1 00:00:00,860 --> 00:00:01,140 Hello. 2 00:00:01,200 --> 00:00:02,220 Welcome back. 3 00:00:02,220 --> 00:00:08,100 So this was our last project where we saw how to deal with things like indentation and how to print 4 00:00:08,100 --> 00:00:09,820 a simple statement. 5 00:00:09,900 --> 00:00:12,780 And this lesson we should look at the variable types. 6 00:00:12,810 --> 00:00:18,090 What I'm going to do is I'm going to create a new project from this one by clicking the file and then 7 00:00:18,660 --> 00:00:26,700 I'll just click new over here and then I can come over here and say save all press controls and I'm 8 00:00:26,700 --> 00:00:29,340 going to call this number one on this call. 9 00:00:29,340 --> 00:00:33,090 Variables like this. 10 00:00:33,450 --> 00:00:41,200 And once that's done I can close this old one actually and I just explain this a bit. 11 00:00:41,520 --> 00:00:42,420 Right. 12 00:00:42,450 --> 00:00:43,740 So let's get started. 13 00:00:43,740 --> 00:00:50,220 So one other thing you should know about Python is it is completely object oriented and it's not statically 14 00:00:50,220 --> 00:00:50,820 typed. 15 00:00:51,010 --> 00:00:57,050 And what this means is we do not need to declare variables before using them or even declared the other 16 00:00:57,060 --> 00:00:57,880 types. 17 00:00:57,930 --> 00:01:03,600 We can just assigned anything to a variable and we don't need to declare what it's an integer overflow 18 00:01:03,600 --> 00:01:09,780 to string a character etc. every variable in Python is treated as an object. 19 00:01:09,840 --> 00:01:12,290 So let's see what I mean. 20 00:01:12,630 --> 00:01:19,380 And basically python like in most programming languages support two types of numbers the integer in 21 00:01:19,380 --> 00:01:20,110 the float. 22 00:01:20,880 --> 00:01:21,460 Let's see. 23 00:01:21,540 --> 00:01:25,140 So let's say we want to declare a number a normal integer number. 24 00:01:25,140 --> 00:01:26,410 There are ways of doing that. 25 00:01:26,490 --> 00:01:29,260 We could say num num. 26 00:01:29,380 --> 00:01:32,000 And of course 10. 27 00:01:32,420 --> 00:01:35,010 And this has got nothing to do with this. 28 00:01:35,130 --> 00:01:40,320 In any case doesn't tell python I want an integer I'm just saying this variable of course 10. 29 00:01:40,320 --> 00:01:47,820 I could have said X Y or boy of course 10 and it would be assigned to boy and we can print that to see 30 00:01:48,240 --> 00:01:51,350 print num end. 31 00:01:51,570 --> 00:01:58,510 Does the name of the variable to once that's done of press control is and then run from over here and 32 00:01:58,590 --> 00:02:00,690 I can see it's print at 10. 33 00:02:00,750 --> 00:02:10,940 Just like the for a float we can just declare it in the same way I can see num on the school float because 34 00:02:10,940 --> 00:02:19,700 something like eight point zero and then I can come down in print floats as well Naam on the score float 35 00:02:19,970 --> 00:02:29,510 like this control is click here and then run module you can see it's printed zero point eight as well. 36 00:02:29,510 --> 00:02:35,990 So another way we can define a float is to actually cast it to a float and let's see what I mean by 37 00:02:35,990 --> 00:02:45,690 cost to a float I can come here and see and num float to it cause float and over here or just passed 38 00:02:45,780 --> 00:02:52,500 an integer type such as nine and let's see what happens when I use the float function float nine and 39 00:02:52,560 --> 00:03:03,430 I'll print the variable name is let's just be consistent by putting an underscore here the verbal name 40 00:03:03,430 --> 00:03:04,640 is num float 2. 41 00:03:04,720 --> 00:03:06,350 So I just pass the variable name here. 42 00:03:06,350 --> 00:03:11,920 Now on this call float to oppress control as to save. 43 00:03:11,920 --> 00:03:20,330 Click here to run that's going to see it's printed numb flow to us nine point zero or do I passed nine 44 00:03:20,330 --> 00:03:20,560 there. 45 00:03:20,570 --> 00:03:24,520 So this another way of typecast in a an integer to a float. 46 00:03:24,530 --> 00:03:27,170 Very simple very straightforward. 47 00:03:27,500 --> 00:03:28,850 Right. 