WEBVTT

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so as I mentioned towards the end of the

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previous video one thing that really
so as I mentioned towards the end of the

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stood out with the various flow charts
previous video one thing that really

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we look at is that the new steps that we
stood out with the various flow charts

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added for both artist and album are
we look at is that the new steps that we

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pretty much identical and as a result
added for both artist and album are

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that sounded like a good candidate for a
pretty much identical and as a result

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function so what we're going to do is
that sounded like a good candidate for a

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write a function to handle that and i'm
function so what we're going to do is

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going to create the function called
write a function to handle that and i'm

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find object and then we're going to
going to create the function called

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add that before this method load data
find object and then we're going to

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on line 82 so let's go ahead and do that
add that before this method load data

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so def is going to be...
on line 82 so let's go ahead and do that

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...
so def is going to be...

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...
...

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that's all we have to do to to
...

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create this will now work with both the
that's all we have to do to to

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artist and the album and you can probably
create this will now work with both the

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see there that performs a brute-force
artist and the album and you can probably

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search in that checks the name attribute
see there that performs a brute-force

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for each item in turn and returning the
search in that checks the name attribute

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matching items as I mentioned finds one and
for each item in turn and returning the

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obviously on line 87 returns none
matching items as I mentioned finds one and

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it wasn't able to find anything now there
obviously on line 87 returns none

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are faster ways to search the list but
it wasn't able to find anything now there

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what they generally needs that
are faster ways to search the list but

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require the list to be sorted
what they generally needs that

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so we can't use in here unless
require the list to be sorted

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we sort of the list after each addition
so we can't use in here unless

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and doing that would make the code
we sort of the list after each addition

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far less efficient the code will probably
and doing that would make the code

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very slow if their were huge number of
far less efficient the code will probably

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artist but if there were a huge number
very slow if their were huge number of

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then we probably wouldn't be trying to
artist but if there were a huge number

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hold everything in memory so so one
then we probably wouldn't be trying to

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approach with a huge data file would be
hold everything in memory so so one

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to sort the data in the file first and
approach with a huge data file would be

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then process the sorted data rather
to sort the data in the file first and

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than sorting the list after each artist
then process the sorted data rather

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is added
than sorting the list after each artist

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ok so now we have a function to return
is added

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an object if it exists in the list
ok so now we have a function to return

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that's pass to it the this is the find
an object if it exists in the list

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object function now we've got that we
that's pass to it the this is the find

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can modify the load data function to use
object function now we've got that we

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new algorithm and use find object
can modify the load data function to use

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to fix the problem with the earlier
new algorithm and use find object

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program let's go ahead and do that so
to fix the problem with the earlier

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I'm just going to move this down on so
program let's go ahead and do that so

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you can see what we're working on with
I'm just going to move this down on so

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this method first change we want to make
you can see what we're working on with

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is this first test here after we've got
this method first change we want to make

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a new artist we're going to append that
is this first test here after we've got

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at the time with the first new artist so
a new artist we're going to append that

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we're going to do an artist list....
at the time with the first new artist so

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...
we're going to do an artist list....

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...
...

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...so if you get down to here with the
...

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else so else if the art the new artist
...so if you get down to here with the

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name is not equal to artist field so we just
else so else if the art the new artist

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read details for new artists we want to
name is not equal to artist field so we just

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change this a little bit now that's
read details for new artists we want to

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because we're now not storing the current
change this a little bit now that's

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album in the current artist collection because
because we're now not storing the current

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we're dealing with the new artist on line
album in the current artist collection because

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104 so i'm going to delete this second
we're dealing with the new artist on line

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line here and still going to change the
104 so i'm going to delete this second

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comment now to do be corrected what
line here and still going to change the

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we're doing we're going at this point we are
comment now to do be corrected what

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retrieve the artist object if there is
we're doing we're going at this point we are

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one
retrieve the artist object if there is

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otherwise there isn't one we're going to
one

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create a new artist object and add it to
otherwise there isn't one we're going to

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the artists list so at this point we can
create a new artist object and add it to

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put new artists going to use that
the artists list so at this point we can

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find object method that's going to be
put new artists going to use that

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new artist...
find object method that's going to be

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...
new artist...

