WEBVTT 00:00.570 --> 00:06.090 In this section, you will learn about the different kinds of data you can work with in your Python 00:06.090 --> 00:06.770 programs. 00:06.780 --> 00:11.100 You will also learn how to use variables to represent data in your programs. 00:11.100 --> 00:13.410 So here we will. 00:15.320 --> 00:18.150 Write a simple code here, which is Hello world. 00:18.310 --> 00:19.010 Print. 00:19.900 --> 00:23.140 Hello, Oxley World. 00:23.620 --> 00:31.570 And here, let's take a closer look at what Python does when you run this script. 00:31.810 --> 00:37.990 As it turns out, Python does a fair amount of work even within the runs a simple program. 00:37.990 --> 00:41.770 So when you run this code, you should see this output. 00:41.770 --> 00:51.100 So when you run the our main.py file, the ending page here indicates that the file is a python program 00:51.100 --> 00:57.880 and your editor runs the file through the python interpreter which reads through the program and determines 00:57.880 --> 01:01.570 that what each word in the program means. 01:01.570 --> 01:10.180 For example, when the interpreter sees the word print here, when the interpreter sees the word print, 01:10.360 --> 01:12.280 followed by parentheses here. 01:13.250 --> 01:18.470 It prints to the screen whatever is inside the parentheses here. 01:19.980 --> 01:25.770 As you write your programs, your editor highlights different parts of your program in different ways. 01:25.800 --> 01:33.990 For example, it recognizes the print is the name of a function like this here and displays the word 01:33.990 --> 01:36.150 in one color. 01:36.180 --> 01:42.660 It recognizes that Hello world is not a python code here. 01:45.080 --> 01:49.370 And this place that fairs in different color. 01:49.820 --> 01:52.370 As you can see, it's green, it's purple here. 01:52.370 --> 01:59.510 So the feature is called syntax highlighting, and it's quite useful as you start to write your own 01:59.510 --> 02:00.500 programs. 02:03.410 --> 02:04.970 So let's get started with variables. 02:04.970 --> 02:10.790 So let's try using a variable in our main file and let's add a new line here. 02:10.790 --> 02:13.790 So we will message and here. 02:14.120 --> 02:17.630 Hello world. 02:19.090 --> 02:19.570 Here. 02:19.810 --> 02:23.500 And after that we will use print again. 02:23.530 --> 02:24.280 Print? 02:24.310 --> 02:25.750 Maybe if I raise them. 02:29.140 --> 02:30.010 Font size a little bit. 02:30.010 --> 02:32.350 So you can see better here. 02:32.830 --> 02:33.760 25. 02:35.050 --> 02:36.250 Okay, Nice. 02:36.580 --> 02:39.490 So now we're going to use print message. 02:40.470 --> 02:44.810 So now let's run this program again and see what's happening here. 02:44.820 --> 02:47.310 As you can see here, Hello world again. 02:47.700 --> 02:51.270 So we have added a variable name. 02:52.860 --> 02:58.140 And name the message, and every variable is connected to a value. 02:59.710 --> 03:03.580 Which is the information associated with that variable. 03:04.410 --> 03:07.860 In this case, the value is Hello World. 03:08.540 --> 03:09.500 This is the text. 03:10.210 --> 03:17.650 And adding a variable makes it a little more work for Python interpreter and when it processes the first 03:17.650 --> 03:25.420 line, it associates the variable message with the Hello World text. 03:25.420 --> 03:32.140 And when it reaches the second line, it prints the value associated with the message to the screen. 03:33.870 --> 03:39.910 Now let's expand on this program by modifying this file to print a second message. 03:39.930 --> 03:47.790 Here we will add a blank line to here and then we will add two new lines to the code. 03:48.210 --> 03:51.990 Now, message and here, Oxley. 03:53.180 --> 03:54.080 Python. 03:54.900 --> 03:55.710 Training. 03:56.440 --> 03:58.360 And or course. 03:58.360 --> 03:58.990 Right. 03:59.770 --> 04:03.250 And here after that, we will also print this message. 04:03.250 --> 04:06.280 So remember, these are the same variable names here. 04:06.670 --> 04:12.700 So now when you run this code, you will see this message. 04:13.660 --> 04:20.920 But you can change the value of variable in your program at any time, and Python will always keep track 04:20.920 --> 04:23.260 of its current value.