48 00:03:29,120 --> 00:03:33,470 We can also assign things like strings to integers without even declaring them. 49 00:03:33,470 --> 00:03:44,030 For instance I can say greeting of course Hello I can use a single quotation Hello like this and I can 50 00:03:44,030 --> 00:03:46,550 see print greeting 51 00:03:49,160 --> 00:03:56,900 and control as I run this experiment would actually be better run over here in the show so that we can 52 00:03:56,900 --> 00:03:58,320 just see the resort. 53 00:03:58,400 --> 00:04:01,670 But I want you to keep records of all the various lessons. 54 00:04:01,670 --> 00:04:06,890 That's why we've created a new file in storing it so that we can change and perhaps you may need to 55 00:04:06,890 --> 00:04:08,510 revise in the future. 56 00:04:08,510 --> 00:04:13,040 So anyway as you can see it's printed hello here using a single quotation mark. 57 00:04:13,040 --> 00:04:15,260 So I'm going to declare another string variable. 58 00:04:15,260 --> 00:04:19,100 I can see response because. 59 00:04:19,160 --> 00:04:24,410 This time we can use a double quotation and we can see high and we can come down here and say print 60 00:04:24,890 --> 00:04:32,530 into brackets response like this and then I press controls to save a click over here run module we have 61 00:04:32,540 --> 00:04:33,930 response high. 62 00:04:33,950 --> 00:04:42,070 So we've got options we can use this single quotation or the double quotation so let's see other things 63 00:04:42,070 --> 00:04:49,780 that we can do we with strings we can concatenate strings just by using a simple addition sine like 64 00:04:50,380 --> 00:04:55,880 great and plus response will give us Hello Hi let's make something sensible out of that. 65 00:04:56,080 --> 00:05:04,660 For instance less a variable greeting one cause less good let's say we want to say good afternoon and 66 00:05:04,660 --> 00:05:13,900 then creating 2 which is the second part of the greeting could be afternoon afternoon like this and 67 00:05:13,900 --> 00:05:15,930 we can see a complete greeting. 68 00:05:15,940 --> 00:05:24,850 These are all variables complete on the school greeting because we can see creates in one 69 00:05:27,850 --> 00:05:40,380 plus creates and two and we can come down here and see print and then over here complete greeting and 70 00:05:41,850 --> 00:05:48,450 let's see what we get for this as a type of over here her request an E so I press control as to save 71 00:05:48,500 --> 00:05:53,460 I click here run and then run module we have Hello hello. 72 00:05:53,470 --> 00:05:57,910 Afternoon because we forgot the one here. 73 00:05:58,000 --> 00:06:05,610 So it's use in this is that so I'll put a one here and then we'll have greeting one plus greeting to 74 00:06:05,640 --> 00:06:09,220 control less click over here click Run mode. 75 00:06:09,220 --> 00:06:20,590 Good afternoon says and we can add space between if we want Crete and one plus space and then plus greet 76 00:06:20,630 --> 00:06:23,590 into and it's going to be good space. 77 00:06:23,610 --> 00:06:31,480 Afternoon Oh good afternoon is one word and there's a typo in afternoon anyway you get a point right. 78 00:06:31,950 --> 00:06:34,920 So we can you know deal with strings like this. 79 00:06:34,920 --> 00:06:35,940 Right. 80 00:06:36,060 --> 00:06:40,050 So this will there's for this lesson and one thing I'll point out you don't need to know the entire 81 00:06:40,170 --> 00:06:45,620 basics of Python before doing real stuff like DSP machine learning and other things. 82 00:06:45,630 --> 00:06:51,030 No you just need to know how to understand a variable is manipulate them understand how to create things 83 00:06:51,030 --> 00:06:55,920 like loops and functions as soon as you are done with that you need to get off the basics and start 84 00:06:55,920 --> 00:07:00,900 doing something much more exciting and practical because that's the only way you're going to learn the 85 00:07:00,900 --> 00:07:04,880 language because the basics tend to get boring after some time. 86 00:07:05,190 --> 00:07:09,490 So this all there is for this lesson and you have any questions at all. 87 00:07:09,510 --> 00:07:14,820 Send me a message or leave in the questions area and if you're finding this course useful please take 88 00:07:14,820 --> 00:07:19,410 some time off to leave a review and of course I shall see you in the next lesson.