1
00:00:00,820 --> 00:00:08,260
By the way, there is actually one more way that we've actually seen in lists how to look for an item

2
00:00:08,470 --> 00:00:09,340
in a dictionary.

3
00:00:10,750 --> 00:00:19,120
Remember how enlists we used the key word when we said something along the lines of, hey, is I in

4
00:00:19,690 --> 00:00:26,170
a list that contains I or we even used a string like, hi?

5
00:00:27,130 --> 00:00:29,440
Well, you can do the same with dictionaries.

6
00:00:29,950 --> 00:00:34,660
I can say, does Baskett exist in user?

7
00:00:35,470 --> 00:00:37,180
And let's print this out.

8
00:00:42,600 --> 00:00:45,900
And it's going to say, yep, basket does exist and user.

9
00:00:46,470 --> 00:00:49,770
What about what about size?

10
00:00:50,820 --> 00:00:51,660
Does that exist?

11
00:00:52,480 --> 00:00:53,500
No, that's false.

12
00:00:53,550 --> 00:00:59,090
That does not exist in user, but here is where it gets really interesting.

13
00:00:59,550 --> 00:01:04,790
And this, again, is a nother dictionary method that we can use.

14
00:01:05,220 --> 00:01:12,510
And by the way, you can see that there's not that many dictionary methods that, well, dictionaries

15
00:01:12,510 --> 00:01:12,780
have.

16
00:01:13,530 --> 00:01:15,690
Luckily, we're going to go over the main ones here.

17
00:01:16,700 --> 00:01:19,490
The one is called Ki's.

18
00:01:20,950 --> 00:01:26,840
And Keyes simply checks the keys, what are the keys of user?

19
00:01:27,130 --> 00:01:30,280
So if I go hello here and I click Run.

20
00:01:32,390 --> 00:01:41,000
Well, no keys, sorry, on this side, not this, so this is a value, so if I want to check keys,

21
00:01:41,000 --> 00:01:42,190
I'd say age.

22
00:01:44,190 --> 00:01:49,340
Which is true, but if I want to check a values well, in that case, if I do.

23
00:01:49,380 --> 00:01:49,950
Hello?

24
00:01:51,710 --> 00:01:58,160
I get true it's going to go over or what we call iterate over.

25
00:01:59,240 --> 00:02:08,120
The values, another one that's really useful is the items and items is special because we've seen keys

26
00:02:08,120 --> 00:02:13,510
and values, but items actually grabs the entire item.

27
00:02:14,300 --> 00:02:20,120
So the way we can actually see this is let's just remove and click run.

28
00:02:22,970 --> 00:02:34,160
This is interesting, I have DECT items here and I grab looks like a list, and in here we have a bracket

29
00:02:34,160 --> 00:02:38,270
basket one, two, three, great yellow and H20.

30
00:02:38,390 --> 00:02:43,970
But there's some weird syntax here that we haven't seen before, and this is actually a tuple.

31
00:02:44,180 --> 00:02:49,130
So we're going to hold off on this and talk about this a little bit more when we talk about our next

32
00:02:49,130 --> 00:02:49,970
data structure.

33
00:02:50,750 --> 00:02:57,780
But keys, values and items is an easy way for us to grab these things for us from our dictionary.

34
00:02:58,760 --> 00:03:01,970
Let's continue on with other dictionary methods that we might use.

35
00:03:02,690 --> 00:03:04,570
One is a very nice one.

36
00:03:04,610 --> 00:03:05,210
It's called.

37
00:03:06,740 --> 00:03:07,220
Clear.

38
00:03:07,940 --> 00:03:09,170
And if I run this.

39
00:03:10,810 --> 00:03:12,980
You see that I get an empty dictionary.

40
00:03:13,840 --> 00:03:19,840
What if I just run users clear here and run user?

41
00:03:22,230 --> 00:03:31,350
Well, it's still an empty object or an empty dictionary, so you can see here that clear doesn't actually

42
00:03:31,350 --> 00:03:32,570
return anything.

43
00:03:32,580 --> 00:03:38,040
It doesn't well is just in place, removes whatever the dictionary has.

