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Hi everybody.

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Welcome back.

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In this video we will discuss object oriented programming.

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What will be the second interactive constructor method.

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A class can define missile with special name these names begin and end with a double under this code

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one in both and its natural name is underscore underscore and it underscore underscore its the for the

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class at school.

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Each time an instance of the class is created and implementing these missiles in a class gave us a chance

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to initialize each instance of our class we will use geometry notebook for coding a class of user that

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I have the init miss which is constructor and two parameters.

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Suppose it will be a name and age of the user.

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So we will initialize our variable age and the name as follows.

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Class

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C L A S S user data in camel case.

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So user the first letter U capital and that is the first letter is d capital a member enters its close

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parentheses column enters H equal zero and the name equal none

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then where it was and will use the z defined method to create the class buddy

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define def

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double underscore and it doubled under a school

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self

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name and H

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column enter self

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that name a quote name

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and self the H

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equal H.

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Finally we will use defined methods to call the class via its any census

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define

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define the same level of either indentation of a Z fairness to defined method

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use as

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self

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then we will type Brent for example user name sorry user with capital U user

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name

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is

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two curly brackets

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and there has

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to cut the brackets is

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all full stop.

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Then double quotes that for me.

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Self

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the name

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and self that age.

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We will add users to this class.

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User 1.

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Equal.

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As we explained in the last lecture users data

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Robyn.

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But entities close but entities Sara

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comma 40 and enter 5 different users as follows.

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Two will be for example davit

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and 50

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three will be for example

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John

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and 30

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user four will be gate

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and twenty

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user five.

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For example will be beta

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and 14 Zen shift and enter Zen we will check type of users.

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1 will be mean user data.

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This means that there is a part of a class called User that the same for the rest of users.

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Then we will check user to not its

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shift and enters.

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We will get 15

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users 3 that name we will get zone

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Suppose we want to calculate their users average age we will create a function will do that.

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Def AVC under school age

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of.

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But entities close parentheses column retarded.

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Use it one

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dot age for less

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user

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to dot age plus users 3.

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What age.

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The last user for that age plus users.

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5 that age

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sorry retarded

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to retain user 1 that age user to that age user 3 that age user forwarded to the age user 5 that age

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divided by 5 the number of users.

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Then we will call that function AVC

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underscore it.

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We will get seventy one so as average age of the users is 71.

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Also we can get more information from our class as follows.

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User 1 that user.

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The second function in our class.

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Click shift and enter.

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We will get user name is Sara and has 40 years old so can get any information from our class through

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its body and its tenses and defining methods.

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We will define an asset class called rectangle and throw it any senses.

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We will calculate the area of the rectangle throw the defined method.

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See a s s Rick can tango

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enter if double underscore in it.

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Now it underscores self

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length

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and why it's

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called on self that length

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equal length.

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Self-doubt lends equal lengths so we will be fair and instances too as the parameters of saying it misled.

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Also for the lights

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it was a rectangle

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then to find another missile.

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Yes.

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Rex area which is a buddy of Zachary glass rectangle.

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We will use to calculate the area of the rectangle self.

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The same instance of the class

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created

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self.

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Docklands

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multiply by self that wife.

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Then we will define our rectangles rect underscored one equal break.

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Tango class

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Rick

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rectangle

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rectangle class

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30 and 50

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rect 1 rectangle 1 equal rig.

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Tango class 50 and 30 then rectangle 2 equal rectangle

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140 and 60.

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Rick Stengel 3 equal rectangle.

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Class

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120 and 17 rectangle 4

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equal rectangle

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and 80 shift and enters and check for rectangle 1.

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That depth lends reacts Varia or whites.

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We will check for lengths collection and enter.

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We will get 50 rectangle 2.

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For example

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to dot tab check for whites.

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We will get 60 tangle underscores three rect underscores we got there.

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We will get uh three choices.

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We will choose rect area shift and enter

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boundaries of the rectangle.

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That area mean this because we don't edit the open and close parentheses of Z results.

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We will get 8 7 and 4 handle it.

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Then we will check for rectangle for

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diet

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type of minute.

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This is a rectangle 4 x 4 close parenthesis shift and enters an not rectangle.

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This means that rectangle 4 is a part of rectangle plus.

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Suppose we want to get the average area of all rectangles.

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We will type Brent of Amber entities req underscore one dot tap rect area but it is this close parenthesis

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to that act underscore fourth from rect underscored one to select underscores divided by the number

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of rectangles that we have in our class we will get six thousand five hundred seventy five.

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Thank you for watching.

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See you next lecture.