1 00:00:01,129 --> 00:00:08,510 Great! We have a working program now and we added every feature that we wanted. 2 00:00:08,510 --> 00:00:14,790 The only problem now with the program is that the output is not very 3 00:00:14,790 --> 00:00:23,250 user friendly. With that I mean you know let's say yes here, so this is the output 4 00:00:23,250 --> 00:00:29,490 and you get a list here, so it's a Python list and what we want to do 5 00:00:29,490 --> 00:00:35,309 instead is we want to show each of these lines in one separate line in the 6 00:00:35,309 --> 00:00:40,890 terminal, so that output will be more readable to the human eye. 7 00:00:40,890 --> 00:00:46,620 And let's go ahead and do that. So how can we implement such a thing? So this 8 00:00:46,620 --> 00:00:56,550 output now is a list object which means that the call here, the function call, this 9 00:00:56,550 --> 00:01:03,359 produces this list object and so what can we do is we could maybe iterate 10 00:01:03,359 --> 00:01:10,380 through this list object, you know something like we can store the list 11 00:01:10,380 --> 00:01:18,119 object in a variable. So output will be assigned this list. And then what you can 12 00:01:18,119 --> 00:01:26,180 do is you can say for item in the list, in the output list print out the item. 13 00:01:26,180 --> 00:01:33,600 Let's save this and try out. We're going to have an issue here, 14 00:01:33,600 --> 00:01:37,710 but one step at a time. Enter Y, yeas, Y. 15 00:01:37,710 --> 00:01:43,770 And so this is what I wanted to have so the first definition precipitation in 16 00:01:43,770 --> 00:01:49,350 the form of liquid water goes in the first line and the second definition to 17 00:01:49,350 --> 00:01:54,210 fall from the clouds in drops of water and goes to the second line. So that's 18 00:01:54,210 --> 00:02:00,540 good, however we should keep in mind that our program does not produce only lists, 19 00:02:00,540 --> 00:02:08,060 but sometimes it produces strings as well so such as this one in here. 20 00:02:08,060 --> 00:02:18,510 No, I didn't mean that. Anyway, so this is what you get and you don't want that. This is 21 00:02:18,510 --> 00:02:24,750 a message saying that the world doesn't exist. So what the program is doing, what 22 00:02:24,750 --> 00:02:30,330 Python is doing is it is iterating through all, every type of output that 23 00:02:30,330 --> 00:02:35,849 the function generates, so our function generates a list sometimes and sometimes 24 00:02:35,849 --> 00:02:41,549 it generates a string. How can we fix that? We have a list and 25 00:02:41,549 --> 00:02:44,640 a string. Let's think of the difference, how can we 26 00:02:44,640 --> 00:02:48,840 discriminate a list from a string? What's the difference between a list and a string? 27 00:02:48,840 --> 00:02:53,730 Well, the difference is clearly the data type. A list is a list object 28 00:02:53,730 --> 00:03:00,569 and a string is a string object. So how about implementing a conditional here? We 29 00:03:00,569 --> 00:03:19,109 say something like this. If type of output is a list, then indent this 30 00:03:19,109 --> 00:03:25,560 with four spaces and that one as well. So this loop now is nested inside that 31 00:03:25,560 --> 00:03:32,220 conditional and will be executed only when this evaluates to true so only when 32 00:03:32,220 --> 00:03:42,750 we have, when we get returned a list from the program so else it is not released 33 00:03:42,750 --> 00:03:48,859 it has to be a string so in the case we want to print out the output without 34 00:03:48,859 --> 00:03:54,170 iterating through it. So let me check! And we get the output correctly this 35 00:04:00,260 --> 00:04:04,609 time, the message: �The word doesn't exist. Please double-check it�. Let's check 36 00:04:04,609 --> 00:04:12,939 another time with a correct word. And we get the correct definitions in there. 