WEBVTT 00:00.170 --> 00:00.860 Hello guys. 00:00.860 --> 00:04.430 So we are going to continue the discussion with respect to Python programming language. 00:04.430 --> 00:10.340 Now in this first video we are going to probably discuss about syntax and semantics in Python. 00:10.340 --> 00:13.850 So I have given the video outline what all things we are going to cover over here. 00:13.850 --> 00:17.870 So first of all we are going to understand about single line comments and multi-line comments. 00:18.290 --> 00:22.520 Uh, along with this, we are going to understand what is the definition of syntax and semantics. 00:22.550 --> 00:25.670 And then we will see basic syntax rules in Python. 00:25.670 --> 00:31.430 Then we'll also be understanding about semantics in Python and what are the common syntax errors and 00:31.430 --> 00:32.600 how to avoid them. 00:32.630 --> 00:36.740 And we'll also be seeing a lot of practical code examples okay. 00:36.950 --> 00:39.530 Now first of all let's go ahead with the definition over here. 00:39.530 --> 00:46.130 So here you can clearly see that syntax refers to the set of rules that defines the combination of symbols 00:46.130 --> 00:50.240 that are considered to be correctly structured program in a language. 00:50.240 --> 00:55.010 In a simpler terms, syntax is about the correct arrangement of words and symbol in a code. 00:55.400 --> 00:59.090 Now understand when we are doing coding right? 00:59.120 --> 01:02.030 Uh, we usually face some kind of syntax error. 01:02.060 --> 01:04.100 Why it usually happens. 01:04.160 --> 01:08.840 It may be because let's say I have not assigned a variable and I've directly used it, you know, so 01:08.840 --> 01:10.310 I may get a syntax error. 01:10.340 --> 01:14.390 So that is the reason it is written over here, that it is a correct arrangement of words and symbols 01:14.390 --> 01:15.020 in a code. 01:15.050 --> 01:15.590 Right. 01:15.770 --> 01:20.150 Now, uh, this is a basic definition of syntax. 01:20.150 --> 01:24.470 I would also like to give you some more definition for semantics. 01:24.500 --> 01:25.070 Okay. 01:25.070 --> 01:27.230 So let's go ahead and write it over here. 01:27.230 --> 01:32.720 So here you can see semantics refers to the meaning or interpretation of the symbol character and commands 01:32.720 --> 01:33.500 in a language. 01:33.500 --> 01:36.500 It is about what the code is supposed to do when it runs. 01:36.620 --> 01:44.120 Syntax is how we are able to arrange the words so that we write a code, and semantics refers to the 01:44.120 --> 01:45.020 interpretation. 01:45.020 --> 01:52.010 So whatever code, we are specifically writing what it is supposed to do right when it runs, like when 01:52.010 --> 01:55.820 we are trying to run it, what it is supposed to do, it is more about the task that we are trying to 01:55.820 --> 01:56.540 do, right? 01:56.570 --> 01:58.910 And that is what semantics basically refer to. 01:59.060 --> 02:01.250 Now, this is a some kind of basic definition. 02:01.250 --> 02:07.620 I know you usually don't go through this, but I really wanted to explain you in a way that a basic 02:07.620 --> 02:12.690 anyone can actually be able to understand this who is also starting Python programming language? 02:12.720 --> 02:25.440 Okay, now let's go ahead and see some of the basic syntax in Basic syntax rules in Python. 02:25.470 --> 02:26.070 Okay. 02:26.670 --> 02:32.970 Now first first and the foremost important thing is about case sensitivity. 02:33.180 --> 02:33.390 Okay. 02:33.420 --> 02:35.760 So I'm going to write a comment over here. 02:35.820 --> 02:37.110 Case sensitivity. 02:37.140 --> 02:43.080 Now before I go ahead you will be able to see that whenever I use double hash in a code. 02:43.320 --> 02:44.940 See whenever we create a coding cell. 02:44.970 --> 02:45.510 Right. 