Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated:
0
1
00:00:00,430 --> 00:00:03,310
Now when it comes to naming your variables,
1
2
00:00:03,610 --> 00:00:06,580
you can pretty much call it whatever it is you want.
2
3
00:00:07,270 --> 00:00:09,010
So instead of calling this name,
3
4
00:00:09,370 --> 00:00:14,370
I could have just called it n and I could have called this l and as long as I'm
4
5
00:00:14,920 --> 00:00:15,790
consistent.
5
6
00:00:15,880 --> 00:00:20,880
So if I wanted to get the length of N then I would have to change this as well.
6
7
00:00:21,940 --> 00:00:25,960
And if I wanted to print out L then I have to change this as well.
7
8
00:00:26,590 --> 00:00:29,260
But there's a couple of rules that you should probably follow.
8
9
00:00:29,350 --> 00:00:34,350
And the most important one is to make your code readable. Because if you come
9
10
00:00:35,800 --> 00:00:38,830
back to this in six months, 12 months,
10
11
00:00:39,280 --> 00:00:42,730
N and L is not going to have a lot of meaning for you.
11
12
00:00:43,150 --> 00:00:46,450
So try to make sure that it actually makes sense to you.
12
13
00:00:47,590 --> 00:00:48,670
And if you want to,
13
14
00:00:48,670 --> 00:00:52,630
you can actually have multiple words in the name of your variable.
14
15
00:00:52,960 --> 00:00:55,900
So for example, if you wanted to call this username,
15
16
00:00:56,260 --> 00:01:00,610
then you would write the word user and then you would separate each of the words
16
17
00:01:00,820 --> 00:01:05,680
with an underscore. But you can't have a space in between.
17
18
00:01:05,710 --> 00:01:10,030
This is not valid code and if you try to run it, you'll get a syntax error.
18
19
00:01:10,840 --> 00:01:15,840
So the name of the variable has to be one single unit and in order to separate
19
20
00:01:16,810 --> 00:01:19,300
words in Python, we use the underscore.
20
21
00:01:20,080 --> 00:01:23,500
Now if you want to use numbers in the name of your variable,
21
22
00:01:23,500 --> 00:01:25,870
you can. So for example, length1,
22
23
00:01:25,870 --> 00:01:30,870
length2. But they can't be at the beginning of the name of the variables.
23
24
00:01:31,630 --> 00:01:35,200
You can't say 1length or 3length.
24
25
00:01:35,530 --> 00:01:39,850
That will generate a syntax error as well. Finally,
25
26
00:01:40,360 --> 00:01:43,720
there's certain privileged words that we use, for example,
26
27
00:01:43,720 --> 00:01:47,560
the names of our functions like print and input.
27
28
00:01:48,040 --> 00:01:53,040
And it's usually good practice to not use them as the names of your variables
28
29
00:01:53,530 --> 00:01:57,430
because you can see that syntax highlighting gets messed up because it thinks
29
30
00:01:57,670 --> 00:02:00,130
that is actually input function you're trying to create.
30
31
00:02:00,460 --> 00:02:04,330
And even though often when you run your app, it might not have any issues,
31
32
00:02:04,540 --> 00:02:07,600
this is really bad practice because it's very confusing.
32
33
00:02:08,680 --> 00:02:12,430
So try to make sure that all the names of your variables get highlighted,
33
34
00:02:12,670 --> 00:02:15,760
like the other variables in the same color. Now,
34
35
00:02:15,790 --> 00:02:20,170
the final thing to remember is that if you decide to call your variable this
35
36
00:02:20,170 --> 00:02:25,170
particular name, n-a-m-e, and at a later point you make a typo and you spell it
36
37
00:02:26,380 --> 00:02:31,090
wrong, so maybe instead of name you said nama,
37
38
00:02:31,780 --> 00:02:36,640
this is not going to work and when you run your code you'll get what's called a
38
39
00:02:36,670 --> 00:02:41,670
name error because it says this name is not defined. And the idea is that you
39
40
00:02:43,390 --> 00:02:48,390
would look at where the error is, line 2, print nama and you'll see,
40
41
00:02:49,090 --> 00:02:51,880
Oh that's not right. It's meant to be spelled n-a-
41
42
00:02:52,090 --> 00:02:57,090
m-e. So you'll have to go and fix it in order for your code to work.
42
43
00:02:58,000 --> 00:03:02,800
Now remember that this is not because Python is doing any sort of spell-checking
43
44
00:03:02,800 --> 00:03:06,730
for you. It's like, Oh, that's not how you spell name. No. In fact,
44
45
00:03:06,850 --> 00:03:11,850
if you decided to call this nama and you, later on, used it as name,
45
46
00:03:13,090 --> 00:03:16,000
there's no problems, there's no issues, no errors,.
46
47
00:03:16,690 --> 00:03:18,670
As long as it's consistent,
47
48
00:03:19,060 --> 00:03:23,830
this is the name that's associated with this piece of data. Later on,
48
49
00:03:23,830 --> 00:03:28,780
when you want to use this piece of data, you use this name to refer to it.
49
50
00:03:29,180 --> 00:03:32,290
And as long as these two spellings are identical,
50
51
00:03:32,500 --> 00:03:34,660
then the computer doesn't care at all.
51
52
00:03:35,230 --> 00:03:38,290
So when you get a name error in your code,
52
53
00:03:38,350 --> 00:03:43,350
you now know it's probably because you've misspelled or mistyped one of the
53
54
00:03:43,570 --> 00:03:47,950
variable names somewhere in your code. Now in the next lesson,
54
55
00:03:48,040 --> 00:03:52,510
I prepared a quiz for you where you'll get to select which variable names are
55
56
00:03:52,540 --> 00:03:55,390
valid and which ones are not good practice.
56
57
00:03:55,720 --> 00:03:58,060
Have a go at that over on the next lesson.
5770
Can't find what you're looking for?
Get subtitles in any language from opensubtitles.com, and translate them here.