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Hi, everybody, I'm very happy that you're here with me.

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We will try to resolve and get the answers of inheritance homework assignment.

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I guess it was a bit challenging than previous assignments you can compare it to may be assignments

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or variables or collections.

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So obviously these assignments now are much harder and much more challenging, but there are surely

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doable because we went over all the topics in the previous lectures.

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OK, so quick overview of what do we need to do?

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We need to create two classes.

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One of them is the parent employee.

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The other one is the programmer, which is the child.

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We need to make inheritance between child and parent.

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And we also need to create some calculations, methods and also to bring some values.

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So once you open by charm, create a new file of OAP inheritance practice and let's begin.

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So first of all, let's create employee class.

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Yeah, and in here, we're going to create a death unit method, which is the constructor, and we're

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going to pass variables, years of experience and we have position.

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Name, yeah.

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Name of employee, yeah, this is what we were asked to pass.

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I have a small error here, a typo.

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Yeah, this is what we were asked to pass, and that's also to create the properties with the self keyword,

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as we already familiar with.

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OK, just going to copy paste it to save some time.

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I advise you to do the same.

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OK, if you can save some time with copy paste, it's always good.

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OK, ok, so these are the three variables that are going to be passed from the instances that we're

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going to create in a few minutes.

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So I'm creating them pre passing them already for the parent class right here and now for the class.

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I'm just going to add basically my my strategy is to create an overall structure for the assignment,

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which means create the methods, leave them empty, then create an instance, and then starting to build

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up the content of the methods at the end, because it's the most hard part to create all the calculations

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and all of that.

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So I'm just going to create the overall structure of the assignment.

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OK, so we have in the parent calculate salary.

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Yeah.

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And we're going to leave a best argument here in order to avoid errors.

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And then we have a deaf candidate for bonus up.

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Also a typo.

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Yeah, like that.

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Bass, here we are finished now, let's create a class child class programer,

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and it will inherit employees methods and properties like that, and in here we need to create death

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in it.

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Yeah, and here also going to create years of experience.

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Also going to save some time.

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Just copy all of them.

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I'm not sure we're going to use all of them, but you can always delete them later on, right.

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And in here, also self.

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This is the first one sorry, my mistake.

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Second one is position name.

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Yeah, we're starting from the left to the right, as always, self and then name of employee.

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Yeah, we're done.

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OK, and now we're seeing a small we encountered a small issue here.

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I'm always aware of what's happening on the page.

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I'm here.

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You can see here the Brownlee's, your background that we already seen from the previous videos.

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We see some kind of resolution here with the lamp.

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Mistretta click it and you can see ad superclass call.

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So basically Patra tells us that we need to pass these variables, these properties actually from here

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into the parent.

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So I'm just going to click it bang and you can see it created automatically the super init line for

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me in order to pass all the variables from here to the parent.

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OK, so this is we can do it automatically or either to write it manually.

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It doesn't matter.

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It's the same same effect.

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OK, and also in the class programmer, we were asked to create a def print data method like that.

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Have indention problem here.

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Let's go backwards.

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Yeah.

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And here self.

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Yeah.

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Also pass.

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And now outside of these two classes, let's create instances of an object.

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We have junior python programmer

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and it will get the program which is the child obviously.

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OK, the child you can see also it's marked with the same background and it will get one year of experience.

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The name would be front end with an underscore.

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And the name is Joseph.

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Yeah.

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First instance.

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And we also have seen dev ops instance and also programer class, and we have here six years senior.

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Dev ops, yeah, and the name is Dan, right?

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So these are our two instances that we are needed to create and now let's start with the baby from the

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beginning and start building up these methods.

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All right.

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OK, so first of all, we need to create a base salary, right?

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This is the variable base salary, it was mentioned in the assignment and then calculated salary, which

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at the moment you can either put your zero or you can use the keyword none, which means it's nothing.

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Yeah.

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And then let's try let's now build up the if statements that we were asked to use.

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OK, so first one was using the self years of experience and setting it up to be larger than zero but

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smaller than two.

