text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
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programming but what we thought we do is | 8,273.96 | 4.88 |
focus really on some final core features | 8,275.96 | 4.519 |
that you see not just in Python but | 8,278.84 | 3.799 |
other languages as well and perhaps one | 8,280.479 | 3.801 |
of the most compelling features of | 8,282.639 | 3.241 |
object-oriented programming that we | 8,284.28 | 3.88 |
haven't yet used explicitly though it | 8,285.88 | 4.639 |
turns out we've seen implicitly over the | 8,288.16 | 5.399 |
past weeks is this notion of inheritance | 8,290.519 | 5.04 |
it turns out via object-oriented | 8,293.559 | 3.241 |
programming there's actually an | 8,295.559 | 4.561 |
opportunity to design your classes in a | 8,296.8 | 5.719 |
hierarchical fashion whereby you can | 8,300.12 | 6.439 |
have one class inherit from or borrow | 8,302.519 | 6.88 |
attributes that is methods or variables | 8,306.559 | 5.241 |
from another class if they all have | 8,309.399 | 5 |
those in common so what do I mean by | 8,311.8 | 5.16 |
this here well let me propose that we | 8,314.399 | 5.28 |
Implement uh over in vs code here a | 8,316.96 | 5.359 |
brand new file called wizard. piy let me | 8,319.679 | 6.161 |
go ahead and run code of wizard. piy and | 8,322.319 | 6.04 |
then let's start as before for defining | 8,325.84 | 5.04 |
a class called student and let's go | 8,328.359 | 4.441 |
ahead and first Define the underscore | 8,330.88 | 4.32 |
uncore init method which of course is | 8,332.8 | 3.799 |
minimally going to take an argument | 8,335.2 | 3.119 |
traditionally called self and in this | 8,336.599 | 3.441 |
case let's also have it take as before a | 8,338.319 | 4.441 |
name and a house and then in this init | 8,340.04 | 4.72 |
method let's go ahead and assign the | 8,342.76 | 4.759 |
instance variables self. name equals | 8,344.76 | 6.599 |
name and self. house equals house let's | 8,347.519 | 5 |
assume that there's some other | 8,351.359 | 3.08 |
functionality in this class as well dot | 8,352.519 | 3.721 |
dot dot but let's move on now to | 8,354.439 | 3.761 |
implementing the notion of a a professor | 8,356.24 | 4.56 |
in The Wizarding World as well so for | 8,358.2 | 5.519 |
this class let's call it | 8,360.8 | 5.559 |
professor and a professor let's say is | 8,363.719 | 4.121 |
also going to have its own | 8,366.359 | 3.32 |
initialization method so underscore | 8,367.84 | 3.839 |
underscore in it it's going to take self | 8,369.679 | 4.161 |
as always as the first argument uh a | 8,371.679 | 4.161 |
professor also has a name so we'll pass | 8,373.84 | 4.4 |
that in second to and even though some | 8,375.84 | 4.2 |
professors are heads of houses let's | 8,378.24 | 3.239 |
assume that a professor is really | 8,380.04 | 2.92 |
identified by their name and their | 8,381.479 | 3.84 |
subject area the class that they teach | 8,382.96 | 4.16 |
so we'll call this third argument | 8,385.319 | 3.881 |
subject subject now as before let's go | 8,387.12 | 4.8 |
ahead and assign self. name equals name | 8,389.2 | 5.96 |
and let's assign self. sub equals | 8,391.92 | 5.32 |
subject here and as before let's assume | 8,395.16 | 3.48 |
that there's some more functionality | 8,397.24 | 4.04 |
associated with professors as well well | 8,398.64 | 4.799 |
what do you notice already here in my | 8,401.28 | 5.039 |
definitions of students and | 8,403.439 | 5.081 |
professors typically we're a bit | 8,406.319 | 4.681 |
reluctant to allow for any redundancy in | 8,408.52 | 5.36 |
our code and here I feel like my init | 8,411 | 5 |
method is taking a name for students my | 8,413.88 | 4.12 |
init method is also taking name for a | 8,416 | 3.479 |
professor and I have these identical | 8,418 | 3.96 |
lines of code like self. name equals | 8,419.479 | 3.84 |
name and this is only going to get | 8,421.96 | 3.2 |
exacerbated if I now go and add some | 8,423.319 | 4.321 |
error checking so for instance How about | 8,425.16 | 5.48 |
if uh if not name we should probably be | 8,427.64 | 4.679 |
in the habit of raising something like a | 8,430.64 | 3.96 |
value error and an explanatory message | 8,432.319 | 5.12 |
like missing name and you know what if a | 8,434.6 | 4.6 |
professor is missing their name I should | 8,437.439 | 3.561 |
probably copy paste that code down here | 8,439.2 | 3.68 |
and that's where Red Flag should be | 8,441 | 3.6 |
going off whereby as soon as you start | 8,442.88 | 4.64 |
copy pasting code there's probably a | 8,444.6 | 4.68 |
better way so that we can write the code | 8,447.52 | 3.959 |
once and perhaps reuse it in some way | 8,449.28 | 4.36 |
and here too object-oriented programming | 8,451.479 | 4.721 |
offers a solution it turns out that | 8,453.64 | 4.24 |
object-oriented programming in Python | 8,456.2 | 4.68 |
also supports inheritance whereby you | 8,457.88 | 5.88 |
can Define multiple classes that somehow | 8,460.88 | 4.68 |
relate to one another they don't need to | 8,463.76 | 3.92 |
exist sort of in parallel in this way | 8,465.56 | 3.799 |
there could actually be some hierarchy | 8,467.68 | 3.4 |
between them so for instance in The | 8,469.359 | 3.561 |
Wizarding World we could argue that both | 8,471.08 | 3.92 |
a student and a professor are at the end | 8,472.92 | 4.64 |
of the day Wizards so maybe what should | 8,475 | 4.6 |
really Define is a third class for | 8,477.56 | 4.32 |
instance called wizard that has any of | 8,479.6 | 5.36 |
the common attributes for students and | 8,481.88 | 4.599 |
professors alike and for now we've kept | 8,484.96 | 3.16 |
it relatively simple the only thing they | 8,486.479 | 4.121 |
have in common is a name and a name in | 8,488.12 | 4.319 |
student and Professor respectively so | 8,490.6 | 4.12 |
why don't we minimally factor that out | 8,492.439 | 4.681 |
first all right so let me go ahead here | 8,494.72 | 3.88 |
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