Original subtitles

0 This function returns the mean value of a list, but we want to make it more intelligence. 1

We want the function to return to the mean even if the input value is a dictionary. 2

So when the input value is a list it will going to apply a specific algorithm and return the specific 3

value which is the mean of a list. When it's a dictionary 4

it's going to check if it's a dictionary and apply the corresponding algorithm that calculates the mean 5

value of a dictionary. 6

So we know that 7

sum(monday_temperatures) divided by length of monday_temperatures gives you the mean of the list. 8

Similarly student grades which is a dictionary, it's values, the sum of its values divided by the length 9

of student grades dictionary will give you that mean. 10

So we want our function to check and make a decision. 11

This is a parameter. 12

Let me change it to value. 13

Value is a more meaningful name since what we are processing we will not only be a list but it can 14

also be a dictionary. 15

And then under the function everything has to be indented. 16

You can see the whole body of the function is indented. 17

So the conditional block that I'm going to write here is also going to be indented. 18

It starts with if. If you remember we used a type function earlier in the course which returned the type 19

of an object. 20

For example this is a dictionary, an empty one, but it's still a dictionary. 21

So what you can do here is you can say if type value. 22

Double assignment operator which means equal. 23

It's a comparison operator. 24

It checks equality. If that is a dict, a column, enter and it has to be indented with four spaces. 25

So you see it's another level of indentation it's one here for if, and this is for the function, so here 26

the mean will be equal to sum of value 27

dot values 28

divided by the length of value. 29

So this is a dictionary dict.values and length of the dictionary. 30

I have to close the sum function call there like that and enter. 31

If you are done with 32

the if block, 33

so if that's all what you want to check then you say else 34

and we have this code which has to be indented under else as well and that's it. 35

Let me try this. So with student grades, the dictionary as input 36

we got these value here. 37

If I used 38

the list 39

monday_temperatures it's going to give me the other value which is the meaning of the Monday temperatures. 40

So that's an if and else conditional. 41

But let me explain it line by line in the next video.