PoojaMoolya: Created page with " {| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Sets in Python'''. |- | 00:06 | In thi..."

2019-06-04T10:33:46Z

Created page with " {| border=1 | <center>'''Time'''</center> | <center>'''Narration'''</center> |- | 00:01 | Welcome to the spoken tutorial on '''Sets in Python'''. |- | 00:06 | In thi..."

New page

{| border=1
| <center>'''Time'''</center>
| <center>'''Narration'''</center>

|-
| 00:01
| Welcome to the spoken tutorial on '''Sets in Python'''.

|-
| 00:06
| In this tutorial, you will learn to, Create '''sets''' from '''lists'''

|-
| 00:12
| Perform '''union, intersection''' and '''symmetric difference operations'''

|-
| 00:18
| Check if a '''set''' is a '''subset''' of other and

Understand various similarities with '''lists'''

|-
| 00:27
| To record this tutorial, I am using

'''Ubuntu Linux 16.04''' operating system

|-
| 00:35
| '''Python 3.4.3 '''and '''IPython 5.1.0'''

|-
| 00:42
| To practise this tutorial, you should know how to run basic '''Python '''commands on the '''ipython console '''and use '''lists'''

|-
| 00:53
| If not, see the relevant '''Python '''tutorials on this website.

|-
| 00:58
| First let us see the overview of '''sets'''.

|-
| 01:02
| '''Sets''' are unordered collections of unique '''elements'''.

|-
| 01:07
| The '''set''' itself is '''mutable'''.

We can add or remove '''items''' from it.

|-
| 01:14
| Let us start '''ipython'''.

Open the '''terminal.'''

|-
| 01:19
| Type '''ipython3 '''and press '''Enter.'''

|-
| 01:24
| From here onwards, remember to press the '''Enter''' key after typing every command on the '''terminal'''.

|-
| 01:31
| Let us look at how to input '''sets'''.

|-
| 01:35
|Type,
'''a''''' underscore '''''list '''''is equal to inside square brackets '''''1 '''''comma''''' 2 '''''comma''''' 1 '''''comma''''' 4 '''''comma''''' 5 '''''comma''''' 6 '''''comma''''' 2'''

|-
| 01:47
|Type, '''a '''''is equal to '''''set '''''inside brackets '''''a '''''underscore '''''list'''

|-
| 01:54
| Then type,''' a'''

|-
| 01:57
|We can see that duplicates are removed and the '''set''' contains only unique '''elements'''.

|-
| 02:03
| '''Sets''' can also be created directly as follows

|-
| 02:08
|Type, '''b '''''is equal to inside curly braces '''''1 '''''comma''''' 2 '''''comma''''' 1 '''''comma''''' 4 '''''comma''''' 5 '''''comma''''' 6 '''''comma''''' 2'''

|-
| 02:19
|Type, '''b'''. As before, we see that the '''set''' contains only unique '''elements'''.

|-
| 02:27
| To create an''' empty set, '''type, '''c '''''is equal to '''''set '''''open and close brackets''

|-
| 02:36
|Note that '''d '''''is equal to open and close curly braces'' creates an empty dictionary, not an empty '''set'''.

|-
| 02:45
| '''Sets''' can contain '''numbers, strings''' and '''tuples.'''

But cannot contain '''mutable elements''' such as '''lists''' or '''dictionaries'''.

|-
| 02:56
| Type, '''b '''''underscore '''''list '''''is equal to inside square brackets again inside square brackets '''''1 '''''comma''''' 2 '''''comma''''' 1''' ''comma''''' 6 '''''comma''''' 2 '''

|-
| 03:09
| Now type, '''b '''''is equal to''''' set '''''inside brackets '''''b '''''underscore '''''list'''

|-
| 03:17
| As you can see, it gives a '''TypeError.'''

|-
| 03:21
| Now let us perform some '''operations''' on '''sets'''.

