Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated:
1
00:00:00,690 --> 00:00:01,650
Welcome back.
2
00:00:01,740 --> 00:00:06,660
The methods we're going to talk about when it comes to sets are right here.
3
00:00:06,660 --> 00:00:10,490
It looks like a lot but they're quite similar so hang in there.
4
00:00:10,530 --> 00:00:19,020
I have two sets for us are my set which is one through five and then your set which is four through
5
00:00:19,020 --> 00:00:20,490
10.
6
00:00:20,490 --> 00:00:24,580
Now let's go one by one and see what these methods do.
7
00:00:24,710 --> 00:00:32,060
And if you've ever seen Venn diagrams in your school for example two circles that are overlapping each
8
00:00:32,060 --> 00:00:32,410
other.
9
00:00:32,510 --> 00:00:35,500
What we're about to do is quite similar to this.
10
00:00:35,780 --> 00:00:43,190
The first one is difference and sets are very useful when having two sets and comparing them to each
11
00:00:43,190 --> 00:00:44,050
other.
12
00:00:44,060 --> 00:00:51,350
So for example in here difference simply says my set dot difference and we give it another set such
13
00:00:51,350 --> 00:00:52,790
as your set.
14
00:00:52,880 --> 00:01:01,190
If I print this right here and I click Run I get one two three.
15
00:01:01,400 --> 00:01:05,030
It's going to find the difference of the first.
16
00:01:05,030 --> 00:01:14,280
My set with your set so any duplicates between the two which is four and five gets ignored and it only
17
00:01:14,280 --> 00:01:15,350
shows the difference.
18
00:01:15,420 --> 00:01:16,920
That is one two three.
19
00:01:16,920 --> 00:01:21,020
What's different between my set and your set when viewed from my set.
20
00:01:21,030 --> 00:01:24,290
Well your set doesn't have one two three.
21
00:01:24,330 --> 00:01:34,150
What about the next one discard again if we do my set DOD discard it says it removes an element from
22
00:01:34,150 --> 00:01:50,720
a set if it is a member so here we can say discard five and if I do print my set and I click Run I get
23
00:01:50,780 --> 00:02:02,190
none but if I print here my set and I click Run I get one two three four because we've just discarded
24
00:02:02,430 --> 00:02:12,220
Five it modifies our set just to keep our working space clean I'm going to comment this out next is
25
00:02:12,280 --> 00:02:19,770
difference update so I'm going to say my set and then once again let's see what difference update does
26
00:02:21,260 --> 00:02:25,670
remove all elements of another set from this set.
27
00:02:25,670 --> 00:02:39,020
So if I do your set here and once again I do print and I click Run I get none because it just modifies
28
00:02:39,140 --> 00:02:39,740
my set.
29
00:02:39,740 --> 00:02:52,200
So remember we just have to have our print my set and now this my set is updated with just one two and
30
00:02:52,200 --> 00:02:57,500
three because we're updating it so that the differences are removed.
31
00:02:57,510 --> 00:03:04,350
So four and five are removed unlike difference where it just told you the difference without changing
32
00:03:05,480 --> 00:03:18,070
again if we go back here and simply do my set and I click Run you see that my set here was not modified
33
00:03:18,430 --> 00:03:26,280
right here but then my set bottom was modified because of difference update right.
34
00:03:26,360 --> 00:03:27,730
A few more to go.
35
00:03:27,800 --> 00:03:36,170
Intersection and this one once again my set and in here once again let's see what it does.
36
00:03:36,290 --> 00:03:39,980
It just has intersection with something else.
37
00:03:39,980 --> 00:03:40,920
Well let's find out.
38
00:03:41,180 --> 00:03:49,920
If I do your set here and I do print and I run this it's going to give me four or five because that's
39
00:03:49,920 --> 00:03:56,310
the intersection the two common things that my set and your set has.
40
00:03:56,410 --> 00:04:00,320
What about is this joint well.
41
00:04:00,330 --> 00:04:08,700
If I do my set and then your sect feel like I'm saying those words over and over.
42
00:04:08,700 --> 00:04:10,150
Hopefully that's not too annoying.
43
00:04:11,430 --> 00:04:16,730
And then here if let's comment this out we run this.
44
00:04:16,860 --> 00:04:22,630
I get false is disjoint simply says hey are those two circles overlapping.
45
00:04:22,680 --> 00:04:29,530
Do they have anything in common if for example my said didn't had four didn't have four and five and
46
00:04:29,530 --> 00:04:36,420
I click Run I get true because it's disjointed means these sets have nothing in common.
47
00:04:38,330 --> 00:04:38,860
Awesome.
48
00:04:38,870 --> 00:04:39,610
Just a few more.
49
00:04:41,310 --> 00:04:52,580
The next ones we're gonna see is is subset and is superset but actually before we do that let's do union.
50
00:04:52,710 --> 00:04:54,580
Let's see what this does.
51
00:04:54,600 --> 00:04:58,190
Union will say my set
52
00:05:00,960 --> 00:05:05,980
and in here we want to add the other set your set.
53
00:05:05,980 --> 00:05:16,980
If we print this and click Run I get one two three four five six seven eight nine 10.
54
00:05:17,190 --> 00:05:18,670
What did that just do.
55
00:05:18,690 --> 00:05:26,310
Well union just united these sets together but removed any duplicates.
56
00:05:26,310 --> 00:05:28,710
That's kind of nice.
57
00:05:28,830 --> 00:05:31,700
And as you can see it created a new set for us.