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...
...

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ok so at this point we've got the code
...

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there for that and so checking to see
ok so at this point we've got the code

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whether new artists is none if it is
there for that and so checking to see

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going to create a new artist field bearing in mind
whether new artists is none if it is

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we are creating it based on the
going to create a new artist field bearing in mind

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artists field and we're testing for new
we are creating it based on the

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artists here and then we're going to
artists field and we're testing for new

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append the new artist as well to the artist
artists here and then we're going to

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to the artists list
append the new artist as well to the artist

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otherwise if the new artist name or new artist.
to the artists list

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name attribute attribute is
otherwise if the new artist name or new artist.

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not equal to the record we just
name attribute attribute is

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or the entry we just read from the file this
not equal to the record we just

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artist field that we've got up when we are going
or the entry we just read from the file this

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through the artist . text file that's
artist field that we've got up when we are going

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the case you can see that we've read the
through the artist . text file that's

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details for a new artist we retrieve the
the case you can see that we've read the

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artist object if there is one using the
details for a new artist we retrieve the

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find object function otherwise we're
artist object if there is one using the

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going to create a new artist object and
find object function otherwise we're

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add it to the artists list you can see me
going to create a new artist object and

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doing that there's so new artist equals
add it to the artists list you can see me

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find object
doing that there's so new artist equals

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the artists field the artists list
find object

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the two parameters and then coming
the artists field the artists list

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checking to see whether that was
the two parameters and then coming

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none which meant that the artist field
checking to see whether that was

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wasn't found under the name attribute
none which meant that the artist field

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for the in the artists list so that's
wasn't found under the name attribute

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the case i'm going to create a new
for the in the artists list so that's

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artist object the artist based on the
the case i'm going to create a new

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artists field and we're going to do artists
artist object the artist based on the

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.list . append or
artists field and we're going to do artists

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artists_list.append that new
.list . append or

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artists and we get down to here
artists_list.append that new

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setting new album to none that was
artists and we get down to here

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similar to this code here which I can
setting new album to none that was

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now take out this duplication so
similar to this code here which I can

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move this up so moving down
now take out this duplication so

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there we're going to be
move this up so moving down

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processing the new album so
there we're going to be

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if new album is none the new album
processing the new album so

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equals album we're creating that new
if new album is none the new album

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albums and that doesn't need to change
equals album we're creating that new

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at all but the other thing or the one
albums and that doesn't need to change

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thing we do want to do is you want to
at all but the other thing or the one

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work at the point of creating a new
thing we do want to do is you want to

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album we're going to be adding it to the
work at the point of creating a new

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list so...
album we're going to be adding it to the

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....
list so...

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...so we're having it at the point
....

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that we've created that but otherwise
...so we're having it at the point

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if the new album . name is not equal to
that we've created that but otherwise

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the album field then we just read the
if the new album . name is not equal to

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new album for the current
the album field then we just read the

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but again we need
new album for the current

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to change because now we're not storing
but again we need

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the album at this point we're doing
to change because now we're not storing

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something styles are different here now
the album at this point we're doing

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based on the algorithms we talked about
something styles are different here now

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in the previous video we're going to
based on the algorithms we talked about

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retrieve the album object there is one
in the previous video we're going to

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...
retrieve the album object there is one

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otherwise we are going to create the new
...

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album object and stored in the artists
otherwise we are going to create the new

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collection
album object and stored in the artists

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...ok so that's what we're gonna be doing
collection

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so to do that we need to add that find
...ok so that's what we're gonna be doing

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object call...
so to do that we need to add that find

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...
object call...

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...
...