For this, we will first create a pair of '''sets.'''

|-
| 03:29
| Type the '''sets''' as shown.

|-
| 03:33
| Here, '''f '''is the '''set''' of '''fibonacci''' numbers from 1 to 10.

|-
| 03:39
| And '''p''' is the '''set''' of '''prime''' numbers from 1 to 15.''' '''

|-
| 03:44
| Various '''operations''' can be performed on '''sets'''.

|-
| 03:47
| First we will add an '''element''' to a '''set''' by using '''add method'''.

|-
| 03:53
| Type, '''f '''''dot '''''add''''' inside brackets '''''13'''

|-
| 03:58
| Now type, '''f'''

As you can see, '''13 '''is added to the set '''f.'''

|-
| 04:06
| '''add method''' has no effect if the '''element''' is already present.

|-
| 04:11
| Type, '''f '''''dot''''' add '''''inside brackets''''' 13'''

|-
| 04:16
| Type, '''f'''

As you can see, '''13 '''is not added this time.

|-
| 04:23
| Next we will learn to remove an '''element''' using '''remove method'''.

|-
| 04:28
| Type, '''p '''''dot '''''remove '''''inside brackets '''''13'''

|-
| 04:34
| Now type, '''p'''. As you can see, '''13 '''is removed from the set '''p'''.

|-
| 04:41
| If the '''element''' is not a '''member''', it raises a '''KeyError.'''

|-
| 04:46
| Type, '''p '''''dot '''''remove '''''inside brackets '''''18'''

|-
| 04:52
| '''KeyError '''is raised since '''element 18 '''is not present in '''p.'''

|-
| 04:57
| The''' pipe''' character stands for '''union.'''

|-
| 05:01
| Type, '''f '''''pipe''''' p '''

|-
| 05:06
| Or type, '''f '''''dot '''''union '''''inside brackets '''''p'''

It gave the '''union''' of '''f '''and''' p '''

|-
| 05:16
| The '''ampersand''' character stands for '''intersection'''.

|-
| 05:20
| Type, '''f '''''ampersand''''' p'''

Or type, '''f '''''dot '''''intersection '''''inside brackets '''''p '''

|-
| 05:30
| It gave the '''intersection''' of '''f''' and '''p.'''

|-
| 05:34
| Type, '''f '''''minus''''' p'''

Or type, '''f '''''dot '''''difference '''''inside brackets '''''p'''

|-
| 05:44
| It gave all the '''elements''' that are in '''f''' but not in '''p'''.

|-
| 05:50
| Type, '''f '''''caret''''' p'''

|-
| 05:54
| Or type, '''f '''''dot '''''symmetric '''''underscore '''''difference '''''inside brackets '''''p'''

|-
| 06:01
| It gives all the '''elements''' in '''f''' '''union''' '''p''' but not in '''f''' '''intersection''' '''p'''.

|-
| 06:08
| In mathematical terms, it gives the '''symmetric difference'''.

|-
| 06:13
| '''Sets''' also support checking of '''subsets'''.

|-
| 06:17
| Type, '''a '''''is equal to '''''set''''' inside brackets inside square brackets '''''1 '''''comma '''''2 '''''comma '''''3 '''''comma '''''4'''

|-
| 06:27
| Type, '''b '''''is equal to '''''set '''''inside brackets inside square brackets '''''1 '''''comma''''' 2 '''

|-
| 06:35
| Now type, '''b''''' less than or equal to '''''a'''

Or type, '''b '''''dot '''''issubset '''''inside brackets '''''a'''

|-
| 06:47
| It gives ''' True '''since '''b''' is a '''subset''' of '''a. '''

|-
| 06:52
| '''Sets''' also support checking of '''supersets'''.