02:45.510 --> 02:50.370 And if I want to write some kind of comments, a single line comment, I can basically use this double 02:50.400 --> 02:50.970 hash. 02:51.120 --> 02:56.070 So this double hash basically means that whenever I want to use a single line comment, I can just use 02:56.070 --> 02:58.500 this and I can write any kind of comments that I want. 02:58.530 --> 03:03.150 Like I have written over here, let's say that in this code cell I'm going to discuss about basic syntax 03:03.150 --> 03:04.140 rules in Python. 03:04.140 --> 03:06.930 So I have just written double over here okay. 03:07.200 --> 03:11.520 Let's say and there is also an option to use multi-line comments okay. 03:11.670 --> 03:12.900 Now multi-line comments. 03:12.900 --> 03:15.690 Let's say that I have created one test.py file over here. 03:15.840 --> 03:22.710 Now for multi-line comment let's say I'll write this is a multi-line comment or sorry, this double 03:22.770 --> 03:24.450 dash is a single line comment. 03:24.600 --> 03:28.590 And in case of multi-line comment I have to use triple quotes, right? 03:28.620 --> 03:29.640 Something like this. 03:29.640 --> 03:30.720 Triple quotes. 03:30.720 --> 03:37.230 So I will say welcome to the right to the Python course. 03:37.230 --> 03:40.650 So that basically means I'm using 2 to 3 lines and I'm writing this particular lines. 03:40.650 --> 03:40.830 Right. 03:40.860 --> 03:43.800 I'm, I'm, I'm giving some kind of comments over here. 03:43.950 --> 03:49.200 Now whenever I have comments which, which expands to multiple lines, I can definitely use this triple 03:49.200 --> 03:49.830 quotes. 03:49.860 --> 03:55.320 So these are the two ways of writing comments in Python programming language okay. 03:55.470 --> 04:03.600 The reason why I have used this test dot p, y and c again in Python, you can actually use ipynb file, 04:03.600 --> 04:07.030 which is the Jupyter notebook file, or.py file, which is a python file. 04:07.240 --> 04:11.320 Now this triple quotes usually does not work in Jupyter notebook. 04:11.320 --> 04:14.140 It only works in test.py file, right? 04:14.170 --> 04:19.810 Other than that, single line comments definitely work for both Jupyter notebook and the py file. 04:19.840 --> 04:21.160 Basically the Python file. 04:21.250 --> 04:26.410 So I hope you got an idea of understanding about single line comments and multi-line comments. 04:27.700 --> 04:31.000 Now let's go ahead and see some of the basic syntax in Python. 04:31.210 --> 04:36.010 So first point that I really want to talk about is case sensitivity. 04:36.250 --> 04:44.290 And to give you a good comment over here Python is case sensitive. 04:44.290 --> 04:47.950 So guys now let me go ahead and define a variable. 04:47.950 --> 04:50.200 Let's say this is a variable. 04:50.680 --> 04:52.060 And what exactly is a variable. 04:52.060 --> 04:53.260 Again I will give a definition. 04:53.260 --> 04:57.430 But let's consider that a variable is something that stores some information. 04:57.460 --> 04:58.000 Okay. 04:58.060 --> 05:01.480 Let's say in this particular variable I define my name. 05:01.480 --> 05:02.290 That is Chris. 05:02.320 --> 05:02.950 Okay. 05:03.010 --> 05:09.420 And let's say I again define a variable with capital n, and I write the same variable name that is 05:09.420 --> 05:10.080 name. 05:10.080 --> 05:13.230 And here let's say that I am just going to use another name. 05:13.230 --> 05:14.850 Let's say Nick okay. 05:15.630 --> 05:24.000 Now one thing that you really need to know, if I print this particular name and if I print the next 05:24.000 --> 05:27.030 name right over here. 05:27.030 --> 05:30.360 Both this name are different variables, right? 05:30.360 --> 05:34.740 It is not the same variable, even though even though the variable meaning is same. 05:34.740 --> 05:34.980 Right. 05:35.010 --> 05:35.670 Name name. 05:35.670 --> 05:36.180 Right. 05:36.180 --> 05:40.710 But I've told over here that Python is case sensitive, right? 05:40.740 --> 05:45.570 That basically means both these variable are different identifiers. 05:45.600 --> 05:46.230 Okay. 05:46.650 --> 05:51.660 So if I am going to execute this here, you can see the first name is displaying Krish and the second 05:51.660 --> 05:52.890 name is displaying Nick. 05:52.920 --> 05:53.580 Right. 