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in other words if we found that this new
...

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album didn't exist in the name attribute
in other words if we found that this new

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for any entry in our list that was
album didn't exist in the name attribute

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passed then we're going to create the
for any entry in our list that was

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object so...
passed then we're going to create the

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...
object so...

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...
...

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and we're passing the parameters to make
...

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a valid album basically swaps so that new
and we're passing the parameters to make

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album is created before calling at album
a valid album basically swaps so that new

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which wasn't the case in the previous
album is created before calling at album

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code again is very similar to how we
which wasn't the case in the previous

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process the new artists but we're
code again is very similar to how we

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obviously dealing with albums at this
process the new artists but we're

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point and we still want to keep down
obviously dealing with albums at this

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here that code valid
point and we still want to keep down

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because you want to create a new song object
here that code valid

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at that point that's going to be new
because you want to create a new song object

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song is still equal to song the song field and new
at that point that's going to be new

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artist that still correct then likewise
song is still equal to song the song field and new

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for the album new album add song new
artist that still correct then likewise

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song that's going to be correct as well
for the album new album add song new

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now that we've done that if we just moved
song that's going to be correct as well

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and look at this last bit of code we
now that we've done that if we just moved

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don't need that processes code anymore
and look at this last bit of code we

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because with the code with built-in now
don't need that processes code anymore

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handles those last lines of codes for
because with the code with built-in now

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the last entries that before we had to
handles those last lines of codes for

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do a separate check so we can delete
the last entries that before we had to

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that and just returned at that point so
do a separate check so we can delete

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these few changes that we made change
that and just returned at that point so

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the program to use the second algorithm
these few changes that we made change

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that we discussed and add new object
the program to use the second algorithm

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to the list we doing that before
that we discussed and add new object

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populating them with their albums or
to the list we doing that before

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souls so we should be good to go that's
populating them with their albums or

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our revised algorithm there now our load
souls so we should be good to go that's

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data method or function should say so
our revised algorithm there now our load

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what we're doing now is we're going over here
data method or function should say so

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we're going to delete check folder.txt
what we're doing now is we're going over here

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because we're going to
we're going to delete check folder.txt

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go through and create again we just want
because we're going to

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to make sure that it is actually
go through and create again we just want

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working so i'm just going to select and
to make sure that it is actually

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select delete delete
working so i'm just going to select and

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and obviously that's giving us a reminder
select delete delete

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that by the way your using that
and obviously that's giving us a reminder

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its found a reference to check file.txt
that by the way your using that

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but of course we're creating that we're
its found a reference to check file.txt

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aware of that and we can ignore that
but of course we're creating that we're

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because you can see up here it does say
aware of that and we can ignore that

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these occurrences won't be changed which
because you can see up here it does say

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you would expect in this case so do
these occurrences won't be changed which

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refactor which is really just a
you would expect in this case so do

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deletion so now if we run this is just
refactor which is really just a

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do that again we'll run it and let's now
deletion so now if we run this is just

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compare the two files against so going to
do that again we'll run it and let's now

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select got an error here by the looks of
compare the two files against so going to

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it so probably a typo I made let's just go
select got an error here by the looks of

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back and have a look at that that's
it so probably a typo I made let's just go

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referring to that code of here and
back and have a look at that that's

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looking at that objects got has no attribute
referring to that code of here and

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albums think i made a typo their so that's
looking at that objects got has no attribute

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on line 122 let's look at that and
albums think i made a typo their so that's

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defining objects album field and i put new
on line 122 let's look at that and

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album albums and of course it should be new
defining objects album field and i put new

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artist . albums and I
album albums and of course it should be new

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think the rest is now correct
artist . albums and I

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ok so i think that's now correct let's
think the rest is now correct

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just try running again which would hope
ok so i think that's now correct let's

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not get an error this time
just try running again which would hope

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ok that was better also notice that
not get an error this time

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check file. txt showed up which is
ok that was better also notice that

