1 00:00:01,680 --> 00:00:04,080 ‫Now let's move on to lists. 2 00:00:05,840 --> 00:00:12,860 ‫Lists are very similar to a string, except that each element can be of any type in the strings. 3 00:00:12,890 --> 00:00:19,820 ‫Each element was a character, but in lists, each element can be of any type. 4 00:00:20,890 --> 00:00:24,910 ‫So to define a list, we have to use square records. 5 00:00:24,940 --> 00:00:29,140 ‫So if I write l1l1 is our variable name. 6 00:00:29,410 --> 00:00:32,860 ‫Then in a square grid, if I write one, two, three, four. 7 00:00:37,460 --> 00:00:39,980 ‫One, two, three, four, five and one. 8 00:00:39,980 --> 00:00:42,590 ‫This one is our list. 9 00:00:43,670 --> 00:00:45,500 ‫To check right type. 10 00:00:49,210 --> 00:00:49,900 ‫And one. 11 00:00:52,490 --> 00:00:56,330 ‫It is showing that the type of one character is list. 12 00:00:57,350 --> 00:00:59,180 ‫To print all its value. 13 00:00:59,180 --> 00:01:01,130 ‫We write print one. 14 00:01:07,390 --> 00:01:10,510 ‫And we are getting all the values that one is containing. 15 00:01:13,300 --> 00:01:14,620 ‫Just like a strings. 16 00:01:14,620 --> 00:01:19,480 ‫We can also use the same slicing techniques to manipulate lists. 17 00:01:19,720 --> 00:01:21,310 ‫So if I write. 18 00:01:22,590 --> 00:01:25,200 ‫And one square record. 19 00:01:26,880 --> 00:01:27,480 ‫Zero. 20 00:01:29,840 --> 00:01:35,270 ‫This will give me element present at the zeroth location, which is one. 21 00:01:35,420 --> 00:01:41,660 ‫So here one is that location zero two is a location one. 22 00:01:42,050 --> 00:01:43,610 ‫Three is the location. 23 00:01:43,610 --> 00:01:46,640 ‫Two, four, three and five at four. 24 00:01:47,810 --> 00:01:48,860 ‫You just like a string. 25 00:01:48,860 --> 00:01:56,090 ‫I can use colon to select multiple elements, so if I write zero, Colon three. 26 00:01:58,280 --> 00:02:01,290 ‫It will give me the first three elements here. 27 00:02:01,310 --> 00:02:05,660 ‫The location three is excluded, so I will get elements presented. 28 00:02:05,660 --> 00:02:06,800 ‫Location zero. 29 00:02:07,010 --> 00:02:13,970 ‫Location one and location two three is excluded, just like slicing in the strings. 30 00:02:13,970 --> 00:02:15,950 ‫We can also use steps. 31 00:02:16,220 --> 00:02:18,230 ‫So if I write 11. 32 00:02:20,190 --> 00:02:24,060 ‫Now, if I want to select all the elements, I will just write Colon. 33 00:02:25,440 --> 00:02:27,120 ‫Then I will write another colon. 34 00:02:27,780 --> 00:02:32,040 ‫So first argument was for the starting location. 35 00:02:32,040 --> 00:02:35,340 ‫Second argument was for the stopping location. 36 00:02:35,340 --> 00:02:37,970 ‫And the third argument is for the steps. 37 00:02:37,980 --> 00:02:44,790 ‫We are not giving a starting and stopping location since we want all the elements and now we are defining 38 00:02:44,790 --> 00:02:45,940 ‫a step as two. 39 00:02:45,960 --> 00:02:49,590 ‫So it will give me all the alternate elements of my list. 40 00:02:51,630 --> 00:02:57,570 ‫So again, it is ignoring two and four since we provided a step of to. 41 00:03:01,650 --> 00:03:05,520 ‫It is not necessary for this to have all the elements of same type. 42 00:03:06,540 --> 00:03:10,260 ‫You can assign different types of elements in a single list. 43 00:03:10,260 --> 00:03:14,640 ‫So if I write, I'll do equal to the square record. 44 00:03:14,790 --> 00:03:16,710 ‫One comma. 