1 00:00:00,740 --> 00:00:07,950 So let's start by creating a function that turns these kind of strings into this form. 2 00:00:08,090 --> 00:00:08,810 Define. 3 00:00:11,450 --> 00:00:17,350 Let's call this sentence_maker() so it makes the sentences out of raw strings. 4 00:00:17,480 --> 00:00:19,270 Let's call these strings phrases. 5 00:00:19,300 --> 00:00:20,800 OK phrase. 6 00:00:20,870 --> 00:00:22,300 So it gets a phrase. 7 00:00:22,350 --> 00:00:25,950 And first you want to capitalize that phrase. 8 00:00:25,960 --> 00:00:26,300 Right. 9 00:00:27,980 --> 00:00:32,290 So maybe create a valuable insight that function called it's capitalized. 10 00:00:32,480 --> 00:00:40,210 Or wherever you like and say phrase and use the capitalized method 11 00:00:40,310 --> 00:00:50,210 of strings and in the meantime you can use your Python interactive shell to try out methods to see how they 12 00:00:50,210 --> 00:00:55,260 work while you at the same time create a function in your editor. 13 00:00:55,790 --> 00:01:07,730 So for example let's say I want to capitalize this string. First I'd like to try out how the capitalized method 14 00:01:07,730 --> 00:01:08,830 works. 15 00:01:08,870 --> 00:01:14,460 So now I'm sure that it's capitalizes a first letter so that's fine. 16 00:01:14,580 --> 00:01:22,670 Now we want to add to concatenate a period or a question mark to these phrases. 17 00:01:22,670 --> 00:01:22,990 Right. 18 00:01:23,600 --> 00:01:25,300 But that depends. 19 00:01:25,320 --> 00:01:31,760 And so we are talking about a condition here, the program has to make a decision whether to put a period 20 00:01:31,850 --> 00:01:40,680 or a question mark at the end of the phrase so let's go ahead and build a condition. If phrase... 21 00:01:40,780 --> 00:01:45,120 So how can we differentiate between questions and simple sentences 22 00:01:45,160 --> 00:01:49,060 that end with a period. Well, there may be different ways there. 23 00:01:49,180 --> 00:01:53,770 So that depends on the programmer and how sophisticated you want to do that. 24 00:01:53,800 --> 00:02:01,240 But let's keep it simple and let's say that questions are all those that start with an interrogative 25 00:02:01,450 --> 00:02:04,270 words such as how why and what. 26 00:02:04,390 --> 00:02:10,390 And you can check that with let's say you have a sentence like "how are you". 27 00:02:10,390 --> 00:02:20,870 Again. You can use the starts with method which gets a tuple as input. 28 00:02:20,870 --> 00:02:25,070 So a tuple, and inside that tuple you can have 29 00:02:28,250 --> 00:02:35,910 some strings that you're checking if this sentence starts with any of the strings inside this tuple. 30 00:02:35,930 --> 00:02:40,200 So let's say how, what, and why. 31 00:02:42,320 --> 00:02:45,110 So that will return true. 32 00:02:45,110 --> 00:02:49,780 Because how are you starts with one of these strings. 33 00:02:50,180 --> 00:03:00,500 In another scenario like "it's a good whether", you'll get false, so we can make use of that and say if phrase 34 00:03:01,040 --> 00:03:02,870 starts with 35 00:03:09,060 --> 00:03:14,180 how, what, and why. 36 00:03:14,910 --> 00:03:22,650 You can do that or even better would be to get this tuple and save it in a variable. 37 00:03:26,470 --> 00:03:27,640 Let's say interrogatives. 38 00:03:27,910 --> 00:03:28,870 And put it there. 39 00:03:28,870 --> 00:03:34,790 So then here you just put the variable and that will make the code more readable. 40 00:03:35,020 --> 00:03:43,700 So if the phrase starts with interrogatives, what we want to do in this case is to construct a string 41 00:03:45,010 --> 00:03:50,780 so let's say you return, the function will return this string. 42 00:03:50,920 --> 00:03:52,210 So that is 43 00:03:56,780 --> 00:04:05,630 capitalized, so capitalized will be capitalized version of the phrase that the user enters. 44 00:04:05,810 --> 00:04:13,580 And then we want to add to that a question mark just like that. 45 00:04:13,710 --> 00:04:17,850 So that will be replaced by capitalized by that string. 46 00:04:18,000 --> 00:04:20,220 And that will add a question mark to that. 47 00:04:20,220 --> 00:04:27,940 So that will happen if the phrase starts with any of the interrogative else return, 48 00:04:28,080 --> 00:04:34,540 in this case we will return a sentence with a dot, with a period. 49 00:04:35,340 --> 00:04:38,400 Again capitalized is what we put here. 50 00:04:39,600 --> 00:04:43,230 Let me demonstrate so far what we have. 51 00:04:43,440 --> 00:04:44,700 Sentence maker. 52 00:04:44,910 --> 00:04:50,220 So we want to execute the function, right? With a word, with a phrase. 53 00:04:50,220 --> 00:04:51,090 "How are you"? 54 00:04:53,980 --> 00:04:55,460 Save. 55 00:04:56,070 --> 00:04:57,030 Execute. 56 00:04:57,080 --> 00:04:59,930 And so we get the sentence correctly. 57 00:04:59,940 --> 00:05:00,520 How are you? 58 00:05:01,580 --> 00:05:02,370 That's it. 59 00:05:02,370 --> 00:05:06,270 Now we have a function that does something and does it good. 60 00:05:06,630 --> 00:05:10,410 Let's now think about the other aspects of the program in the next video.