WEBVTT

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alright so we finished up in the

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previous video talking about how the
alright so we finished up in the

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intellij refactoring didn't quite
previous video talking about how the

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work when it came to some of these
intellij refactoring didn't quite

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replacement fields and it would be quite
work when it came to some of these

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a bit of work to do this manually to
replacement fields and it would be quite

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make these changes point here was that
a bit of work to do this manually to

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just wanted to draw your attention to a
make these changes point here was that

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possible pitfall with refactoring data
just wanted to draw your attention to a

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attributes but also in this video
possible pitfall with refactoring data

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we're going to show you a quick way of
attributes but also in this video

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dealing with them all the important
we're going to show you a quick way of

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thing here is that you can get problems
dealing with them all the important

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if you use this form of replacement
thing here is that you can get problems

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fields and then try to refactor the
if you use this form of replacement

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attributes later okay so we've used
fields and then try to refactor the

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regular expressions in IntelliJ once
attributes later okay so we've used

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before and their incredibly
regular expressions in IntelliJ once

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powerful and we'll be looking at them
before and their incredibly

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at using them in python code later
powerful and we'll be looking at them

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in the course for now just follow along
at using them in python code later

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and will sort out these incorrect
in the course for now just follow along

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attribute names
and will sort out these incorrect

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we're going to get intellij
attribute names

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to do a search and replace and we can do that
we're going to get intellij

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by pressing command on a Mac which I'm
to do a search and replace and we can do that

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going to do or control r on a pc and if
by pressing command on a Mac which I'm

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you need to it's the Edit menu find and
going to do or control r on a pc and if

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replace find replace what i'm going to do
you need to it's the Edit menu find and

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an alt r this little window pops up
replace find replace what i'm going to do

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they want to make sure that this reg ex
an alt r this little window pops up

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is actually ticked regular
they want to make sure that this reg ex

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expressions box in the top field we want
is actually ticked regular

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to type left parenthesis we want to put
expressions box in the top field we want

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a...
to type left parenthesis we want to put

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...
a...

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...and you can see
...

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as soon as I finish the first one it
...and you can see

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actually came up and matched a
as soon as I finish the first one it

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particular field there for us so we want
actually came up and matched a

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to replace that we just need to type...
particular field there for us so we want

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so both the curly
to replace that we just need to type...

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brace and the full stop in that first
so both the curly

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field are typed in have special meaning
brace and the full stop in that first

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in regular expressions and
field are typed in have special meaning

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that's why we having to use the
in regular expressions and

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backslash to escape them the backslash d
that's why we having to use the

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matches any digit and again you can see
backslash to escape them the backslash d

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that the occurrences are now showing up
matches any digit and again you can see

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now that I've actually into that in this
that the occurrences are now showing up

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class obviously i needed to be an enemy
now that I've actually into that in this

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.py before I started this and for the
class obviously i needed to be an enemy

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replacement in the second field and we
.py before I started this and for the

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just need to put the dollar sign one_
replacement in the second field and we

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just need to put the dollar sign one_

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now hear that dollar one means or

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specifies anything that was matched
now hear that dollar one means or

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inside the parentheses in the search box
specifies anything that was matched

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so when all set and done what we're doing
inside the parentheses in the search box

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is just adding an _ after the
so when all set and done what we're doing

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full stop
is just adding an _ after the

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then click on replace all and that takes
full stop

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care of all the replacement fields if
then click on replace all and that takes

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you happen to have made a mistake there
care of all the replacement fields if

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you can do a control z on a pc
you happen to have made a mistake there

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commands z on a mac or come up to
you can do a control z on a pc

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and then undo and then try again so
commands z on a mac or come up to

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you can't really go wrong it will just
and then undo and then try again so

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undo those last changes for you
you can't really go wrong it will just

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so now that I've done that I can close
undo those last changes for you

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down this window
so now that I've done that I can close

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go back to main and should now run for
down this window

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us you can see it's now running again
go back to main and should now run for

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properly so it wasn't the end of the
us you can see it's now running again

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world but it can be a bit scary when
properly so it wasn't the end of the

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you factor things with IntelliJ and
world but it can be a bit scary when

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your code suddenly breaks as this is a
you factor things with IntelliJ and

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common reason for refactoring data
your code suddenly breaks as this is a

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attributes in your classes and that's
common reason for refactoring data

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this form of the replacement field is so
attributes in your classes and that's

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useful i thought i'd show you what can
this form of the replacement field is so

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but what can actually go wrong and
useful i thought i'd show you what can

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possibly save you some grief in the future
but what can actually go wrong and

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if that happens to you
possibly save you some grief in the future

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of course if would use the _ to
if that happens to you

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start with we wouldn't have had a problem
of course if would use the _ to

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at all
start with we wouldn't have had a problem

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now we can still change the values and
at all

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our program still does because this is
now we can still change the values and

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python and nothing is truly private but
our program still does because this is

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there's now an indication that we should
python and nothing is truly private but

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really be changing those attributes
there's now an indication that we should

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directly
really be changing those attributes

