WEBVTT 00:00.650 --> 00:02.200 Welcome back to our costs. 00:02.210 --> 00:07.130 So this session provides you with a quick overview over the data type tuple. 00:07.410 --> 00:14.080 So a tuple you can store many other objects and therefore tuple is also a sequence of many elements 00:14.090 --> 00:15.860 like for example a list. 00:16.370 --> 00:19.860 So to put this in some ways comparable to our list. 00:20.390 --> 00:27.290 However a tuple has much less functionality than a list and therefore we don't use it as often and as 00:27.290 --> 00:29.450 much as we we the list. 00:29.450 --> 00:35.330 But however there are many situations in Python programming where we we get in touch with tuples so 00:35.330 --> 00:40.730 we should at least know the basic functionality and the basics of tuples. 00:40.760 --> 00:41.140 All right. 00:41.150 --> 00:48.960 So let's start creating our first tuple by creating of our able a A equals and pattern to this one two 00:49.000 --> 00:49.380 three 00:52.150 --> 00:59.280 so a s a tuple containing three elements One two and three and we can also create a tuple without use. 00:59.290 --> 01:03.880 So if you just type B equals one two three is separated by Hamas. 01:03.940 --> 01:12.250 This also works and the same s with lists you can put the many different data types and many different 01:12.280 --> 01:13.650 elements into a tuple. 01:13.660 --> 01:20.620 So for example let's create a tuple C C equals 1 2.5 and talk. 01:20.620 --> 01:27.850 So we have feared integer we have a float and we have a string object so that's no problem it works 01:27.850 --> 01:36.330 like in the list and we can also index the tuple like in the list let's say if you want to get the second 01:36.390 --> 01:42.750 element of our tuple at an exposition one I would expect to get them to 01:45.500 --> 01:47.020 exactly. 01:47.300 --> 01:54.950 And also slicing works the same way as both lists if you want to slice tuple C from the second element. 01:54.950 --> 02:00.020 So beginning from index position 1 until the very last element. 02:00.080 --> 02:01.380 Then this also works. 02:01.520 --> 02:06.910 And also if we multiply a tuple with an integer eight times two. 02:07.040 --> 02:15.500 So we have the same behavior as the lists that actually we create copies of A and concatenate the copies 02:16.290 --> 02:21.860 so we don't have element y's multiplication as one one might expect actually. 02:21.870 --> 02:28.250 And also we can concatenate to 2:00 so we have total a and we f and number tuple with the elements for 02:28.260 --> 02:29.250 5 6. 02:29.410 --> 02:36.160 Then we can just concatenate it to a large Topo and the most important difference between a total and 02:36.160 --> 02:36.560 a list. 02:36.560 --> 02:41.350 This that the list is mutable so you can change elements of a list. 02:41.590 --> 02:50.150 And this is not possible with a total so if you want to change the first element of tuple a let's say 02:50.160 --> 02:58.160 change it to 100 then Python drops us an error message so tuple object does not some plot item assignment. 02:58.170 --> 03:03.650 So our total is immutable and this heavily restricts the functionality of tuples. 03:03.660 --> 03:07.120 So there are no not too much cases where we need tuples. 03:07.140 --> 03:12.890 However in python there are many functions that return multiple values. 03:12.910 --> 03:21.900 And so if a function returns multiple values it's in most cases it returns that via returning a tuple 03:21.900 --> 03:26.350 of these multiple elements so let's let's have an example here. 03:26.370 --> 03:30.040 So let's create the list with five elements. 03:30.120 --> 03:30.880 List El. 03:31.080 --> 03:34.820 And now we apply the function enumerate on Al. 03:34.860 --> 03:40.780 So what enumerate actually does the stocks index and value pass of list. 03:40.790 --> 03:43.110 L So actually it stops. 03:43.350 --> 03:51.540 So we have fear element one at an exposition from 0 and enumerate stores 0 1. 03:51.540 --> 03:53.820 So in exposition 0 now. 03:53.830 --> 04:04.110 So the element 1 then at an exposition 1 this element to enumerate creates and starts the index while 04:04.110 --> 04:07.250 you pass off a list. 04:07.260 --> 04:13.320 So and if I run now the enumerate function pacing does not return the index so well you pass. 04:13.320 --> 04:16.030 So it's only creating a so-called iterator. 04:16.050 --> 04:23.490 So what is an Iterator iterator we will learn later more about iterate us but to put it in easy words 04:23.880 --> 04:26.820 by running enumerate we are telling python. 04:27.210 --> 04:33.380 So please python and make yourself ready to give me the index value you pass at the time that I need 04:33.380 --> 04:33.850 it. 04:33.990 --> 04:40.200 So but now at this step it does not create and store the past it only creates the value you pass if 04:40.200 --> 04:44.760 I explicitly call it in another step and I can do it here. 04:44.760 --> 04:49.660 In this case by applying the list function on our iterator object. 04:49.680 --> 04:55.800 So now let's apply the list function on our enumerate object and assign the arrival n 04:58.690 --> 05:06.400 and now we get a list with the five elements and these elements tuples and these are tuples of indexed 05:06.400 --> 05:07.280 value pass. 05:07.300 --> 05:15.010 So we have that indexed position 0 the element 1 We are fed index position 1 The Element 2 and so on 05:15.120 --> 05:20.470 at the index position far the element 5 and this is one example of where we get in touch with tuples. 05:20.470 --> 05:26.140 So even if you if you don't want to get in touch with two bits there are many functions that return 05:26.140 --> 05:31.360 to both actually and then let's slice them the first tuple here. 05:31.750 --> 05:39.510 Let's say we take the first tuple at an exposition 0 and call it first tuple. 05:39.570 --> 05:47.610 So now we have one tuple of with the elements 0 and 1 and then what we can do we can unpack a tuple 05:47.820 --> 05:55.490 by saying Okay the first element I call index and the second element I will call a value so index comma 05:55.530 --> 06:03.540 value is equal to first tuple and now if you print index and value we get the unpacked three elements 06:03.540 --> 06:04.250 of the tuple. 06:04.260 --> 06:13.730 So index is 0 and values 1 in but we can also do we can let's call again our list l we can transform 06:13.730 --> 06:16.710 a list into a tuple so that's that's also possible. 06:17.670 --> 06:20.780 So now we have a tuple with five elements. 06:20.810 --> 06:21.150 All right. 06:21.150 --> 06:23.460 So this was a quick overview of our tuples. 06:23.460 --> 06:24.260 Hope you enjoyed it. 06:24.270 --> 06:28.110 And yeah we see us in the next session about sets.