1 00:00:00,000 --> 00:00:04,990 Tuples and lists are very powerful in Python and there are a lot of operations 2 00:00:05,000 --> 00:00:06,990 that you can perform on them. 3 00:00:07,000 --> 00:00:10,990 Let's go ahead and set up a couple of tuples and lists. 4 00:00:11,000 --> 00:00:19,990 We'll have a tuple we'll call t and we'll initialize it with a range. 5 00:00:20,000 --> 00:00:24,990 So, there is our tuple and we can see type(t) is class tuple. 6 00:00:25,000 --> 00:00:30,990 So, I can check and I can say is there 10 in there. I can say 10 in t and I'll get it True. 7 00:00:31,000 --> 00:00:33,990 If I say 50 in t I get a false. 8 00:00:34,000 --> 00:00:40,990 Of course, you can also use not in. I can say 50 not in t and that will be True. 9 00:00:41,000 --> 00:00:44,990 I can look at a particular entry. I can say well what is that index 10. 10 00:00:45,000 --> 00:00:48,990 I can say t10 like that. 11 00:00:49,000 --> 00:00:52,990 I see because a range was 0 base that at position 10 is the number 10. 12 00:00:53,000 --> 00:00:59,990 Of course, I can look at the length of it and a tuple is iterable. 13 00:01:00,000 --> 00:01:06,990 I can say for i in t and I can print(i). 14 00:01:07,000 --> 00:01:15,990 Likewise, you can do all of these things with lists. x= list(range(20). 15 00:01:16,000 --> 00:01:17,990 I am missing a parenthesis there. 16 00:01:18,000 --> 00:01:23,990 So x is now that list and I can 10 in x and I can get true. 17 00:01:24,000 --> 00:01:30,990 I can 20 in x and will get false because that range was not inclusive and I can 18 00:01:31,000 --> 00:01:33,990 iterate it. I can say for i in x: 19 00:01:34,000 --> 00:01:37,990 print(i) and that's iterable as well. 20 00:01:38,000 --> 00:01:42,990 Of course, one of the major differences is that I can assign things to my list and 21 00:01:43,000 --> 00:01:44,990 cannot assign things to my tuple. 22 00:01:45,000 --> 00:01:46,990 My tuple is immutable. 23 00:01:47,000 --> 00:01:53,990 So I can't say t sub 10 = 25. 24 00:01:54,000 --> 00:01:55,990 tuple object does not support item assignment. 25 00:01:56,000 --> 00:01:57,990 A tuple is immutable. 26 00:01:58,000 --> 00:02:05,990 But I can say x sub 10 = 25 and when I look at x now I've got that 25 in the middle of it. 27 00:02:06,000 --> 00:02:11,990 Likewise, I can do any operation on a tuple that does not involve modifying it. 28 00:02:12,000 --> 00:02:17,990 I can use the count method to count how many 5s there are in the tuple and there 29 00:02:18,000 --> 00:02:19,990 is of course one of them. 30 00:02:20,000 --> 00:02:20,990 I can find the index of the 5. 31 00:02:21,000 --> 00:02:28,990 That will find that index of the first occurrence of that value and it's index number 5. 32 00:02:29,000 --> 00:02:36,990 If we look at t here we see 0, 1, 2, 4, 5. So that one there is indeed a 5. 33 00:02:37,000 --> 00:02:44,990 But I cannot append. If I say t.append(100), 'tuple' object has no 34 00:02:45,000 --> 00:02:46,990 attribute 'append'. 35 00:02:47,000 --> 00:02:50,990 On the other hand, if I look at my x object, which is a list, and I say 36 00:02:51,000 --> 00:02:56,990 x.append(100), it will put 100 at the end of it. 37 00:02:57,000 --> 00:03:00,990 The length of my x object is 21 instead of 20. 38 00:03:01,000 --> 00:03:04,990 I've actually extended it because I've added something to the end of it. 39 00:03:05,000 --> 00:03:15,990 If I want to add a number of things, I can't do that with append but I can do it with extend. 40 00:03:16,000 --> 00:03:19,990 This will allow me to extend it with any iterable object, so if I say 41 00:03:20,000 --> 00:03:26,990 (range(20)) now I'll get another 20 objects at the end of it. 42 00:03:27,000 --> 00:03:32,990 So, that range has been appended to the end using the extend method. 43 00:03:33,000 --> 00:03:38,990 If I want to insert something, I can say x.insert and I can insert at the 44 00:03:39,000 --> 00:03:45,990 beginning if I want to and I can put a 25 there and now we look at x. 45 00:03:46,000 --> 00:03:50,990 We've again extended the length of the array and there is a 25 at the beginning. 46 00:03:51,000 --> 00:03:52,990 But I can insert any place I want to. 47 00:03:53,000 --> 00:04:01,990 I can say x.insert(12, 100) and we'll see that I've got 100 there in the 48 00:04:02,000 --> 00:04:04,990 middle of the list. 49 00:04:05,000 --> 00:04:06,990 Likewise, I can remove it. 50 00:04:07,000 --> 00:04:12,990 x.remove(12) and that will remove the element with the value 12. 51 00:04:13,000 --> 00:04:17,990 It actually looks for the first value of 12 and removes that. 52 00:04:18,000 --> 00:04:27,990 If I want to delete the item at index 12 I use the delete operator and say x12 and 53 00:04:28,000 --> 00:04:31,990 that will delete that element at index 12. 54 00:04:32,000 --> 00:04:38,990 So, we see that 100 that we added in and we inserted at 12 is now gone. 55 00:04:39,000 --> 00:04:43,990 Finally, just like I can insert things at the beginning or at the end I can 56 00:04:44,000 --> 00:04:45,990 pop to remove things. 57 00:04:46,000 --> 00:04:53,990 If I just say x.pop, it will give me the value from the very end of the list and it removes it. 58 00:04:54,000 --> 00:05:00,990 So, you see that 19 is now gone. I got it returned from the pop method and now it's gone. 59 00:05:01,000 --> 00:05:07,990 If I want to, I can pop from the beginning I can say x.pop(0) and that will 60 00:05:08,000 --> 00:05:08,990 pop from the beginning. 61 00:05:09,000 --> 00:05:13,990 Now, I got that 25 from the beginning and the list is shorter by 1 and that's 62 00:05:14,000 --> 00:05:15,990 been removed from the list. 63 00:05:16,000 --> 00:05:20,990 Basically, we can do anything we want to with these lists, as long as we are 64 00:05:21,000 --> 00:05:22,990 using the mutable list object. 65 00:05:23,000 --> 00:05:28,990 So, all the power is there. You've got the equivalents of push and pop and insert and remove. 66 00:05:29,000 --> 00:05:33,990 You can remove things based on their value or based on their index, you can 67 00:05:34,000 --> 00:05:37,990 search for things, you can count the occurrence of things. 68 00:05:38,000 --> 00:05:41,990 All of this power is here for both the tuple and the list, as long as you are not 69 00:05:42,000 --> 00:05:45,990 using the things on the tuple that would modify it. Because you have to remember 70 00:05:46,000 --> 00:05:56,000 the tuple is immutable and the list is mutable.