos? (does anybody know?)

[@andreamagista6742]

Sublime text

[@needsomehike]

@@andreamagista6742 thank you!!

[@maievmaiev8327]

how can i copy l1 in another list named l2, and when changing l2 it wont affect l1, cause by copiying with =, the changes done on l1 will accure on l2

[@coreyms]

Hey there. Great question. Instead of giving all the different options in a long comment, I think this StackOverflow answer does a great job of explaining your different options: stackoverflow.com/questions/2612802/how-to-clone-or-copy-a-list

[@dmitryvlasov931]

l2=l1.copy()

[@maievmaiev8327]

@@coreyms thank u

[@maievmaiev8327]

thank u!

[@muhtadilaskar7650]

You are awesome

[@fantasticghosts7366]

Nice.

[@rubemjr9623]

So is the is keyword equivalent to comparing C pointers?

[@umaraftab6073]

Hey Corey, can you please make a short video explaining '_' and '__' used in variable declaration in Python? Thanks

[@FixDaily]

That has to do with Private ( _ _ ) or Protect ( _ ) properties on Classes.

[@ameerikbal8160]

s = "india" b = "india" print(s is b) this code gives me a True value

[@coreyms]

Sometimes smaller strings can share objects in memory. But you won't get the same behavior where changing one variable affects the other like a list because strings are immutable. With longer strings you shouldn't see that behavior.

[@ricardoseung1785]

Is the command "is" the same as command "="? thank you!

[@tiagu8085]

No. '=' is assignment

[@ldizai]

Hi Corey, thanks for all teh vids! Could you do one on how to check if the person is a subscription member or not in Python-Flask. I've learned everything in your Flask Blog app. So after that is done, how to set up members account for premium features via payment.

[@desmondade]

You can basically have a field in your user model name is_subscriber which is a bolean and set this value to true when a user subscribes in the payments route or you have a OneToOneField to add this extra info

[@ldizai]

Straight Emirati thanks!! I’ll test it out

[@desmondade]

@@ldizai yeah just try it out any problem I will be glad to help

[@j0584924]

It should be noted that "is" works a bit differently for mutable and immutable types...

[@elgalvin]

Advise you to use Ctrl+D to duplicate the code on the next string

[@sainco3036]

thanks.

[@RameenFallschirmjager]

great explanation. 'banana' is 'cucumber', because both of them are slender and they are fruit! have I got the gist of this video right?!

[@tulsivanol]

Hello sir, Can u make a tutorial on numpy and pandas?

[@leemoore8154]

This doesn't seem to work with integer values. a = 5 b = 10 - 5 print(a is b) ----- True If you change it to b = 10/2 to get a float, then it prints False, but if they're both integers with the same value, they seem to be stored in the same place in memory.