Python/C3/Sets/English-timed

Timing	Narration
0:00	Hello friends and welcome to the tutorial on 'Sets'.
0:05	At the end of this tutorial, you will be able to, Create sets from lists. Perform union, intersection and symmetric difference operations. Check if a set is a subset of other. Understand various similarities with lists like length and containership.
0:25	Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with List"
0:35	Now, type ipython in the command.
0:43	So, What are sets?
0:46	Sets are data structures which contain unique elements.
0:49	In other words, duplicates are not allowed in sets.
0:54	Lets look at how to input sets.
0:59	So type a underscore list is equal to within brackets 1,2,1,4,5,6,2.
1:15	Then a is equal to set in brackets a underscore list.
1:25	Then type a.
1:28	We can see that duplicates are removed and the set contains only unique elements.
1:31	Now let us perform some operations on sets.
1:35	For this, we shall first create a pair of sets
1:40	f10 is equal to set of within brackets and square brackets 1,2,3,5,8
1:54	p10 is equal to set of within brackets and square brackets 2,3,5,7.
2:07	f10 is the set of fibonacci series numbers from 1 to 10.
2:19	p10 is the set of prime numbers from 1 to 10.
2:22	Various operations can be performed on sets.
2:25	For example, The vertical bar and in bracket pipe character stands for union.
2:37	So type f10 then a vertical bar p10 and hit Enter.
2:46	It gave the union of f10 and p10.
2:50	The ampersand character stands for intersection.
2:53	So type f10 ampersand p10.
3:00	It gave the intersection of f10 and p10 similarly.
3:05	f10 - p10 gives all the elements that are in f10 but not in p10 .
3:13	So type f10 hyphen p10
3:22	and f10 charat p10 gives all the elements in f10 union p10 but not in f10 intersection p10. So type f10 charat p10.
3:40	In mathematical terms, it gives the symmetric difference.
3:46	Sets also support checking of subsets.
3:50	So lets type b is equal to within brackets and square brackets 1,2.
4:00	Then b is less than f10.
4:05	It gives a True since b is a proper subset of f10.
4:09	Similarly, type f10 less than f10.
4:15	It gives a False since f10 is not a proper subset.
4:19	Hence the right way to do would be f10 less than or equal to f10.
4:31	we get a True since every set is a subset of itself.
4:37	Sets can be iterated upon just like lists and tuples.
4:42	for i in f10 colon in the command and then type print i comma
5:01	It prints the elements of f10.
5:03	The length and containership check on sets is similar as in lists and tuples.
5:12	So type len within brackets f10 and hit Enter.
5:22	And It shows 5, type 1 in f10.
5:27	Then type 2 in f10.
5:33	And prints True and True respectively
5:45	Now, pause the video here, try out the following exercise and resume the video.
5:50	Given a list of marks, marks is equal to within square brackets 20, 23, 22, 23, 20, 21, 23
6:01	list all the duplicates
6:04	Duplicates marks are the marks left out when we remove each element of the list exactly one time.
6:13	So type marks is equal to within square brackets 20,23,22,23,20,21,23.
6:33	Then type marks underscore set is equal to set within bracket marks.
6:44	then for mark in marks underscore set colon, then marks dot remove within brackets mark.
7:05	We are now left with only duplicates in the list marks
7:10	Hence Type duplicates is equal to set within brackets marks and hit enter.
7:24	Then type duplicate.
7:27	Hence, We obtained our required solution
7:30	This brings us to the end of the tutorial.
7:34	In this tutorial, we have learnt to,
7:36	Make sets from lists.
7;37	, & and ^ respectively.
7:49	Check if a set is a subset of other using the < and <= operators.
7:58	Then, Understand various similarities with lists like length and containership.
8:05	Here are some self assessment questions for you to solve
8:09	1. First one, If a is equal to within square brackets 1, 1, 2, 3, 3, 5, 5, 8.
8:18	And What is set(a)
8:23	The options are
8:26	set within brackets and square brackets 1, 1, 2, 3, 3, 5, 5, 8
8:31	Second one set within brackets 1, 2, 3, 5, 8
8:36	Then the third option set([1, 2, 3, 3, 5, 5])
8:41	Then the last option is Error.
8:43	2. Second question, odd is equal to set within brackets 1, 3, 5, 7, 9 and squares is equal to set within brackets 1, 4, 9, 16.
8:57	How do you find the symmetric difference of these two sets?
9:02	3. The third questions is, a is a set.
9:05	how do you check if a variable b exists in a?
9:11	Now And the answers,
9:15	1. First answer is, set of a will have all the common elements in the list a, that is set within brackets 1, 2, 3, 5, 8.
9:28	2. The Second answer is , To find the symmetric difference between two sets, we use the operator charat.
9:37	So type odd charat squares
9:42	3. Final answer is, To check the containership, we say,
9:45	b in a
9:50	So Hope you have enjoyed this tutorial and found it useful.
9:53	Thank you!

Contributors and Content Editors

Gaurav, Minal, PoojaMoolya, Sneha