58
00:05:31,710 --> 00:05:39,500
It returned to a new set by the way there's actually a shorthand that you can do here in python which
59
00:05:39,500 --> 00:05:47,370
is the shift and then the key above your enter which is right here the straight line.
60
00:05:47,420 --> 00:05:51,410
So shift and then the backslash.
61
00:05:51,410 --> 00:05:54,250
But if you press shift you'll get this that all straight line.
62
00:05:54,590 --> 00:05:59,430
If you print this will remove the brackets here.
63
00:05:59,590 --> 00:06:04,920
Let's run again and you see that works as well.
64
00:06:05,000 --> 00:06:08,600
And by the way this also exists for intersection.
65
00:06:08,720 --> 00:06:14,540
Again you don't see it that often but with intersection you can do the same thing where you just do
66
00:06:14,540 --> 00:06:17,210
the end.
67
00:06:17,400 --> 00:06:18,870
And if you do that
68
00:06:21,790 --> 00:06:26,470
it gives you the intersection of my set and your set.
69
00:06:26,490 --> 00:06:29,470
All right I promise you this is going to be short.
70
00:06:29,460 --> 00:06:36,380
So two other ones is subset and is superset as you can imagine.
71
00:06:36,520 --> 00:06:44,880
My set if let's say my set only has four and five and I say hey is my set.
72
00:06:45,000 --> 00:06:47,660
Is that a subset of your set.
73
00:06:47,910 --> 00:06:58,440
And I print this if I click Run it's true my set is a subset that is it's inside of the circle of your
74
00:06:58,500 --> 00:07:01,710
set because four and five is inside of it.
75
00:07:01,740 --> 00:07:10,700
So my set the entirety of my set is inside of this other set which we call a subset.
76
00:07:10,910 --> 00:07:16,880
On the other hand we also have this idea of superset.
77
00:07:16,880 --> 00:07:27,810
So if I do instead of is subset is superset I'll get false because while my set is not a superset it
78
00:07:27,810 --> 00:07:29,760
doesn't encompass your set.
79
00:07:29,760 --> 00:07:31,990
It's the other way around.
80
00:07:32,490 --> 00:07:36,870
Your set is a superset of my set
81
00:07:40,000 --> 00:07:47,980
because your set encompasses everything that my set has which is four and five homeboy.
82
00:07:48,060 --> 00:07:48,930
That was a lot.
83
00:07:48,930 --> 00:07:53,030
And you're asking yourself there is no way I'm going to memorize any of that.
84
00:07:53,490 --> 00:07:54,340
Well good.
85
00:07:54,360 --> 00:07:56,910
I don't memorize any of this either.
86
00:07:57,210 --> 00:08:04,530
As a matter of fact I usually go to the Python documentation or just google around and because I know
87
00:08:04,530 --> 00:08:11,400
sets exist if I ever want to compare let's say two sets I know to just go here and find the tool that
88
00:08:11,460 --> 00:08:12,180
I want.
89
00:08:12,180 --> 00:08:15,540
That's the cue of a programmer that I keep mentioning over and over.
90
00:08:15,540 --> 00:08:16,900
It's not memorization.
91
00:08:17,040 --> 00:08:20,600
It's the ability to know that there's tools that you can use.
92
00:08:20,700 --> 00:08:22,690
And being able to Google for them.
93
00:08:22,800 --> 00:08:28,080
I know it doesn't sound exciting because in movies you see everybody typing super fast encoding everything
94
00:08:28,110 --> 00:08:31,350
but that's just not real life in real life.
95
00:08:31,350 --> 00:08:37,500
You just google around find solutions because by now you know what sets are you know what sets can do
96
00:08:37,800 --> 00:08:42,980
so that you can google for methods that are appropriate to your problem.
97
00:08:43,110 --> 00:08:44,600
I'll see you in the next one by.
9460
Can't find what you're looking for?
Get subtitles in any language from opensubtitles.com, and translate them here.
Afrikaans
Akan
Albanian
Amharic
Arabic
Armenian
Azerbaijani
Basque
Belarusian
Bemba
Bengali
Bihari
Bosnian
Breton
Bulgarian
Cambodian
Catalan
Cebuano
Cherokee
Chichewa
Chinese (Simplified)
Chinese (Traditional)
Corsican
Croatian
Czech
Danish
Dutch
English
Esperanto
Estonian
Faroese
Finnish
Galician
Georgian
German
Greek
Guarani
Haitian Creole
Hausa
Hawaiian
Hebrew
Hmong
Hungarian
Icelandic
Indonesian
Irish
Italian
Japanese
Kazakh
Kinyarwanda
Kirundi
Kongo
Korean
Krio (Sierra Leone)
Kurdish
Kyrgyz
Laothian
Latin
Latvian
Lithuanian
Luganda
Luo
Luxembourgish
Macedonian
Malagasy
Malay
Maltese
Maori
Mauritian Creole
Moldavian
Mongolian
Myanmar (Burmese)
Montenegrin
Nepali
Norwegian
Pashto
Persian
Polish
Portuguese (Brazil)
Portuguese (Portugal)
Quechua
Romanian
Romansh
Russian
Samoan
Scots Gaelic
Serbo-Croatian
Sesotho
Setswana
Seychellois Creole
Shona
Sindhi
Sinhalese
Slovak
Slovenian
Somali
Spanish
Swedish
Tajik
Thai
Tigrinya
Tonga
Turkish
Turkmen
Ukrainian
Uzbek
Vietnamese
Welsh
Wolof