Python comes equipped with different objects

to help you organize your data. These data structures include lists, tuples, sets and

dictionaries. Today we talk about sets. Sets are useful when you are working with data

and the order or frequency of the values do not matter. Get ready to become an element

of the set of people who understand sets… We will begin by creating an empty set called

“example”. To see a list of methods you can use on a

set, use the directory function on our set. We want to add things to our set, and the

“add” function looks promising. To see how to use this method, use the help function. The help text provides a reminder of the definition

of a set. Duplicates are not stored. If you try to add the same element twice, the set

will store it the first time, and ignore it the second time. We will use this method to add several objects

to this set. The integer 42… The boolean value False… The number Pi as a float… The string “thorium”. Notice that you can add data of different

types to the same set. If you enter the name of the set and press

enter, Python will show you the items inside the set. Each item inside a set is called

an “element”. When you try this, the elements may appear

in a different order for you than what is displayed here. Do not panic. For sets, the

order does not matter. This is different from lists and tuples, where the order DOES matter. Now look what happens if you try to add the number 42 to the set a second time… The

set still contains just one copy of the number 42. Sets do not contain duplicate elements. To see the number of elements in a set, use

the length function, which is shortened to L-E-N… Our set does indeed have 4 elements. To remove an element from this set, use the

remove method. Before we test this method, let’s look at the help text. Python gives a stern warning. If you attempt

to remove an element that is not in the set, you will get an error. To test this method, let’s remove the number

‘42’. We can check that it worked either by looking

at the number of elements… Or displaying all the elements inside the

set… Look what happens if we try to remove ‘50’,

which is not in the set… We get an error, just as Python warned us. To avoid the possibility of an error, there

is a second way to remove an element: the discard method. Here is the help text: With the discard method, if you try to remove

an element which is not in the set, the method does nothing – it quietly returns without

making a change. Watch what happens when we discard the integer 50, which is not in the

set: Nothing… Peace and quiet… The choice is yours. If you want to be alerted

when your code tries to remove an element not in the set, use “remove”. Otherwise,

discard provides a convenient alternative. There is a second way to create a set which

can be faster in some instances. When creating the set, you can pre-populate the set with

a collection of elements. You can see this set contains 4 elements. There is also a faster way to remove elements.

To empty out the set and remove all elements, use the “clear” method. The set now contains

no elements – it has become the empty set. We can move along; there is nothing to see

here. Now that we know how to create and modify

a set, let’s learn how to evaluate the union and intersection of TWO sets. If you have

two sets A and B, then the union is the combination of all elements from the two sets and is denoted

with a U-like symbol… The intersection is the set of elements inside both A and B, and

the symbol for this operation is the flip of the union symbol. To see these in action, let’s look at the

integers from 1 through 10. The odd integers are 1, 3, 5, 7 and 9.

The even integers are 2, 4, 6, 8 and 10. The prime numbers between 1 and 10 are 2,

3, 5 and 7. And finally, the composite integers – the

integers which can be factored – are 4, 6, 8, 9 and 10. The union of the odd and even integers are

all the integers from 1 to 10. You get the same answer if you reverse everything. Notice how the set of odds… and the set

of evens are unchanged. We can find the set of odd prime numbers by

computing the intersection of the sets of odds and primes. There are 3 in the range

1 to 10. And there is only one even prime number … 2. Which integers are both even and odd?

There are none. The intersection of these two sets is the empty set. The union of the prime numbers and composite

numbers are the integers from 2 through 10. Notice 1 is missing – this is because 1 is

neither prime nor composite. Another common operation is testing to see

if one element is inside a set. To do this in Python, use the “in” operator. Is 2

in the set of prime numbers? Yes. This is a true statement. Is 6 an odd integer?

No. This is a false statement. You can also test to see if an element is

NOT in a set. Is this statement true or false?

True. 9 is NOT an even integer, so this is a true statement.

There are many more methods and operations you can perform with sets… Take a moment

to explore these methods. You will not regret it. Sets are a built-in data type in Python. They

come equipped with all the luxury features – unions, intersections, adding elements,

removing elements, and much more. Everything you will ever need for your data hungry code…

provided your sets are finite.

Great lesson. I like the combining of why it's important to use the functions and objects the way Python set them up. Helps me to understand how I will use it in the future and hopefully remember the differences in sets, tuples, list, and dictionaries.

great video Socratica…but why so serious 😀

Wowzers, That was AMAZING! clear and straight to the point. Great job to all involved in producing these! MOAR!!!!!

Hi, as I said, great job but can we take a lill more time to go through all the functions sets or any other class has? Thanx

Very well explained and documented. Thank you!

you are awesome.

This is like Dune 2000 mission brief lol

Upvote for thorium!

what shell are u using?

