1 00:00:00,730 --> 00:00:06,640 Hey, in this video, we will look at another wild loop example so that you understand the wild loop 2 00:00:06,640 --> 00:00:08,410 from another perspective. 3 00:00:09,880 --> 00:00:11,870 I'll show you two examples, actually. 4 00:00:11,890 --> 00:00:20,050 The first one is a very small program where we ask the user to enter a password and then we try to check 5 00:00:20,050 --> 00:00:22,420 if the password is correct. 6 00:00:22,450 --> 00:00:27,790 If it is correct, we tell the user that the password was correct. 7 00:00:28,060 --> 00:00:33,370 If it's not, we continue to ask the user to enter a password over and over again. 8 00:00:33,700 --> 00:00:36,610 This is how I would do it with a wild loop. 9 00:00:37,150 --> 00:00:39,010 So think about the user again. 10 00:00:39,010 --> 00:00:40,760 What do you want to show them first? 11 00:00:40,780 --> 00:00:50,080 Well, ask them to enter a password, so get the password from the user using an input function. 12 00:00:51,400 --> 00:00:52,750 Enter password. 13 00:00:54,190 --> 00:00:56,500 So that's the message we show to the user. 14 00:00:57,190 --> 00:01:03,610 The user will enter a password and the password that the user enters will be stored in this password 15 00:01:03,610 --> 00:01:04,269 variable. 16 00:01:04,510 --> 00:01:07,240 Then we check wild passwords. 17 00:01:08,500 --> 00:01:11,830 So while that variable value is. 18 00:01:13,190 --> 00:01:14,900 Not equal to. 19 00:01:16,930 --> 00:01:17,810 Pass. 20 00:01:17,830 --> 00:01:18,760 One, two, three. 21 00:01:18,970 --> 00:01:22,630 So let's suppose that the correct password is pass. 22 00:01:22,630 --> 00:01:23,560 One, two, three. 23 00:01:25,150 --> 00:01:26,940 And that's how we start the loop. 24 00:01:26,950 --> 00:01:29,950 So what is this expression here? 25 00:01:30,880 --> 00:01:32,230 And what is this? 26 00:01:33,430 --> 00:01:35,590 Let me show that to you in the Python console. 27 00:01:36,670 --> 00:01:48,790 You know, if you do pass 1 to 3 equal to pass 1 to 3, what you get is true If I execute this because 28 00:01:48,790 --> 00:01:57,910 this is an equal operator, so you get through the opposite of an equal operator is the not equal operator, 29 00:01:58,090 --> 00:02:03,220 which comes with this exclamation mark instead of two equal operators. 30 00:02:03,220 --> 00:02:05,800 So if I press that, I will get false. 31 00:02:06,900 --> 00:02:16,680 So what I'm saying here is that while the password is not this, then we keep asking the user for a 32 00:02:16,680 --> 00:02:17,220 password. 33 00:02:17,220 --> 00:02:20,610 So we execute that again over and over again. 34 00:02:20,760 --> 00:02:26,190 Otherwise, I will only indent now and go outside of the one loop. 35 00:02:26,910 --> 00:02:32,670 Otherwise we say password was correct. 36 00:02:33,510 --> 00:02:35,160 So let me execute this. 37 00:02:35,160 --> 00:02:36,900 Now enter password. 38 00:02:36,900 --> 00:02:38,910 Let's say pass one. 39 00:02:39,690 --> 00:02:40,800 Oh no. 40 00:02:40,830 --> 00:02:42,330 Pass two. 41 00:02:42,330 --> 00:02:43,610 No pass. 42 00:02:43,620 --> 00:02:44,640 One, two, three. 43 00:02:45,360 --> 00:02:47,670 Yes, password was correct. 44 00:02:49,260 --> 00:02:52,380 So to wrap it up, this is how this code works. 45 00:02:52,440 --> 00:02:55,960 This line here is executed only once. 46 00:02:55,980 --> 00:03:01,590 Everything that is outside a loop is executed only once in Python. 47 00:03:01,740 --> 00:03:07,950 But this expression here is inside the loop, so it will be executed as far as this condition stays 48 00:03:07,950 --> 00:03:08,520 true. 49 00:03:09,030 --> 00:03:12,780 And that condition is dependent on what the user enters here. 50 00:03:13,320 --> 00:03:21,360 So as soon as the password that the user enters is different from pass 1 to 3, we will get this executed 51 00:03:21,360 --> 00:03:22,410 over and over again. 52 00:03:22,890 --> 00:03:27,300 Otherwise, the loop ends and we show the user this message. 53 00:03:27,330 --> 00:03:29,130 That's how this code works. 