Original subtitles

0 So what is going on in this script? 1

Let me explain this one line by line. 2

Python executes the function definition but it doesn't do anything because it's just a function definition. 3

Python does things when it finds a function call such as this one in here. 4

So here we are calling the function and the input value for that function will be a Monday temperature 5

which is equivalent to this list. 6

So this list will go and be stored in this variable. 7

So value is equal to this list. 8

OK. 9

So what happens is that the interpreter will check if the type of that list is dict. If that is true, 10

it will execute this line here. 11

So it will assign the 12

outputs of this expression to the mean variable. 13

However this is not true in this case because type of the list is not a dict. 14

So python will not execute this line. 15

It will go to the next line. 16

So if that was not true then it will do this thing here. 17

So the men will be equal to the sum of the list divided by the length of the list which is 9.26 18

something. 19

So this is the current value of the mean. 20

Therefore here the indentation ends. 21

So return is outside of the if and else block you can see here, it has to be outside. 22

So the conditional block ends here and the current value of the mean will be returned by the return 23

statement. 24

So you get that mean value for 25

that list. 26

If this was student grades instead what happens is that this dictionary will be stored in value and 27

if type of value is dict. 28

Yes it's a dict. 29

The men will be equal to that. 30

So to the mean of the dictionary. 31

And if this condition is true this is executed and python will ignore everything that is under else. 32

I said everything that is under else which means everything that is indented under else. 33

So the children of else 34

So to say, return of the mean is not a child of else, it's not indented under else. 35

It's independents. 36

It has its own indentation level. 37

So therefore the current value of the mean is this one in here, so return to the mean will actually 38

return the mean for the dictionary, that one in there.