1
00:00:00,540 --> 00:00:01,150
Welcome back.

2
00:00:01,710 --> 00:00:04,410
Let's talk about something called escape.

3
00:00:06,790 --> 00:00:07,480
Sequence.

4
00:00:11,520 --> 00:00:19,020
Let's comment this out and let me ask you a question, what if we wanted to have a string that tells

5
00:00:19,020 --> 00:00:23,070
me, let's say the weather and here we want to write?

6
00:00:25,060 --> 00:00:26,500
It's sunny.

7
00:00:28,990 --> 00:00:37,450
Hmm, you see how the highlighting change here, because I want to say it's with an apostrophe s but.

8
00:00:38,540 --> 00:00:43,400
Python is reading this and saying, OK, this is the start of the string and this is the end of the

9
00:00:43,400 --> 00:00:47,480
string, and then I have no idea what this is and then we're starting a string again.

10
00:00:48,550 --> 00:00:50,050
How can we fix this?

11
00:00:50,950 --> 00:00:59,860
Well, we can add a double quote string and said, and this now works, but what if for some reason

12
00:00:59,860 --> 00:01:02,200
we also wanted to add it's.

13
00:01:03,620 --> 00:01:07,100
Kind of sunny in quotation marks.

14
00:01:07,610 --> 00:01:11,870
Well, now we have another issue, so how can we solve this?

15
00:01:11,870 --> 00:01:17,120
Because in human language we have double quotes and apostrophes.

16
00:01:19,000 --> 00:01:21,400
Well, we can use escape sequences here.

17
00:01:23,000 --> 00:01:30,020
And this is a little hard to understand at first, but it's simply adding a slash like this.

18
00:01:31,020 --> 00:01:34,560
So the one right above your enter on the keyboard.

19
00:01:36,310 --> 00:01:43,000
So this slash, when Python goes through, it is going to say, all right, whatever comes after this,

20
00:01:43,030 --> 00:01:47,380
I recognize this symbol, whatever comes after this, I'm going to assume it's a string.

21
00:01:49,360 --> 00:01:57,190
So now if I do backslash here and then back here, it's going to say, Hey.

22
00:01:58,130 --> 00:02:02,360
Python, I'm letting you know whatever comes after this is a string, I'm letting you know, whatever

23
00:02:02,360 --> 00:02:08,630
comes after this is a string, and then I'm letting you know what comes after this is a string so that

24
00:02:08,690 --> 00:02:11,150
when we print the weather.

25
00:02:13,420 --> 00:02:16,750
Everything is printed nicely, awesome.

26
00:02:18,020 --> 00:02:25,670
Now, this escape sequence can be used in multiple ways, for example, if I want to have an actual

27
00:02:25,670 --> 00:02:29,690
backslash, well, I can go like this.

28
00:02:29,870 --> 00:02:35,090
And because it's saying whatever comes after this is a string, it's going to assume that this is a

29
00:02:35,090 --> 00:02:35,600
string now.

30
00:02:35,690 --> 00:02:42,470
So if I run this, you see that we get this backslash and there's a few other neat tricks they can do

31
00:02:42,470 --> 00:02:42,790
with it.

32
00:02:43,310 --> 00:02:48,350
For example, one of it is the backslash t.

33
00:02:50,050 --> 00:02:51,460
Hmm, what does that mean?

34
00:02:51,820 --> 00:02:53,980
Well, let's remove this for now.

35
00:02:54,460 --> 00:02:55,020
There you go.

36
00:02:56,600 --> 00:03:02,540
The back tee, remember Willis, outerspace in here so we can distinguish it, is going to say, hey,

37
00:03:03,050 --> 00:03:06,730
whatever comes after this, I want you to add a tab.

38
00:03:06,770 --> 00:03:08,350
This is a special meaning here.

39
00:03:08,900 --> 00:03:10,280
So if I click on Run.

40
00:03:11,370 --> 00:03:15,510
You see that it's added a tab spacing to my string.

41
00:03:16,910 --> 00:03:27,320
Another one is using GNH or a new line, so let's leave it here and then add a backslash and and then

42
00:03:27,320 --> 00:03:27,800
say.

43
00:03:29,250 --> 00:03:32,060
Hope you have a good day.

44
00:03:34,160 --> 00:03:36,530
What do you think will happen here if I click run?

45
00:03:38,390 --> 00:03:39,830
I have a tab.

46
00:03:41,000 --> 00:03:49,280
From the backlashed and then I have a new line after kind of sunny because I do the backslash and which

47
00:03:49,280 --> 00:03:53,310
denotes a new line so that this shows up on a new line.

48
00:03:54,140 --> 00:04:00,290
Now, these escape sequences are hard to see at first, but they're pretty much available in all programming

49
00:04:00,290 --> 00:04:00,760
languages.

50
00:04:00,770 --> 00:04:01,580
They use strings.

51
00:04:01,850 --> 00:04:05,780
So if you come from another language, this shouldn't be that strange to you.

52
00:04:06,020 --> 00:04:11,920
If it's your first time seeing this, you just need to get used to the syntax and every once in a while

53
00:04:12,050 --> 00:04:17,690
go to the python documentation and just type in escape sequences and you'll see all the ones that we

54
00:04:17,690 --> 00:04:18,070
have.

55
00:04:18,110 --> 00:04:20,180
These are the main ones that you need to know.

56
00:04:21,280 --> 00:04:21,710
All right.

57
00:04:21,850 --> 00:04:23,410
More to learn in the next video.