54 00:03:30,060 --> 00:03:31,290 Another example now. 55 00:03:33,110 --> 00:03:35,090 I'll rename this to. 56 00:03:36,540 --> 00:03:40,320 Bonus to that one and create a new file. 57 00:03:43,000 --> 00:03:44,490 Bonus to the two. 58 00:03:46,150 --> 00:03:52,650 This time I want to use the World Loop to produce a series of numbers as output. 59 00:03:52,660 --> 00:03:57,460 So I want to produce numbers from one, two, three, four, five, six. 60 00:03:57,460 --> 00:04:01,480 So one, two, three, four, five, six will be printed out in the command line. 61 00:04:02,380 --> 00:04:04,390 How can we generate these numbers? 62 00:04:05,140 --> 00:04:09,010 Well, let me show you how using the one loop while. 63 00:04:09,640 --> 00:04:12,550 But we start with a value. 64 00:04:12,910 --> 00:04:15,700 Let's say x is one. 65 00:04:16,149 --> 00:04:17,320 X is a variable. 66 00:04:17,410 --> 00:04:18,910 One is a number. 67 00:04:19,750 --> 00:04:22,630 And we say while x is. 68 00:04:24,190 --> 00:04:26,080 Less or equal. 69 00:04:27,290 --> 00:04:28,310 Then six. 70 00:04:30,280 --> 00:04:31,570 We do something. 71 00:04:32,930 --> 00:04:35,810 And that here is also a comparison. 72 00:04:35,840 --> 00:04:41,000 Operator Just like we had that not equal. 73 00:04:41,000 --> 00:04:43,850 Operator We also had this equal operator. 74 00:04:44,390 --> 00:04:52,700 We also have the comparison Operators such as this one, for example, is one less than three we get 75 00:04:52,700 --> 00:04:56,930 through is one greater than three, we get false. 76 00:04:58,220 --> 00:04:59,420 Similarly, we have. 77 00:05:01,610 --> 00:05:04,010 Less or equal. 78 00:05:04,880 --> 00:05:08,780 So we get true because one is less than three. 79 00:05:09,200 --> 00:05:18,080 If you say it's one less or equal to three, sorry, equal to one, you get true because one is equal 80 00:05:18,080 --> 00:05:18,770 to one. 81 00:05:19,750 --> 00:05:20,530 And so on. 82 00:05:21,880 --> 00:05:23,290 So that's what we're checking here. 83 00:05:23,290 --> 00:05:27,790 If X is one, two, three, four, five or six. 84 00:05:28,540 --> 00:05:31,240 This will be evaluated to try to. 85 00:05:34,810 --> 00:05:38,200 So then I'll print out. 86 00:05:39,350 --> 00:05:39,980 X. 87 00:05:40,850 --> 00:05:46,850 But if I run the script now, what's going to happen is we're going to get one, one, one, one printed 88 00:05:46,850 --> 00:05:48,020 out all the time. 89 00:05:48,020 --> 00:05:49,910 So I have to stop the program now. 90 00:05:49,910 --> 00:05:53,930 Otherwise my processor will get quite busy. 91 00:05:54,930 --> 00:06:03,360 So we get one printed out because X here will always be less than six since its value is one. 92 00:06:03,360 --> 00:06:05,520 So there's no dynamics here. 93 00:06:05,640 --> 00:06:12,870 Nothing is changing x therefore we will get this line printed out all the time. 94 00:06:12,870 --> 00:06:22,440 But if we change x and say x is x plus one, then what we're doing is. 95 00:06:23,390 --> 00:06:25,400 We declare X here equal to one. 96 00:06:25,400 --> 00:06:30,610 We check if X is less or equal to six, which is true. 97 00:06:30,620 --> 00:06:33,290 So we get printed out one. 98 00:06:33,830 --> 00:06:42,290 So in the first iteration we will get one printed out, but then here X will be overwritten with this 99 00:06:42,290 --> 00:06:42,890 value. 100 00:06:42,890 --> 00:06:47,780 So currently x is one, therefore one plus one gives two. 101 00:06:47,780 --> 00:06:54,920 So the new value for x will be two and then the loop goes again. 102 00:06:54,920 --> 00:06:55,760 And here. 103 00:06:56,990 --> 00:07:01,120 X now is two, which is still less than six. 104 00:07:01,130 --> 00:07:11,810 So the loop will print out this again, it will update x, it will say x is equal to two plus one and 105 00:07:11,810 --> 00:07:13,820 that will make x three. 106 00:07:14,000 --> 00:07:17,380 The loop goes again, print three and so on. 107 00:07:17,390 --> 00:07:18,650 So let's run this. 108 00:07:20,300 --> 00:07:21,590 And that's the output. 109 00:07:21,860 --> 00:07:24,110 One, two, three, four, five, six. 110 00:07:24,890 --> 00:07:34,070 So that output was also my intention, and I hope this gives you some more understanding about the world 111 00:07:34,070 --> 00:07:34,700 loop. 112 00:07:35,360 --> 00:07:36,500 Thanks for following.