44
00:03:38,050 --> 00:03:40,350
So it just creates an empty dictionary.

45
00:03:42,060 --> 00:03:42,750
What about.

46
00:03:43,710 --> 00:03:44,180
Copy?

47
00:03:45,420 --> 00:03:56,970
Well, a copy allows us to copy a user so that if I print user and user too, and I click run.

48
00:03:58,480 --> 00:04:05,470
I get two users each keys and values copy, but if I now let's say.

49
00:04:06,830 --> 00:04:10,610
Clear the first user and I click run.

50
00:04:12,080 --> 00:04:18,680
The first user is empty, but because I've copied the second user, the second user has the old information.

51
00:04:20,290 --> 00:04:22,570
And this is a concept that we've talked about before.

52
00:04:24,500 --> 00:04:34,280
Another useful command and let's just go back to having user is user dot pop, which removes a key and

53
00:04:34,280 --> 00:04:35,910
a value from the dictionary.

54
00:04:36,140 --> 00:04:42,310
So in our case, let's just say we want to remove the key that is age.

55
00:04:42,500 --> 00:04:43,820
So I'm going to say age.

56
00:04:44,270 --> 00:04:45,620
And if I run this.

57
00:04:46,830 --> 00:04:55,860
I get 20 because pop returns the value of whatever got removed, but if I do print user now, you'll

58
00:04:55,860 --> 00:05:00,000
see that age does not exist anymore because we've popped it off.

59
00:05:00,360 --> 00:05:04,860
But Pop, as you can see, removes the actual value.

60
00:05:05,920 --> 00:05:15,220
Or returns the actual value 20, here's another really fun one pop item, and honestly, this, I haven't

61
00:05:15,220 --> 00:05:20,590
used much, but I just think it's a fun one pop item, if you guessed well, you're not going to guess.

62
00:05:21,670 --> 00:05:28,300
Oh, and that's because I have to make sure I write it properly with lowercase if I run this.

63
00:05:30,450 --> 00:05:34,020
What just happened, it randomly pops up something.

64
00:05:35,090 --> 00:05:41,870
One of the keys and the values in this case, age 20, is removed, so the last item on the dictionary

65
00:05:41,870 --> 00:05:42,500
gets removed.

66
00:05:42,500 --> 00:05:45,670
But remember, a dictionary is unordered.

67
00:05:45,800 --> 00:05:52,310
So if this was a massive, massive dictionary that, well, doesn't have any order to it.

68
00:05:53,150 --> 00:06:01,120
Sometimes it removes some paire, as you can see, not the last one, but some pair of key value.

69
00:06:02,060 --> 00:06:04,100
So you have to be careful with this one.

70
00:06:04,100 --> 00:06:09,470
It doesn't necessarily just remove the last thing that you entered, but it might be useful on some

71
00:06:09,470 --> 00:06:09,980
occasions.

72
00:06:10,640 --> 00:06:13,130
Finally, we have something called update.

73
00:06:13,520 --> 00:06:18,220
An update simply updates, as the name suggests, a key value.

74
00:06:19,220 --> 00:06:20,840
So let's have a look here.

75
00:06:21,200 --> 00:06:24,920
All we have to do is give it a new dictionary.

76
00:06:24,920 --> 00:06:32,780
So curly brackets just simply say, hey, I want to update age to fifty five.

77
00:06:34,140 --> 00:06:35,550
Fight, click, run.

78
00:06:37,690 --> 00:06:40,960
Oh, and I forgot a bracket here, let's try that again if I click run.

79
00:06:43,010 --> 00:06:43,550
There you go.

80
00:06:43,700 --> 00:06:46,610
Age got updated, but if.

81
00:06:47,970 --> 00:06:56,250
This was a key that doesn't exist like ages and I click run, it will still update with a new key item.

82
00:06:57,250 --> 00:06:59,630
So this is another really useful method.

83
00:07:00,400 --> 00:07:02,710
All right, that's it for dictionaries.

84
00:07:02,770 --> 00:07:04,150
I'll see you in the next video.