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But we'll try to make it one one statement instead of doing like years of experience, bigger than zero,

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and then using the end argument and then making it self use of experience, smaller or smaller than

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two.

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OK, so instead of using these two arguments with an end parameter, we'll try to make it one parameter

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to be more efficient like this.

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OK, yeah, so we can make it like this, yeah, so you can see here sell off years of experience,

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either bigger than zero or smaller than two or equals.

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To do so, we can make it at once.

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We can also make, for example.

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Like this, yeah, but it's much longer it's less efficient.

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OK, so you see it's longer than the one in line 12.

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So I'm going to use this one.

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Yeah.

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And here we going to set up a calculated salary equals to base salary plus one thousand five hundred,

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because the people that have between zero and two years of experience are going to have increase of

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one thousand five hundred in their income, in their calculated salary right now if.

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Yeah, just going to copy the statement and place here, the number two, yeah, and here at the place,

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the number five and this statement said that base salary will be increased by two thousand five hundred.

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And also we had Ayliffe self years of experience, bigger than five.

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Yeah.

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And then the calculated salary would be increased by three thousand five hundred.

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OK, and then we going to use the default exit point the else, OK, because we can get instead of number

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here from the instance.

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Yeah.

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From here we can get may be true.

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OK, like boolean variable by mistake.

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We can get it through here and then if the true gets up to here, so we're going to have some kind of

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error here because if we put else.

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And put some calculation here, so it's not it's not true.

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Yeah, because we did not get any any true any like correct variable inside the method, we get a false

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variable.

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We got a wrong variable.

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So we're not going to do some calculations if we got a wrong variable.

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Yeah.

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So the thing is, we're using this else as an exit point in order to state that wrong value inserted.

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Yeah.

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If we got years of experience, either neither of these numbers zero to two, two to five or larger

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than five, if we got like a true or false value or we had a string.

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So it's a wrong value inserted.

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OK, so we need to print it out.

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We need to state it right.

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All right, and now we're going also outside of the if statement, you can see that like now I'm inside

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the if else, but if I'm going back to here, I'm outside.

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If and here I'm going to bring the calculated salary is going to string formating percentage calculate

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that salary.

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And the reason I'm not using the self because it's not a property, just a simple variable created inside

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the method.

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So I don't need to self.

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OK, it's not something that I've received from here.

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Just created it locally inside the inside the method.

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So I don't need self here.

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And if you recall, we were asked to calculate the bonus using this number.

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OK, so this number needs to go from this method.

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Into this method.

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So in this method, we need to receive the calculated salary, we can give it any name.

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OK, I can give it the calculated salary just to make some difference, to show you that it's not have

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to be the same.

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But the name, OK, I mean, the name does not have to be the same.

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Yeah.

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And inside here, the candidates for bonus, we had several conditions.

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So first of all, salary with bonus would be first of all, none.

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And then we had if and just want to stop here for a second.

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You recall that the previous video I told you I told you that you had a hint.

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And I also read the hint that you can use if front end as such in self.

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Position, name.

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OK, you can use this if and then use here is substring, OK, use a substring and then ask if this

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appears in here.

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OK, they are both strings.

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So this is a test of Python to check whether this statement appears in this statement.

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So this is what we're going to check.

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And in here we going to check whether whether salary like the salary with bonus would be equal to the

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calculated salary that we received multiplied by zero point one.

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OK, because we want to increase the salary by one by zero point one.

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So we're going to take it and multiply it by zero point one.

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Yeah.

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So this means this value would be increased by zero point one and it will be sent to here.

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And the other type of bonus we had is self years of experience, bigger than two years.

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So anyone with more than two years of experience will also receive a bonus.

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So are you going to place it here?

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And the calculated salary multiplied by zero point to OK and then print the bonus.

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For the position is and here I'm going to state inside these brackets because we're going to pursue

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two variables.

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First one is self positioning, and the second one is salary with bonus.

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OK, so the bonus for the position.

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Is salary with bonus.

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OK, so we have completed this method as well.