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let's move over now to a challenge
directly

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so to help consolidate your
let's move over now to a challenge

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understanding of inheritance got a
so to help consolidate your

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challenge for you to try out so the
understanding of inheritance got a

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challenge is to try and create a vampire King
challenge for you to try out so the

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subclass of vampire now a vampire king
challenge is to try and create a vampire King

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is going to be incredibly powerful and
subclass of vampire now a vampire king

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any points of damage inflicted will be
is going to be incredibly powerful and

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divided by four vampire King objects
any points of damage inflicted will be

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will also start off with 140 hit points
divided by four vampire King objects

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so extend the vampire class to create a
will also start off with 140 hit points

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new vampire King class with those
so extend the vampire class to create a

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additional properties then you want to
new vampire King class with those

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test the new class by creating a new
additional properties then you want to

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vampire King object and checking that it
test the new class by creating a new

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does start with a hundred and
vampire King object and checking that it

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forty hit points and only takes a
does start with a hundred and

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quarter of any damage inflicted alright
forty hit points and only takes a

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so pause the video here and try that out
quarter of any damage inflicted alright

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and i'll see you when you get back
so pause the video here and try that out

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ok so how did you come up with that one
and i'll see you when you get back

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let's go through now and come up with a
ok so how did you come up with that one

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solution for this we're going to start
let's go through now and come up with a

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by creating the new class i'm
solution for this we're going to start

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going to create that just below the
by creating the new class i'm

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vampire class is going to be class...
going to create that just below the

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....
vampire class is going to be class...

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...
....

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...
...

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....
...

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...
....

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...
...

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...now this constructor will
...

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...create a new object that is exactly the same as a
...now this constructor will

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an ordinary vampire so we do need to set
...create a new object that is exactly the same as a

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the hit point value after calling
an ordinary vampire so we do need to set

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this init method on line 60 let's go
the hit point value after calling

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ahead and do that so it's gonna be self
this init method on line 60 let's go

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....
ahead and do that so it's gonna be self

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...so that's our
....

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constructor done we're going to test
...so that's our

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that in a moment but notice the single
constructor done we're going to test

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parameter we use when calling the
that in a moment but notice the single

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super init method on line 60 now our
parameter we use when calling the

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vampire class is a subclass of enemy and
super init method on line 60 now our

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vampire king is a subclass of vampire so
vampire class is a subclass of enemy and

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the method that will be called when we use
vampire king is a subclass of vampire so

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super init here is actually the
the method that will be called when we use

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vampire class init method and not the
super init here is actually the

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enemy init method now the init method in
vampire class init method and not the

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the vampire class will then call init
enemy init method now the init method in

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in the enemy class so the calls will pass
the vampire class will then call init

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up the chain with each sub class
in the enemy class so the calls will pass

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calling the init method of its
up the chain with each sub class

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superclass ok so next we need to
calling the init method of its

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override the take damage method
superclass ok so next we need to

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so that the damage is divided by
override the take damage method

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four so let's create the damage
so that the damage is divided by

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methods so def....
four so let's create the damage

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...
methods so def....

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...
...

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...so we are now dividing
...

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the damaged by 4 when we call that
...so we are now dividing

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super method and used integer
the damaged by 4 when we call that

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division here because we don't
super method and used integer

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want to be subtracting fractional values
division here because we don't

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from the hit points so if we try to
want to be subtracting fractional values

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inflict nine points of damage our vampire
from the hit points so if we try to

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king will only take two points that's
inflict nine points of damage our vampire

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because integer division
king will only take two points that's

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actually rounds down
because integer division

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alright so what about the ability to
actually rounds down

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dodge well its important to understand
alright so what about the ability to

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exactly which class is the superclass
dodge well its important to understand

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here now vampire King extends vampire so
exactly which class is the superclass

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the super method we are calling is the
here now vampire King extends vampire so

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vampire method and not the enemy method
the super method we are calling is the

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so what happens is that the vampire King
vampire method and not the enemy method

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take_damage method calls the
so what happens is that the vampire King

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method in its superclass which is vampire
take_damage method calls the

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the vampire class take_damage
method in its superclass which is vampire

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method then calls its superclass
the vampire class take_damage

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method so it calls the enemy take_damage
method then calls its superclass

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method now intelliJ has a
method so it calls the enemy take_damage

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really useful feature to help understand
method now intelliJ has a

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all of this back in the vampire King
really useful feature to help understand

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class i can hold down ctrl or command
all of this back in the vampire King

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depending on your operating system and
class i can hold down ctrl or command

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click on the word take damage in the
depending on your operating system and

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super . take damage method down here
click on the word take damage in the

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and actually click on that now notice
super . take damage method down here

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that the cursor has taken me to the
and actually click on that now notice

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take_damage method from the
that the cursor has taken me to the

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vampire class if i do that again now
take_damage method from the

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coming over here to the take damage
vampire class if i do that again now

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that's now in the vampire class click on
coming over here to the take damage

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it's now moved up the cursor to the
that's now in the vampire class click on

