Python/C3/Sets/English-timed

Time	Narration
00:00	Hello friends and welcome to the tutorial on 'Sets'.
00:05	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.
00:25	Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with List"
00:35	Now, type ipython in the command.
00:43	So, What are sets?
00:46	Sets are data structures which contain unique elements.
00:49	In other words, duplicates are not allowed in sets.
00:54	Lets look at how to input sets.
00:59	So type a underscore list is equal to within brackets 1,2,1,4,5,6,2.
01:15	Then a is equal to set in brackets 'a' underscore list.
01:25	Then type 'a'.
01:28	We can see that duplicates are removed and the set contains only unique elements.
01:31	Now let us perform some operations on sets.
01:35	For this, we shall first create a pair of sets
01:40	f10 is equal to set in brackets and square brackets 1,2,3,5,8
01:54	p10 is equal to set of within brackets and square brackets 2,3,5,7.
02:07	f10 is the set of fibonacci series numbers from 1 to 10.
02:19	p10 is the set of prime numbers from 1 to 10.
02:22	Various operations can be performed on sets.
02:25	For example, The vertical bar and in bracket pipe character stands for union.
02:37	So type f10 then a vertical bar then p10 and hit Enter.
02:46	It gave the union of f10 and p10.
02:50	The ampersand character stands for intersection.
02:53	So type f10 ampersand p10.
03:00	It gave the intersection of f10 and p10 similarly.
03:05	f10 - p10 gives all the elements that are in f10 but not in p10 .
03:13	So type f10 hyphen p10
03:22	and f10 charat p10 gives all the elements in f10 union p10 but not in f10 intersection p10. So type f10 charat p10.
03:40	In mathematical terms, it gives the symmetric difference.
03:46	Sets also support checking of subsets.
03:50	So lets type b is equal to in brackets and square brackets 1,2.
04:00	Then b is less than f10.
04:05	It gives a True since b is a proper subset of f10.
04:09	Similarly, type f10 less than f10.
04:15	It gives a False since f10 is not a proper subset.
04:19	Hence the right way to do would be f10 less than or equal to f10.
04:31	we get a True since every set is a subset of itself.
04:37	Sets can be iterated upon just like lists and tuples.
04:42	for i in f10 colon in the command and then type print i comma
05:01	It prints the elements of f10.
05:03	The length and container ship check on sets is similar as in lists and tuples.
05:12	So type len within brackets f10 and hit Enter.
05:22	And It shows 5, type 1 in f10.
05:27	Then type 2 in f10.
05:33	And prints True and True respectively
05:45	Now, pause the video here, try out the following exercise and resume the video.
05:50	Given a list of marks, marks is equal to within square brackets 20, 23, 22, 23, 20, 21, 23
06:01	list all the duplicates
06:04	Duplicates marks are the marks left out when we remove each element of the list exactly one time.
06:13	So type marks is equal to in square brackets 20,23,22,23,20,21,23.
06:33	Then type marks underscore set is equal to set within bracket marks.
06:44	then for mark in marks underscore set colon, then marks dot remove within brackets mark.
07:05	We are now left with only duplicates in the list marks +
07:10	Hence Type duplicates is equal to set marks and hit enter.
07:24	Then type duplicate.
07:27	Hence, We obtained our required solution
07:30	This brings us to the end of the tutorial.
07:34	In this tutorial, we have learnt to,
07:36	Make sets from lists.
07:37	, & and ^ respectively.
07:49	Check if a set is a subset of other using the ' and ' = operators.
07:58	Then, Understand various similarities with lists like length and containership.
08:05	Here are some self assessment questions for you to solve
08:09	First one, If a is equal to within square brackets 1, 1, 2, 3, 3, 5, 5, 8
08:18	And What is set(a)
08:23	The options are
08:26	set within brackets and square brackets 1, 1, 2, 3, 3, 5, 5, 8
08:31	Second one set within brackets 1, 2, 3, 5, 8
08:36	Then the third option set([1, 2, 3, 3, 5, 5])
08:41	Then the last option is Error.
08:43	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
08:57	How do you find the symmetric difference of these two sets?
09:02	The third questions is, a is a set.
09:05	how do you check if a variable b exists in a ?
09:11	Now And the answers,
09:15	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
09:28	The Second answer is , To find the symmetric difference between two sets, we use the operator charat.
09:37	So type odd charat squares
09:42	Final answer is, To check the container ship, we say,
09:45	b in a
09:50	So Hope you have enjoyed this tutorial and found it useful.
09:53	Thank you!

Contributors and Content Editors

Gaurav, Minal, PoojaMoolya, Sneha