Type, '''b '''''greater than or equal to '''''a'''

|-
| 07:01
| Or type, '''b '''''dot '''''issuperset '''''inside brackets '''''a'''

|-
| 07:08
| We get '''False''' since '''b '''is not a superset of '''a'''.

|-
| 07:14
| Every '''set''' is a '''subset''' as well as a '''superset''' of itself.

|-
| 07:20
| Type, '''a '''''less than or equal to '''''a'''

'''a''''' greater than or equal to '''''a'''

|-
| 07:28
| It gives '''True''' in both cases since''' a '''is a''' superset '''and''' subset''' of itself'''. '''

|-
| 07:35
| Elements of a '''set''' can be accessed using '''for loop'''.

|-
| 07:39
| Type, '''for x in a '''''colon'' '''print '''''inside brackets '''''x'''

|-
| 07:47
| The '''items''' from the '''set''' will not appear in any specific order.

|-
| 07:52
| The '''length''' and '''containership''' check on '''sets''' are similar as in '''lists''' and '''tuples'''.

|-
| 07:59
| Type, '''len '''''inside brackets '''''a '''

It shows 4'''. '''

|-
| 08:07
| Type,

'''1 in a'''

'''7 in a'''

|-
| 08:13
| It prints''' True '''and''' False '''respectively''' '''

|-
| 08:18
| '''Sets''' do not support '''indexing'''.

Hence, '''slicing''' and '''striding''' are not valid on '''sets'''.

|-
| 08:25
| Pause the video.

Try this exercise and then resume the video.

|-
| 08:31
| Given a list of marks, as shown, list all the duplicate marks.

|-
| 08:37
| Switch to the '''terminal''' for the solution.

|-
| 08:41
| Type, '''marks '''''is equal to inside square brackets '''''20''''' comma''''' 23''''' comma''''' 22''''' comma''''' 23''''' comma''''' 20''''' comma''''' 21''''' comma''''' 23 '''

|-
| 08:53
| '''marks '''''underscore '''''set '''''is equal to '''''set '''''inside brackets '''''marks'''

|-
| 09:00
| '''for num in marks '''''underscore '''''set''''' colon''

'''marks''''' dot '''''remove '''''inside brackets '''''num'''

|-
| 09:10
| '''remove method''' only removes the first occurrence of an '''element''' from the '''list'''.

|-
| 09:17
| Type, '''duplicates '''''is equal to '''''set''''' inside bracket '''''marks '''

|-
| 09:24
| Now type, '''duplicates'''

|-
| 09:28
| We now have duplicate marks in the '''set duplicates.'''

Hence, we have obtained our required solution.

|-
| 09:37
| This brings us to the end of this tutorial. Let us summarize.

|-
| 09:43
| In this tutorial, we have learnt to, Make '''sets''' from '''lists '''or by using curly braces

|-
| 09:50
| Perform '''union, intersection''' and '''symmetric difference operations'''

|-
| 09:55
| Check if a '''set''' is a '''subset''' of other using the ''less than or equal to'' operator

|-
| 10:02
| Understand the various similarities with '''lists''' like length and containership

|-
| 10:08
| Here are some self assessment questions for you to solve.

|-
| 10:12
| First. If '''a '''is assigned as follows, what is '''set '''''of'' '''a'''

|-
| 10:18
| Second. Given '''odd''' and '''squares''' as shown. How do you find the '''symmetric difference''' of these two '''sets'''?

|-
| 10:27
| Third. If '''a''' is a '''set''', how do you check if a variable '''b''' exists in '''a'''?

|-
| 10:34
| And the answers,

First. '''set '''''of '''''a''' will have all the common '''elements''' in the '''list''' '''a''', that is 1 ''comma'' 2 ''comma'' 3 ''comma'' 5 ''comma'' 8.

|-
| 10:46
| Second. To find the '''symmetric difference''' between two '''sets''', we use the operator ''caret''. So we can type '''odd '''''caret '''''squares'''

|-
| 10:56
| Third. To check the containership, we type, '''b in a'''

|-
| 11:01
| Please post your timed queries in this forum.

|-
| 11:05
| Please post your general queries on Python in this forum.

|-
| 11:10
| FOSSEE team coordinates the TBC project.

|-
| 11:15
| Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India.

For more details, visit this website.

|-
| 11:25
| This is Priya from IIT Bombay signing off.

Thanks for watching.

|}

Python-3.4.3/C3/Sets-in-Python/English-timed - Revision history

PoojaMoolya: Created page with " {| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Sets in Python'''. |- | 00:06 | In thi..."