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almost a good sign that it's working
check file. txt showed up which is

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so let's now do what I wanted to do
almost a good sign that it's working

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previously is select both those files and
so let's now do what I wanted to do

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compare them
previously is select both those files and

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so selecting both of them to the
compare them

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view and compare files i'll just go back
so selecting both of them to the

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and open that comparison and we can see
view and compare files i'll just go back

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now there aren't any differences to the file
and open that comparison and we can see

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and that is actually good news so
now there aren't any differences to the file

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note that only a single artist has been
and that is actually good news so

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created for ZZ type it's albums get
note that only a single artist has been

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printed out altogether but because the
created for ZZ type it's albums get

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list is not sorted they appear in the order
printed out altogether but because the

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that the artist was added and of course
list is not sorted they appear in the order

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ZZTop was added just after Aerosmith and
that the artist was added and of course

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also all the aerosmith albums are
ZZTop was added just after Aerosmith and

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printed together which is a sign that
also all the aerosmith albums are

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there's only one aerosmith within the
printed together which is a sign that

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artists so if i scroll to the end of the
there's only one aerosmith within the

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file just got to check down here now i'm
artists so if i scroll to the end of the

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scrolling down the left side of the
file just got to check down here now i'm

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window notice some more ZZTop
scrolling down the left side of the

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albums here to the left hand side so
window notice some more ZZTop

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that's good
albums here to the left hand side so

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on and when you are scrolling make sure
that's good

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you use the scroll bar on this side sort
on and when you are scrolling make sure

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of move up because if you come over here
you use the scroll bar on this side sort

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and use the scroll bar you get a
of move up because if you come over here

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different result because we're scrolling
and use the scroll bar you get a

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now the check file.txt
different result because we're scrolling

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instead of our original albums . txt
now the check file.txt

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the bottom line now is there now a
instead of our original albums . txt

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problem which we expected because we
the bottom line now is there now a

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did change the order of those files
problem which we expected because we

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ourselves so again just a note here you
did change the order of those files

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can't scroll down either side of the
ourselves so again just a note here you

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comparison display further down the end
can't scroll down either side of the

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of the file so make sure that when
comparison display further down the end

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you're scrolling you scroll bar for albums
of the file so make sure that when

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. txt rather than check file. txt to
you're scrolling you scroll bar for albums

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get the end of it just looking down to
. txt rather than check file. txt to

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the bottom we can see that theirs line
get the end of it just looking down to

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684 and we can see we've got that for
the bottom we can see that theirs line

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both our albums . txt and check file.
684 and we can see we've got that for

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txt and just going back to our output
both our albums . txt and check file.

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looking this down the bottom it now correctly
txt and just going back to our output

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says 28 artists and the good thing was
looking this down the bottom it now correctly

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that the ZZ top albums and songs will
says 28 artists and the good thing was

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match now match even though they're not
that the ZZ top albums and songs will

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in the same position in each file so it
match now match even though they're not

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looks as I we've got this working
in the same position in each file so it

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correctly which is fantastic and again
looks as I we've got this working

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00:13:20.179 --> 00:13:27.710
just to note we go back and have a look
correctly which is fantastic and again

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this collection here
just to note we go back and have a look

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ZZTop antenna that was the part that
this collection here

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outside of order come back
ZZTop antenna that was the part that

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here we've got the ZZ Top
outside of order come back

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we've got those but we've still got the
here we've got the ZZ Top

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other ZZ top albums and information down
we've got those but we've still got the

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the bottom of the file as well so that is
other ZZ top albums and information down

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good it those look like things are working
the bottom of the file as well so that is

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fine now I'm going to finish the video
good it those look like things are working

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00:13:52.670 --> 00:13:54.470
out here now in the next video we've got
fine now I'm going to finish the video

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a mini challenge for you so let's work
out here now in the next video we've got

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on that in the next video
a mini challenge for you so let's work