05:53.580 --> 05:58.380 So that is the reason we say that hey Python is case sensitive right. 05:58.380 --> 05:59.880 Both this variable. 05:59.910 --> 06:00.420 Right. 06:00.420 --> 06:06.800 If we are writing we always need to make sure that, uh, you know, let's say that I have defined this 06:06.800 --> 06:07.460 name over here. 06:07.460 --> 06:13.460 And again, I have defined name, uh, unless and until both this, both this variable are having that 06:13.460 --> 06:14.570 case sensitive things. 06:14.600 --> 06:14.900 Right. 06:14.900 --> 06:20.270 That basically means if I, even though I'm writing with the small, uh, small n later letter over 06:20.270 --> 06:24.230 here, then I will be considering both this variable as same. 06:24.260 --> 06:26.900 Otherwise this will be treated as a different identifier. 06:26.930 --> 06:27.110 Right. 06:27.140 --> 06:29.840 So this is one of the very much important information. 06:29.840 --> 06:31.850 Now coming to the second thing right. 06:31.880 --> 06:35.660 Second point let's talk about something called as indentation. 06:36.140 --> 06:37.340 Right now. 06:37.340 --> 06:39.230 What exactly is indentation okay. 06:39.230 --> 06:41.660 And this is also very much important to understand. 06:42.620 --> 06:44.210 I'll just write a comment over here. 06:44.390 --> 06:48.290 Python uses indentation to define blocks of code. 06:48.440 --> 06:50.360 Consistent use of space. 06:50.510 --> 06:53.120 Commonly four spaces or a tab is required. 06:53.150 --> 06:56.000 Okay, now what exactly is indentation? 06:56.030 --> 06:56.540 Okay. 06:56.540 --> 07:02.330 And if you really want to have a definition for indentation okay. 07:02.540 --> 07:05.660 Uh, so we can also define indentation over here. 07:05.660 --> 07:08.470 So let me just go ahead and give you some kind of definition. 07:08.500 --> 07:08.680 Okay. 07:08.710 --> 07:10.390 I will be using a markdown cell. 07:10.390 --> 07:12.610 And let me just go ahead and write over here. 07:12.640 --> 07:13.090 Right. 07:13.090 --> 07:16.900 And let's go through this particular indentation definition. 07:18.700 --> 07:20.470 So let me just go ahead and execute. 07:20.470 --> 07:24.610 Indentation in Python is used to define the structure and hierarchy of the code. 07:24.640 --> 07:30.550 Unlike many other programming language that uses braces to delimit block of codes. 07:30.580 --> 07:30.940 Right. 07:30.970 --> 07:34.720 Python uses indentation to determine the grouping of statement. 07:34.750 --> 07:40.870 Okay, now indentation is something that is very much necessary whenever you are writing some clauses. 07:40.900 --> 07:44.020 Let's say if block or for loop or something else. 07:44.050 --> 07:44.590 Right. 07:44.590 --> 07:48.790 So let's say I'll give you an example over here, I will I will define a variable. 07:48.790 --> 07:50.740 Let's say age is equal to 32. 07:50.770 --> 07:53.260 And let me just go ahead and write one if condition. 07:53.260 --> 07:56.500 Don't worry if you don't know about if condition how do we write it? 07:56.530 --> 07:57.850 What is the syntax and all? 07:57.880 --> 08:04.330 I will explain this as we go ahead, but I just want to give you an idea about indentation. 08:04.330 --> 08:08.670 So let's say if I write if age is equal to greater than 30. 08:09.180 --> 08:14.460 Now, when I write, if age is greater than 30, and if I just use this colon now see what will happen 08:14.460 --> 08:20.580 if I press enter, it is going to start inside this particular block and automatically it did not start 08:20.580 --> 08:21.450 from here. 08:21.450 --> 08:23.220 Instead it started from here. 08:23.250 --> 08:23.850 Right? 08:23.850 --> 08:26.160 So it is what it is basically doing. 08:26.160 --> 08:28.500 It is using indentation, right? 08:28.530 --> 08:31.920 It is using consistent use of space commonly for or tab. 08:31.950 --> 08:32.520 Right. 08:32.520 --> 08:35.880 And here it is for a block of statement right. 08:35.910 --> 08:36.810 Block of code. 08:36.840 --> 08:37.440 Right. 