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take_damage method which is
it's now moved up the cursor to the

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now in the enemy class again ctrl or
take_damage method which is

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command is the key you click along with
now in the enemy class again ctrl or

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the actual method to get that to
command is the key you click along with

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work on your operating system so
the actual method to get that to

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basically you can follow the trail back
work on your operating system so

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which is great for checking exactly what
basically you can follow the trail back

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those overwritten methods are doing
which is great for checking exactly what

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alright so that's it let's now see if it
those overwritten methods are doing

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works and go back to our main py file
alright so that's it let's now see if it

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and we're going to comment out the code
works and go back to our main py file

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in the main program
and we're going to comment out the code

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do that completely and leave it down the bottom
in the main program

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instead code at the top here and what
do that completely and leave it down the bottom

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we're going to do is create a new
instead code at the top here and what

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vampire King class called Dracula
we're going to do is create a new

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Dracula...
vampire King class called Dracula

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thing we need to do because the moment
Dracula...

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you can see the vampire is there we haven't
thing we need to do because the moment

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imported this class new class we need to
you can see the vampire is there we haven't

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import vampire King like so and come back
imported this class new class we need to

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here and specify that's the vampire King
import vampire King like so and come back

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class and we're going to call him
here and specify that's the vampire King

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Dracula....so lets write it out to print him first to
class and we're going to call him

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make sure that the initial values are
Dracula....so lets write it out to print him first to

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said and he has got 240 points right then
make sure that the initial values are

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Dracula starters take damage...
said and he has got 240 points right then

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that damage will be divided by 4
Dracula starters take damage...

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so we should only get three points of
that damage will be divided by 4

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damage....
so we should only get three points of

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and see that it works so you can
damage....

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see that in this case you got started of
and see that it works so you can

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with 140 points of damage but he actually
see that in this case you got started of

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dodge successfully and therefore didn't
with 140 points of damage but he actually

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lose any hit points because I'm
dodge successfully and therefore didn't

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remembering this only a one chance in
lose any hit points because I'm

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three the dodgers and avoids all the
remembering this only a one chance in

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damage in this case he did Dodge
three the dodgers and avoids all the

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so i need to run this again this time he
damage in this case he did Dodge

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has managed to take three points of
so i need to run this again this time he

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damage 12/4 is 3 so he's left we still
has managed to take three points of

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with three lives and 137 hitpoints
damage 12/4 is 3 so he's left we still

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alright so that's the challenge
with three lives and 137 hitpoints

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completed now your solution may well be
alright so that's the challenge

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different to mine and is always that's
completed now your solution may well be

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fine
different to mine and is always that's

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the important thing is that it works not
fine

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that it looks exactly the same as have
the important thing is that it works not

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done here it's often said that if you
that it looks exactly the same as have

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ask 10 programmers to solve a problem
done here it's often said that if you

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you'll get in 11 different solutions
ask 10 programmers to solve a problem

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so there's very very rarely only one way
you'll get in 11 different solutions

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to write code so the main thing is if
so there's very very rarely only one way

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your code solution works then
to write code so the main thing is if

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congratulations
your code solution works then

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alright so hopefully that's now
congratulations

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consolidated your understanding of
alright so hopefully that's now

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subclassing and how classes can inherit
consolidated your understanding of

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from the superclass and in turn how they
subclassing and how classes can inherit

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can also be the superclass of another
from the superclass and in turn how they

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class that extends them further
can also be the superclass of another

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inheritance can be a very useful feature
class that extends them further

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but maybe because it's so often taught
inheritance can be a very useful feature

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right at the start of course is an
but maybe because it's so often taught

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object-oriented programming many
right at the start of course is an

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programmers feel they have to use
object-oriented programming many

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inheritance they go out of their way to
programmers feel they have to use

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look for ways that they can sub
inheritance they go out of their way to

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class something to produce
look for ways that they can sub

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something else they need and that's
class something to produce

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often not a helpful approach especially
something else they need and that's

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in a language like Python in python if
often not a helpful approach especially

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there's a need to use inheritance then it really
in a language like Python in python if

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should jump out at you you you wouldn't
there's a need to use inheritance then it really

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really have to go looking for it now all
should jump out at you you you wouldn't

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our enemies were enemies they really did
really have to go looking for it now all

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share common traits and we intended to
our enemies were enemies they really did

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use the more all of them in a similar way as
share common traits and we intended to

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things to bash in vent our frustration
use the more all of them in a similar way as

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so the inheritance relationship
things to bash in vent our frustration

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we created in the last few videos were
so the inheritance relationship

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probably a good way to create the troll
we created in the last few videos were

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the vampire the vampire King classes now
probably a good way to create the troll

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python relies heavily on an
the vampire the vampire King classes now

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object-oriented feature called
python relies heavily on an

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polymorphism i'm going to have a look at
object-oriented feature called

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that in the next video and find out what
polymorphism i'm going to have a look at

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people mean when they say if it quacks
that in the next video and find out what

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like a duck
people mean when they say if it quacks

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so see you in the next video
like a duck