Wow! This is crystal clear. Hats off to you, Socratica!

جميل جدا جدا جدا .. أن تقدم أعقد المواضيع ببساطة

Really great Python lessons

too scary

I need to watch this video in VR

I absolutely love these videos!

clicking in the "Head"! it is very good indeed.

This is amazing!

brilient ,,,

What a good presentation i liked it !!

I can't believe whole this lecture is free.

Just stunning tutorials. Thank you Socratica.

I like when they vids are to the point.

Hi, i'm quite confused with something. Objects in a set always need to be immutable , then why does the set in example 2 contain a list which is a mutable object?

example2 = set([28, True, 2.71828, "Helium"])

Why does this work?

These are great!

YES FINALLY I'VE BECOME AN ELEMENT OF A SET OF PEOPLE WHO UNDERSTAND SETS

Started at video 1 and i subscribed instant. This is what i needed. short to the point video's. basically spoonfeeding me bit by bit. Already i'm starting to see the immense power of this programming language, i have no previous coding experience, only HTML, CSS and a bit of CISCO CCNA.

This is by far the best method to get started if you do not have much or none experience at all. learning coding is hard and can be frightening at times. the humour really helps relax and focus better. i can't get enough of this and plan to watch out the whole playlist in a binge.

Nice and clear!

The best tutorial series I came across.

great videos ill contribute soon and set up regular contributions

2 in primes,

6 in odds,

a.union(b)

b.union(a),

a.intersection(b),

woh…i like ur expression … love u babez 🙂

For those who are not native It's a little dificult to catch up with the speed of her speaking

Very informational, thank you for creating it 🙂

The lack of views on these videos is absolutely criminal.

What is exact difference between list, tuple, set, dictionary?

Except the good thing No-duplicates, If set doesn't preserve any order, why would anyone want to use it over list or tuple.

Hi ..could you please make some videos that how can we use python for automate stuff ?

Very Useful And Informative. Thank you….. (oh, and great humour too, the style is excellent and I can imagine it might lure in many young minds who will find the series both fun and very useful).

the most unique programming tutorial i have ever seen on YouTube. awesome 🙂

Your videos are great！

These are great videos. Thanks!

Excellent instructional material and I love the dry, dorky humor !

AWESOME

These Videos are sooo good!

Presentation is very good,looking forward for more videos

thanks very helpful and informative!

very intimidating female voice.

Anyone else play these video at 0.75 speed?

Her voice reminds me of Diana from Hitman game series…

Im in love 😍

at 3:00…. "Nothing… peace and quiet" lol… I know that moment all to well when I run a new program for the first time. Great work Socratica!

Which python you use 2 or 3 ?

You explained wonderfully well. I like your videos for many reasons and one of the reasons is that you explain to the point without giving any novice descriptions.

Peace and quiet make me laughing for seconds

omg this is so hard to watch. why can't she just be normal?

Such great content! So informative and accessible!

Can sets be used with the builtin any() and all() ?

really useful and well detailed examples 👍🏽

she reminds me of someone from Carmen Sandiego haha

When this lady speaks I have to obey, understand and remember!

can you do do union and intersection with more than just 2 sets???..thnxz for great vid and visual..lol

I still find the help information really hard to understand. Especially when some are hidden behind the modules tab and need the extra help(math.sin) vs help(sin) etc. Just I need you to explain it first then I can actually understand what the help stuff is trying to tell me….which isn't good.

I keep remember C programming I did a long time ago. always printf scanf….read. And then just masses of text at the start of the program displaying all my variables and functions and everyhting for even teh simplest of programs. Now all I have to do is print(), and just make the variables inside the code as I go instead of loading them in at the start. I totally understand why I was so frustrated and hated learning C now. If they hada taught python or something more intuitive I maybe would be a programmer today.

I hate how things were done growing up, I feel like I got screwed over in many ways for thinking too much about how stupid it was. I thought they would teach us how computers work. instead they taught us C programming language….telling us this was how computers work. The whole time I'm sitting there scratching my head going…..how does the shit I type make the computer do stuff though? How was C created? How can teh computer print hello world when I type a text command? how does it know to read a text command? I mean cmon…at least cover the basics of how the commands are converted to binary and how the computer can read 1's and 0's and all that. I

nstead we had to buy this giant book by the guy who made the course and sit there learning programming theory half the time instead of actually programming or learning how computers work…..PLAN OUT UR PROGRAM BY THINKING WHAT YOU WANT IT TO DO, WRITE DOWN THE VARIOUS STEPS AND THE DESIRED OUTPUT. Christ….No wonder so many people complained about the teacher. I was stuck complaining about the fact it was programming language we were learning, and not how computers work. I never got into programming because of that horrible experience with C. Infact I avoided all computer science just to never deal with c programming again. I barely remember learning any coding in that course at all, pretty sure i could write all the shit I had to do just from this far in the python series. The testing was done on paper via multiple choice exams….like that should tell you enough right there on what a shit programming course it was.