08:37.530 --> 08:42.300 So here if I am going to write, let's say that I'm going to print 30 over here. 08:42.960 --> 08:46.800 And I'm just going to print the age right now what is basically happening over here? 08:46.800 --> 08:50.520 I have just used this uh, if block. 08:50.550 --> 08:51.120 Right. 08:51.180 --> 08:56.760 And because of indentation, we know that this code is only going to get executed when this is true. 08:56.820 --> 08:57.450 Okay. 08:57.480 --> 09:03.630 If I go ahead outside and if I print it print age, that basically means this is not inside the if clause, 09:03.660 --> 09:04.290 right? 09:04.320 --> 09:08.300 Usually in other programming languages we usually write this kind of braces. 09:08.300 --> 09:08.570 Right. 09:08.570 --> 09:10.610 We we try to define this kind of braces. 09:10.610 --> 09:14.360 If you know other programming languages like C plus plus or C sharp. 09:14.390 --> 09:14.840 Right. 09:14.840 --> 09:20.420 But in Python instead of using this braces automatically it will be aligned with indentation. 09:20.690 --> 09:23.300 Now let me just go ahead and execute it this time. 09:23.300 --> 09:27.650 Two times is basically getting displayed 32 so one is this and the other one is over here. 09:27.800 --> 09:33.020 Understand this age is basically getting displayed but this is outside the if block okay. 09:33.110 --> 09:39.710 So this is giving you an idea about indentation okay I have already explained you about comments, but 09:39.710 --> 09:42.290 let me just go ahead and write about single comments. 09:42.290 --> 09:43.670 So first single comment. 09:43.700 --> 09:45.740 Let's say this is a single line comment. 09:45.740 --> 09:49.040 I'll go ahead and write single line comment. 09:50.090 --> 09:54.740 Let's say that I'm going to print Hello World. 09:55.310 --> 09:59.630 Okay, now if I go ahead and execute this, you can see only Hello World is getting displayed. 09:59.630 --> 10:05.030 This this comment section is not getting printed right again, why do we write comments? 10:05.030 --> 10:06.500 Let's say that I want to define a function. 10:06.500 --> 10:08.980 I want to give some information about this particular function. 10:08.980 --> 10:11.350 I can write all those info in this comment section. 10:11.380 --> 10:14.410 Okay, now this is important. 10:14.440 --> 10:18.790 Okay, now let me just go ahead and talk more about different, different syntaxes. 10:18.790 --> 10:22.120 One more syntax is something called as line continuation. 10:22.810 --> 10:25.660 So here I'm going to basically write line continuation. 10:26.800 --> 10:28.780 Now what exactly is line continuation. 10:28.810 --> 10:33.940 Okay let's say I am going to create a variable total okay. 10:33.970 --> 10:42.400 And I'm doing some mathematical operation like one plus two plus three plus four plus five plus six 10:42.400 --> 10:43.570 plus seven. 10:43.570 --> 10:46.270 Let's say this line is becoming bigger and bigger, right? 10:46.480 --> 10:48.880 So this line is really becoming bigger and bigger. 10:48.880 --> 10:50.500 Let's say I want to go to the next line. 10:50.500 --> 10:55.720 So what I can actually do let's say I will write plus and now I will use a black slash. 10:55.750 --> 10:59.680 Now if I use a backslash and if I press enter then what is going to happen. 10:59.680 --> 11:01.690 It is just going to continue in the new line. 11:01.720 --> 11:02.230 Okay. 11:02.230 --> 11:06.670 So here I will just use this and then let me go ahead and press backslash. 11:06.670 --> 11:11.100 And let's say I go ahead and add more elements like four plus five plus six. 11:11.130 --> 11:17.460 Now if I go ahead and print total, you'll be able to see this will also do all the operations. 11:17.460 --> 11:30.180 So if I do the calculation 1318, 22, 25, 27, 28, 28 and 28, plus six, 34, 39, 43, right. 11:30.210 --> 11:35.970 And I'm able to get the answer so you can use right. 11:36.000 --> 11:41.790 In case of uh, basically line continuation, you can basically use a backslash. 11:41.820 --> 11:42.510 Right. 