45 00:03:17,630 --> 00:03:21,440 ‫If I want to write a string, I will write a double quotation. 46 00:03:21,740 --> 00:03:22,250 ‫A. 47 00:03:24,280 --> 00:03:24,720 ‫Coma. 48 00:03:24,730 --> 00:03:28,840 ‫If I want to provide floating point numbers, I will write 1.0. 49 00:03:30,740 --> 00:03:31,880 ‫And if I run this. 50 00:03:34,100 --> 00:03:40,150 ‫My two is created and the data type of my first element is and second element is a string. 51 00:03:40,160 --> 00:03:42,590 ‫And the third element is load. 52 00:03:43,730 --> 00:03:47,750 ‫But we can assign all this in a single list as well. 53 00:03:51,610 --> 00:03:55,620 ‫So if we want to check, we can check using the type operator. 54 00:03:55,660 --> 00:04:05,280 ‫If I type now inside a two, I want the data type of first element, so I will write zero and it is 55 00:04:05,280 --> 00:04:07,810 ‫the end because one is our end. 56 00:04:08,930 --> 00:04:10,110 ‫If I write type. 57 00:04:12,540 --> 00:04:15,120 ‫Redo the square bracket one. 58 00:04:17,370 --> 00:04:23,940 ‫Which is a string because our A is in double quotation and we have provided a string as a string we 59 00:04:23,970 --> 00:04:25,080 ‫write to. 60 00:04:26,780 --> 00:04:28,130 ‫Our two is a list. 61 00:04:28,130 --> 00:04:33,020 ‫That's why if we just write a type of L2, it will show us list. 62 00:04:35,490 --> 00:04:39,540 ‫We can also provide list as an element of another list. 63 00:04:39,780 --> 00:04:42,690 ‫So if we write l three equal to. 64 00:04:45,790 --> 00:04:46,480 ‫I do. 65 00:04:48,900 --> 00:04:49,590 ‫Coma. 66 00:04:50,640 --> 00:04:51,240 ‫One. 67 00:04:53,530 --> 00:04:55,390 ‫Coma, 2.0. 68 00:04:58,460 --> 00:05:00,020 ‫If we run this command. 69 00:05:00,050 --> 00:05:04,330 ‫So we have provided list a little list inside all three. 70 00:05:04,340 --> 00:05:05,960 ‫So if we print all three. 71 00:05:09,080 --> 00:05:09,560 ‫Here. 72 00:05:09,560 --> 00:05:18,140 ‫Our first element is a list, which is L2, and our second element is and third element is flawed. 73 00:05:18,710 --> 00:05:22,910 ‫So just to check if we write type of. 74 00:05:25,080 --> 00:05:25,890 ‫And three. 75 00:05:27,890 --> 00:05:28,700 ‫Common zero. 76 00:05:29,690 --> 00:05:34,190 ‫This is showing us as list because we have provided L2 inside of L3. 77 00:05:35,820 --> 00:05:36,420 ‫Now. 78 00:05:37,350 --> 00:05:40,710 ‫We have mentioned how to select the first element of all three. 79 00:05:40,830 --> 00:05:44,940 ‫We can just write all three and in record we can write zero. 80 00:05:45,760 --> 00:05:47,890 ‫This will give us the first element. 81 00:05:48,220 --> 00:05:50,530 ‫My first element is a list. 82 00:05:50,530 --> 00:05:53,710 ‫So how to select first element of that list. 83 00:05:53,890 --> 00:05:56,080 ‫We can write all three. 84 00:05:58,880 --> 00:05:59,850 ‫And square record. 85 00:05:59,870 --> 00:06:01,400 ‫I will first write zero. 86 00:06:02,400 --> 00:06:06,930 ‫Right now I am accessing my first element, which is a list. 87 00:06:07,200 --> 00:06:12,750 ‫Now, if I want the second element of this list, I will write in a square. 88 00:06:12,750 --> 00:06:13,830 ‫Record one. 89 00:06:14,860 --> 00:06:17,140 ‫If I run this command, it will give us. 90 00:06:18,040 --> 00:06:18,610 ‫Director. 91 00:06:18,610 --> 00:06:25,780 ‫A These types of lists are called nested lists because we have lists inside the list.