37 00:04:12,939 --> 00:04:22,160 Let's try another world mathematics and this time the mathematics world has only 38 00:04:22,160 --> 00:04:29,479 one definition so we get that definition printed out in here so it's a science. Let's 39 00:04:29,479 --> 00:04:36,050 try the other scenario as well, rain. Did you mean rain instead? No. The word 40 00:04:36,050 --> 00:04:42,259 doesn't exist. Please double-check it. So we got this line here executed. So yeah, 41 00:04:42,259 --> 00:04:49,370 this is the complete code and I think we can consider our program complete now, so 42 00:04:49,370 --> 00:04:54,110 that's what I thought of adding to the program. Now the program is quite user 43 00:04:54,110 --> 00:04:58,910 friendly and we are considering many scenarios there that the user may input 44 00:04:58,910 --> 00:05:06,830 to the program. However the interface is still a command line interface, so it's 45 00:05:06,830 --> 00:05:13,580 not a desktop graphical program and it's not a web application. The interface is a 46 00:05:13,580 --> 00:05:17,930 command line, so you send input through the command line and you get output 47 00:05:17,930 --> 00:05:22,210 through the command line. And what I'm trying to tell you that you 48 00:05:22,210 --> 00:05:27,850 can actually extend this program so that you can transform it into a web 49 00:05:27,850 --> 00:05:31,720 application where the user instead of entering the input through the command 50 00:05:31,720 --> 00:05:37,479 line, that I can enter input through a web page, so through a live web site. 51 00:05:37,479 --> 00:05:43,599 They can enter input, push a button, and then get the output dynamically on the HTML 52 00:05:43,599 --> 00:05:49,030 web page so that is possible with Python, but you're still not ready to do that 53 00:05:49,030 --> 00:05:53,919 because we have quite a few more sections to go, we have some application 54 00:05:53,919 --> 00:06:00,250 well I've teach you how to develop web applications with Python. After that you 55 00:06:00,250 --> 00:06:07,449 can go back to this code and extend it and create a web interface and also 56 00:06:07,449 --> 00:06:11,680 you'll be able to create a desktop graphical user interface with the 57 00:06:11,680 --> 00:06:15,430 knowledge that you'll gain through these sections because we're also covering 58 00:06:15,430 --> 00:06:20,800 graphical user interfaces in the course and also we are also covering databases. 59 00:06:20,800 --> 00:06:25,930 So why I'm mentioning databases? Well, because in this program we're using this 60 00:06:25,930 --> 00:06:31,389 file where to store our data set. The problem with this is that if this gets 61 00:06:31,389 --> 00:06:36,130 too big, for now this is just five megabytes, so that's good but if 62 00:06:36,130 --> 00:06:40,810 the file gets too big, then you need to load the fall in Python every 63 00:06:40,810 --> 00:06:46,180 time you execute the script like here we are loading the file into the Python 64 00:06:46,180 --> 00:06:50,979 session when you execute the script. Now if the file is too big that will be very 65 00:06:50,979 --> 00:06:56,620 costly in terms of time, so what you want to do that you want instead, 66 00:06:56,620 --> 00:07:02,050 you want to use a database maybe. With a database what happens is that you make a query to 67 00:07:02,050 --> 00:07:07,810 the database and instead of getting the entire data set you actually get only 68 00:07:07,810 --> 00:07:13,900 that row or that value which you queried for, so databases are very efficient. 69 00:07:13,900 --> 00:07:18,610 I will cover databases later in the course and so after a few sections I'll get back to 70 00:07:18,610 --> 00:07:24,909 this program. I'll give it to you as an exercise so that you can extend it by 71 00:07:24,909 --> 00:07:29,380 creating and interface, a graphical interface for that, or a web 72 00:07:29,380 --> 00:07:33,510 interface and also I'll give you access to a database where 73 00:07:33,510 --> 00:07:38,610 you can query data for this program so that it becomes a real robust with a 74 00:07:38,610 --> 00:07:43,680 very friendly user interface. So I hope you like the idea and I hope you are 75 00:07:43,680 --> 00:07:49,770 enjoying the course and yeah let's move on with some more sections. 76 00:07:49,770 --> 00:07:51,000 I'll see you later! Bye!