11:42.510 --> 11:45.780 And you can continue the statement to the next line. 11:45.810 --> 11:46.200 Okay. 11:46.230 --> 11:47.850 So this is very much important. 11:47.850 --> 11:49.860 Again one of the most amazing feature. 11:50.850 --> 11:53.310 And again let me just show you one more thing. 11:53.400 --> 11:56.070 One more amazing thing with respect to syntax and semantics. 11:56.070 --> 12:01.440 Uh, that is nothing but multiple statements on a single line. 12:03.600 --> 12:04.380 On a single line. 12:04.380 --> 12:05.820 Now, what does this basically mean? 12:05.820 --> 12:08.190 Let's say I want to assign one value. 12:08.190 --> 12:09.390 Let's say x is equal to five. 12:09.390 --> 12:11.780 I have defined I want to define another variable. 12:11.780 --> 12:13.280 Let's say y is equal to ten. 12:13.610 --> 12:17.030 Again if I want to define another variable I'll use the colon. 12:17.150 --> 12:19.760 And I'll go ahead and write x is equal to x plus y. 12:20.090 --> 12:25.340 Now what is basically happening in a single line of code in a single line I've used multiple statement. 12:25.370 --> 12:28.850 I've assigned x is equal to five, y is equal to ten, Z is equal to x plus y. 12:28.970 --> 12:35.120 Now if I go ahead and print z you see I will be able to get the answer. 12:35.150 --> 12:37.940 So ten plus five is equal to nothing but 15 right. 12:38.030 --> 12:42.920 So guys now here you can see that this kind of operation can also be performed right. 12:42.950 --> 12:47.000 Now let's go ahead and understand semantics okay. 12:47.570 --> 12:49.520 And here also I'm going to put some points. 12:49.520 --> 12:54.740 So understanding semantics in Python okay. 12:54.980 --> 12:59.480 Now the first thing that we are going to understand is about variable assignment. 12:59.540 --> 13:03.170 So what exactly is variable assignment. 13:03.950 --> 13:08.150 Let's say that I define a variable like age is equal to 32. 13:08.180 --> 13:08.810 Okay. 13:09.620 --> 13:13.450 So here when we run this particular command, right? 13:13.750 --> 13:19.180 When we run this line of code, then in other programming languages, you usually define the data type 13:19.180 --> 13:21.910 beforehand, like int age, float age. 13:21.940 --> 13:27.130 But here in Python the kernel automatically understands during the runtime. 13:27.130 --> 13:32.770 So here the kernel will understand that age is an integer, because here we are assigning some integer 13:32.770 --> 13:33.370 value. 13:33.760 --> 13:37.540 Similarly, let's say I go ahead and write name is equal to Chris. 13:38.290 --> 13:41.740 So here you will be able to see that name will be a string right. 13:41.770 --> 13:43.120 So name is a string. 13:43.270 --> 13:45.670 So I will just go ahead and execute this. 13:46.450 --> 13:51.310 If you want to understand whether I am probably how to probably check the type of this. 13:51.310 --> 13:53.440 So I will go ahead and write type of age. 13:53.470 --> 13:55.330 And let me just go ahead and execute it. 13:55.330 --> 13:58.480 So here you'll be able to see that hey I'm getting an integer value. 13:59.350 --> 14:01.720 So this basically indicates that age is an integer. 14:01.750 --> 14:05.350 Then if I go ahead and execute type of name. 14:05.350 --> 14:09.640 So here you'll be able to see that hey it is an STR type that is nothing but string type. 14:10.450 --> 14:13.350 Now uh, let me do one thing. 14:13.980 --> 14:14.580 Okay. 14:14.970 --> 14:19.590 Uh, this the type that we have actually run, right? 14:19.620 --> 14:23.250 It is also called as something called as type inferencing. 14:23.520 --> 14:26.340 So here I'm going to basically write type inference. 14:27.150 --> 14:32.280 Now Python infers the type of a variable at the runtime. 14:32.280 --> 14:35.490 And this is basically allowing dynamic typing. 14:35.520 --> 14:35.730 Okay. 14:35.760 --> 14:38.340 So what does it basically mean over here. 14:38.340 --> 14:43.530 Is that uh okay I will just use this in the other code. 14:43.530 --> 14:44.280 Let's see. 14:45.390 --> 14:48.240 So if I go ahead and write over here I'll create a variable. 