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And what we are left to do is just to print out from the child, OK, you can you can see here that

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we up until now, we handled with these methods.

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They belong to the parent and we are left with this method with which belongs to the child.

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And right here, we were asked to print out a certain sentence that would include the position name

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and the salary with bonus.

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Yeah, the salary with know the name of employee and the positioning.

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My mistake.

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OK, so print the employee.

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Then its name.

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Works as a position name in our company.

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Yeah, and out here, percentage brackets, I don't have self name call myself.

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Positioning.

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All right, I think we're done off creating the content of all of the methods across the children and

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the parents, and now we're only left to execute.

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Off method's.

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Yeah, not executed to execute, yeah.

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So first one would be junior position programmer that calculate salary and by going up in here, OK,

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calculated salary, we were supposed to return the value out of this method, right.

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We're supposed to return this value and then use this value and inserted here.

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And we can achieve it by using the return key word and then calculate the salary, and that way we're

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basically taking what we have inside this calculated salary and send it.

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Send it outside of this statement here and we need to create a variable here, calculated salary value.

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Yeah, again, we can put any name here, but the meaning is that from here we're going to extract the

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calculated salary because we used every turn.

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OK, so once we use a return, this statement is going to have an output of a variable and we're going

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to place it here.

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And then we're going to use the junior python program, that bonus candidates for bonus and then this

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value, the calculated salary we're going to put inside it.

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OK.

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This one.

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Then we're going to use it to calculate the bonus.

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All right, and then we're left with the sprint data, also with junior, junior python programmer doctoring

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data and we are done.

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All right.

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Just going to copy all these three or basically all these with the notes based them here.

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Copy the name of the instance and then you can see all the march here, one, two, three, I'm going

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to replace them with senior dev ops, OK, because it's basically the same.

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We're executing this method, this method and this method.

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And the difference is just we're trying to execute it now with this instance.

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OK, so I'm thinking.

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Based here.

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Based here.

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Based here.

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Done.

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OK, let's try to run it.

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All right, we have like a mix up of printouts here, so I'm just going to add here, print special

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keywords again to separate the print.

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So that's it.

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OK, we I have a correct answers here.

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We have calculations for front end.

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We have first of all, we have this salary, which is addition of one thousand five hundred to the front

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end because he has between zero and two years of experience.

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The front end.

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Yeah, he has won every year of experience.

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There is going to be added 1500 to the salary.

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So this value is correct.

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Then once we have four thousand, we're passing this variable to here and then in here he's a front

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end.

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So once we multiply 4000 by one point one, we're getting four thousand five hundred.

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OK, so this is the printout that we're getting here.

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So we got the correct answer is here as well.

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And also the last print data.

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The employee, Joseph, works as a frontyard in our company also.

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Correct.

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Then we have the dev ops and also executed for the same methods.

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So first of all, we have his salary, which is increased because he has six years.

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So let's go up in here.

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So he goes to this category here.

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So he has two thousand five hundred plus three thousand five hundred equals to six thousand, which

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is correct.

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And then this calculated salary is returned and is certainty here and in here we can see he has more

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than two years of experience.

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So we are going to take the calculated and multiplied by one point two, which equals to seven thousand

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two hundred.

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You can check it yourself, which is also the correct answer.

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And last but not least, we have the printout and data, which is the employee.

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Dan works as a senior officer in our company.

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OK, I think this concludes our part in practicing inheritance in OLP in Python was challenging.

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It was not easy.

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But I'm sure that if some of you completed it successfully, it's great.

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Even partial resolutions are also great because it's not easy, as I just said.

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And I highly recommend you to use the attachment file of the code that I wrote here.

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It's attached to the lecture and to paste it into your python, into your picture and to do some experiments

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in to compare it with your resolution.

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And if you had some errors to check what you did wrong, it's really recommended to do experiments.

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This is my preferred way of of learning new things.

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All right.

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We have completed this lecture.

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Finally, we are familiar with practicing of inheritance in Python as well.

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And I will see you in the next video.

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Thank you.