text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
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have been pretty simple and I've just | 7,105.96 | 3.44 |
created one student but certainly if I | 7,107.36 | 3.759 |
spent more time and wrote more code you | 7,109.4 | 4.04 |
could imagine writing one program that | 7,111.119 | 4.361 |
has a list of students many more | 7,113.44 | 4.32 |
students than just the one we keep | 7,115.48 | 4.4 |
demonstrating yet it would be a little | 7,117.76 | 4.08 |
weird it's a little inconsistent with | 7,119.88 | 3.839 |
the real or the Fantasy World of Harry | 7,121.84 | 4.64 |
Potter to instantiate one two three or | 7,123.719 | 5.161 |
more sorting hats there really is just | 7,126.48 | 4.92 |
one really one Singleton if you will | 7,128.88 | 3.96 |
which is a term of Art in a lot of | 7,131.4 | 3.92 |
context of programming so let me propose | 7,132.84 | 4.2 |
that we actually improve the design of | 7,135.32 | 3.96 |
the Sorting Hat so that we don't have to | 7,137.04 | 5.159 |
instantiate a Sorting Hat because right | 7,139.28 | 5 |
now this is kind of allowing me to do | 7,142.199 | 4.4 |
something like hat one equals hat hat | 7,144.28 | 4.68 |
two equals hat hat three equals and so | 7,146.599 | 3.841 |
forth I don't really need that | 7,148.96 | 3.759 |
capability I really just need to | 7,150.44 | 4.799 |
represent the Sorting Hat with a class | 7,152.719 | 4.281 |
but I don't really need to instantiate | 7,155.239 | 3.4 |
it why because it already exists I need | 7,157 | 5.199 |
just one so it turns out in Python that | 7,158.639 | 5.201 |
up until now we've been using as I keep | 7,162.199 | 4.081 |
calling them instance methods writing | 7,163.84 | 4.72 |
functions inside of classes that are | 7,166.28 | 4.76 |
automatically past a reference to self | 7,168.56 | 4.519 |
the current object but sometimes you | 7,171.04 | 3.76 |
just don't need that sometimes it | 7,173.079 | 3.921 |
suffices to just know what the class is | 7,174.8 | 4.04 |
and assume that there might not even be | 7,177 | 4.28 |
any objects of that class so in this | 7,178.84 | 4.879 |
sense you can use a class really is a | 7,181.28 | 5.52 |
container for data Andor functionality | 7,183.719 | 5.641 |
that is just somehow conceptually | 7,186.8 | 6 |
related things related to assorting hats | 7,189.36 | 5 |
and there's this other decorator or | 7,192.8 | 3.72 |
function called class method that allows | 7,194.36 | 3.96 |
us to do just this so let me go back to | 7,196.52 | 4.8 |
my code here and let me propose that if | 7,198.32 | 5.839 |
I'm not going to instantiate multiple | 7,201.32 | 5.359 |
houses I don't really need this init | 7,204.159 | 3.96 |
method because that's really meant to | 7,206.679 | 4.121 |
initialize specific objects from that | 7,208.119 | 5.281 |
blueprint that template that mold so let | 7,210.8 | 4.72 |
me get rid of this but if I get rid of | 7,213.4 | 4.52 |
this I no longer have access to self but | 7,215.52 | 4.719 |
that's okay because it turns out in | 7,217.92 | 5.36 |
addition to their existing class methods | 7,220.239 | 5.201 |
there are also what we might call class | 7,223.28 | 5.6 |
variables and class variables exist | 7,225.44 | 6 |
within the class itself and there's just | 7,228.88 | 5.799 |
one copy of that variable for all of the | 7,231.44 | 5.4 |
objects thereof they all share if you | 7,234.679 | 4.96 |
will the same variable be it an INT or | 7,236.84 | 5.239 |
stir or in this case a list so what I've | 7,239.639 | 6.201 |
done here is Define inside of my hat | 7,242.079 | 8.12 |
class in a class variable called houses | 7,245.84 | 6.359 |
I don't say self because self is no | 7,250.199 | 3.88 |
longer relevant self refers to specific | 7,252.199 | 4.761 |
objects I want a variable inside of this | 7,254.079 | 5.761 |
class AKA a class variable that equals | 7,256.96 | 5.119 |
that list because it's inside of this | 7,259.84 | 6.359 |
hat now class I can use that list in any | 7,262.079 | 5.961 |
of my functions I've only got one now | 7,266.199 | 3.721 |
called sort but if I had more it would | 7,268.04 | 3.76 |
be accessible to all of those methods as | 7,269.92 | 4.759 |
well and with sort it also doesn't | 7,271.8 | 5.319 |
really make sense to sort within a | 7,274.679 | 4 |
specific sorting hack because again | 7,277.119 | 3.761 |
there only want there to be one so I can | 7,278.679 | 4.44 |
actually specify that this is a class | 7,280.88 | 5.239 |
method by saying at class method and I | 7,283.119 | 5.681 |
don't pass in self anymore I actually by | 7,286.119 | 5.321 |
convention pass in the a reference to | 7,288.8 | 5.319 |
the class itself it's typically written | 7,291.44 | 7.239 |
as CLS why well if you wrote C ass that | 7,294.119 | 6.681 |
would actually conflict with the keyword | 7,298.679 | 4.48 |
class that we keep using up here so the | 7,300.8 | 4.56 |
world realized that oops we uh can't | 7,303.159 | 4.201 |
reuse that same phrase here so let's | 7,305.36 | 4.319 |
just call this class this this is useful | 7,307.36 | 4.56 |
in some context including this one why | 7,309.679 | 4.96 |
well notice what I can now do I can now | 7,311.92 | 5.96 |
change self to be just class why because | 7,314.639 | 5.881 |
house is now not an instance variable | 7,317.88 | 5.44 |
accessible via self. houses it is now a | 7,320.52 | 6 |
class variable accessible via class. | 7,323.32 | 6.12 |
houses or technically CLS do houses in | 7,326.52 | 5.559 |
this case but now the final flourish is | 7,329.44 | 6.04 |
this now I don't have to instantiate any | 7,332.079 | 7.16 |
hat objects as I used to on here line 13 | 7,335.48 | 6 |
I can just use functionality that comes | 7,339.239 | 4.201 |
with this class so I'm going to delete | 7,341.48 | 3.84 |
that line Al together I'm going to | 7,343.44 | 4.88 |
capitalize the Hat on this new line 13 | 7,345.32 | 7.08 |
and just say hat. sort quote unquote | 7,348.32 | 6.759 |
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