14:48.300 --> 14:50.070 Variable is equal to ten. 14:50.100 --> 14:50.670 Okay. 14:50.970 --> 14:57.030 And let's say I go ahead and write print type of var right. 14:57.330 --> 14:59.550 As sorry this will be variable. 14:59.580 --> 15:00.120 Okay. 15:00.660 --> 15:02.520 Now what is basically going to happen over here. 15:02.520 --> 15:08.520 Once you probably execute this you are able to get an answer saying that hey it is of int type and the 15:08.520 --> 15:10.110 class will be int okay. 15:10.380 --> 15:17.480 But if I go ahead and use the same variable and assign some other name or some other value. 15:17.510 --> 15:18.500 Let's say Chris. 15:19.490 --> 15:26.330 Now if I go ahead and print the type of variable, now what I'm actually going to get right. 15:26.330 --> 15:31.520 So here you'll be able to see that I will be able to get str for the same variable itself. 15:31.550 --> 15:32.180 Right. 15:32.270 --> 15:38.660 So here you'll be able to see that whenever we refer to the type of this specific variable, we will 15:38.690 --> 15:41.060 be also able to see something very amazing. 15:41.060 --> 15:46.790 As we keep on changing this particular variable we will be also able to see the inferencing type right. 15:46.820 --> 15:50.690 So basically when we are searching for type of this it is basically showing different different things. 15:50.690 --> 15:55.670 So that basically means what during the runtime you can change the type of the variable with different 15:55.670 --> 15:57.380 different values okay. 15:58.250 --> 16:02.540 Now this was one of the most amazing thing with respect to semantics. 16:02.570 --> 16:03.170 Okay. 16:03.620 --> 16:09.860 Uh, and uh, as, as, you know, something, uh, over here is that we also need to understand that 16:09.890 --> 16:14.170 what happens, uh, in the case of indentation error, let's say if I go ahead and write, age is equal 16:14.170 --> 16:19.180 to 32, and if I write if age is greater than 30, okay. 16:19.210 --> 16:23.320 And if I go ahead and execute it and let's say I don't use this indentation. 16:23.320 --> 16:26.830 Instead I start from here and I go ahead and write print age. 16:26.860 --> 16:31.750 So here clearly you will be getting an error saying that hey indentation error expected and indented 16:31.750 --> 16:34.150 block after if statement on line two. 16:34.180 --> 16:36.220 So this is how you will be able to understand it. 16:36.250 --> 16:40.480 All I have to do is that start from this and automatically you'll be able to see the answer. 16:41.110 --> 16:41.650 Okay. 16:42.310 --> 16:44.440 Uh, this is important. 16:44.470 --> 16:46.180 Uh, otherwise, uh. 16:46.180 --> 16:46.810 Understand? 16:46.810 --> 16:48.880 Without indentation, things will not work out. 16:48.880 --> 16:53.770 Even though you create classes, even though you create functions, whenever you write a block of codes 16:53.770 --> 16:58.180 within some kind of blocks itself, like an if statement for loop or while loop. 16:58.180 --> 17:00.790 So indentation is specifically required there. 17:00.790 --> 17:03.790 You do not explicitly need to use brackets. 17:04.570 --> 17:09.730 Now, uh, one more thing, one more syntax error, which usually people do. 17:09.760 --> 17:13.150 Let's say I have defined a is equal to B and you know that B is not defined. 17:13.180 --> 17:18.090 So if I go ahead and execute this, this is also kind of syntax error because name B is not defined 17:18.090 --> 17:18.570 over here. 17:18.600 --> 17:18.750 Right. 17:18.780 --> 17:22.470 So this basically becomes a unknown variable right. 17:22.500 --> 17:28.260 So this is nothing but this is basically called as a name error okay. 17:28.350 --> 17:33.930 I'll be showing you as we go ahead uh with respect to exception handling and how do we handle all these 17:33.930 --> 17:34.440 things. 17:34.440 --> 17:35.850 We'll be talking more about it. 17:35.880 --> 17:36.390 Okay. 17:36.600 --> 17:38.490 Now let me do one thing. 