Makes me angry that schools do this to people. There's just soo many of us, they have to herd us like sheeple…..and yet still take our money away in such stupidly large amounts. So many schools are a scam. Students need a way to be proactive and involved in their learning, online stuff like this offers this avenue of success. I'm tired of paying money to learn about shit I can't apply to anything irl.

Plz post the video to find min and max with and without built in function of set plz

Another great video in a great series, thank you! I love the pace of these videos – nice balance of detailed explanation and keeping it moving.

#we want more videos on python and and other programming languages. Please Socratica

same dresssssssssssssssssssssssssssssssssssssssssssssssssssssssssss code

Great explanation thank you! Her tone of voice is really funny at times idk if it was supposed to be haha

put more videos from socratica on udemy and i will spend the money on it with the money i saved for my house …

Thank you for all your effort. I will share your videos to all of my friends who wants to learn python. 🙂

I have become a real fan of: e.g., Socratica, 3Blue1Brown, and Titains of CNC, yes all very different but all very well done!

Is there any chance that you can include MicroPython? Sure Hope So!

In her class~

Student:

*raises hands*umm.. ma'am…… ah…d-d-doubt…….?

Her:

*eyes turns black and starts transforming into a…… Human*Ahhhhhhhhh!!!!!!!!!!!!!!

Student:

*pisses in his pants*I UNDERSTAND EVERYTHING, I UNDERSTAND! I'M SORRY

*Cries*Where have you been all my life! Lol I find myself talking like a robot after seeing this video!

why True value cant be added in a set unlike False

Noticed that the numbers in these sets are sorted. That is a bit un-set-ish, isn't it? Can anyone explain?

How do you add the boolean value False to a set that contains the integer 0?

Thanks.

excellent as usual !

Is she Socratica? I think I'm in love with her.

many "brazilian styles" funny jokes in the script, It´s the reason I like Socratica too much.

We should start a petition to maker her the voice of the next AI.

Why use square bracket after round bracket in the example2 set??

Pitch point tutorial;

This one is increase & inspires my interest on coding!

This lady is amazing 🙂 I really like the way she acts as an Android..

great content i understand python now

I am passing these pyrhon vids onto peeps at work. Really fantastic tuts

I practice safe sets.

why doesn't matter the order? beginner i am 🙂

Can i get a reply without any reason?? Reason i am a student of urs, and a great fan of ur teaching, video has been shared with our college group, thanks

I wish I had seen this video before I wrote code that does all this with lists. :/

Thanks for sharing, I didn't expect to learn something new but I did: set.discard(), nice!

Thanks for sharing, love your videos theme on this topic!

when are you going to upload on hash pyhton?????????????????????????????????????????????????????????????????????

| + – ^ s = list(my_set)

I noticed at the moment to insert a value change a dict the set

the way you communicate its so concise, it's like… def so_clear_socratica():

Can I donate to this channel to make more python videos

Day of creativity :

Algorithm for prime numbers from the integers from 1 to 100 :

integers_1_100 = set(range(1, 100)) # to set integers from 1 to 100

print("integers_1_100 = ", integers_1_100)

integer = 1 # initialize the integers which to compare

while integer <= 100 : # a loop which analize each integer from 1 to 100 included

if integer/1 == 1: # 1 is a composite number not a prime number, a composite

# number is a positive integer that can be formed by multiplying two

# smaller positive integers.

print("integer/1 = ", integer/1)

integers_1_100.discard(integer) # discard 1 from the set of

#integers_1_100

else:

l = 2 # initialize the divisor

while True and (l < integer): #

rest = integer % l # rest value is fill of the rest of the

# integer/divisor

if rest == 0 : # if rest is 0 => the integer is divisible by more

#than two positive divisors

integers_1_100.discard(integer) # so we discard the integer

#inside the set

primes = integers_1_100 # updating the set : prime

break # to this while loop, then go to below to l108

else :

if l < integer – 1: # we need to verify that the divisor is

# less than the integer

l = l + 1 # if it is the case, we add 1 to the divisor and

# we restart this loop

else :

break # else it means that we have tested all possibles

# divisors to check if the integer is a prime number so

# we stop le loop, go to l108

integer = integer + 1 # add 1 to the integer, restart the loop

print("list of prime numbers from 1 to 100 :", primes)

I kind of thought this would be cheesy, but these are some very well put together tutorials! Short, to the point and a very good job of explaining the content. Thank you very much for these

God I loveee this channel