17:38.520 --> 17:42.360 Let me just show you one amazing example of indentation. 17:42.360 --> 17:45.240 Some code example of indentations. 17:45.390 --> 17:46.050 Okay. 17:46.170 --> 17:52.440 And again, uh, after this session, also I will be giving you a lot of, uh, quizzes, assignments, 17:52.440 --> 17:54.480 practice sessions and all. 17:54.480 --> 17:56.550 You just need to go ahead and do it okay. 17:56.580 --> 17:57.390 Practice it. 17:57.390 --> 17:59.190 So here if I write if true. 17:59.220 --> 18:01.050 So true is a kind of a boolean variable. 18:01.050 --> 18:03.630 I will be talking more about variables in our next session. 18:03.690 --> 18:05.580 Let's say I go ahead and print. 18:06.360 --> 18:10.620 This is my correct indentation right indentation. 18:10.710 --> 18:14.040 So here uh this this basically becomes my statement. 18:14.040 --> 18:17.630 And print is just to print anything in your output console. 18:17.660 --> 18:18.200 Okay. 18:18.410 --> 18:21.320 Now inside this true, let's say I have another condition. 18:21.320 --> 18:22.700 If false. 18:22.970 --> 18:28.430 Now, if I want to write any print statement inside this block, then I have to again do an indentation. 18:28.430 --> 18:29.570 So here we go ahead and write. 18:29.600 --> 18:32.480 Print this one print. 18:32.510 --> 18:34.160 Write this one print. 18:34.160 --> 18:36.980 Why it will not print because by default it is true. 18:37.010 --> 18:38.480 This is going to print. 18:38.990 --> 18:42.560 It is going to check this condition and is going to come out of this particular condition. 18:42.560 --> 18:43.010 Right. 18:43.010 --> 18:48.380 And finally you'll be able to see that I'm printing one more thing over here saying that whether this 18:48.380 --> 18:52.490 will print or not, you just think, okay, this will obviously print, right? 18:52.490 --> 18:54.140 Because this is not getting executed. 18:54.140 --> 18:55.460 We are not going inside this. 18:55.460 --> 18:57.860 And finally, this print statement will execute. 18:57.890 --> 19:03.260 Now, if I want to go outside the if clause, then this will be another print statement. 19:03.290 --> 19:03.830 Right. 19:03.860 --> 19:08.540 And I can basically say outside the if block. 19:09.140 --> 19:14.540 So how many times print is going to just pause the video and understand how many times the print statement 19:14.540 --> 19:16.460 is going to execute it, right three times. 19:16.460 --> 19:17.900 So if I go ahead and execute it. 19:17.930 --> 19:19.670 You'll be able to see correct indentation. 19:19.670 --> 19:21.770 This will print outside the if block. 19:21.800 --> 19:22.280 Okay. 19:22.280 --> 19:24.950 So this is basically going to get printed right. 19:24.950 --> 19:28.640 So these are some of the amazing examples of indentation okay. 19:30.170 --> 19:32.030 Now let me do one thing. 19:32.030 --> 19:33.800 Let me show you one more thing. 19:33.830 --> 19:34.430 Right. 19:34.700 --> 19:40.520 Um one is with respect to correct variable assignment and uh, type inference. 19:40.520 --> 19:45.920 But before I go ahead and explain you more about this, this is some basics about syntax and semantics. 19:46.250 --> 19:50.300 Uh, now as we go ahead, what all things we basically covered single line comments, multi-line comments, 19:50.300 --> 19:53.210 definition syntax and semantics, basic syntax rules. 19:53.210 --> 19:55.070 How do you define a variable? 19:55.070 --> 19:59.810 What is case sensitive and all everything I've actually covered over here. 19:59.840 --> 20:00.050 Right. 20:00.080 --> 20:06.110 This actually gives you an idea about, uh, you know, the basic differences between syntax and semantics 20:06.110 --> 20:06.710 also. 20:06.740 --> 20:08.300 So I hope you like this particular video. 20:08.300 --> 20:13.520 In the next video I am going to talk about, uh, variables, then data types, then operators. 20:13.550 --> 20:14.030 Right. 20:14.030 --> 20:15.560 So yes, this was it from my side. 20:15.560 --> 20:17.000 I will see you in the next video. 20:17.000 --> 20:17.300 Thank you.