text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
change in it except to get rid of this | 5,696.199 | 5.321 |
duplicate error checking now because | 5,698.84 | 6.44 |
again if I use self. name equals here | 5,701.52 | 5.96 |
and self. house equals here with no | 5,705.28 | 4.56 |
underscore both of those assignments are | 5,707.48 | 4.8 |
going to go through my two Setter | 5,709.84 | 4.48 |
functions now before we run this let me | 5,712.28 | 3.839 |
go ahead and remove this adversarial | 5,714.32 | 3.319 |
code which we know won't work because | 5,716.119 | 3.56 |
we're catching it let me go back down to | 5,717.639 | 3.801 |
my terminal window and run python of | 5,719.679 | 4.321 |
studenty enter let's type in Harry let's | 5,721.44 | 4.4 |
type in Gryffindor and that seems to | 5,724 | 4.159 |
work let's try though again to run | 5,725.84 | 4.359 |
python of studenty with Harry from | 5,728.159 | 5.441 |
number four private drive this will not | 5,730.199 | 6.241 |
work a value error with invalid house | 5,733.6 | 4.079 |
because that's not one of the four | 5,736.44 | 3.279 |
Hogwarts houses and now for good measure | 5,737.679 | 3.641 |
let's run it one more time and let's not | 5,739.719 | 3.641 |
even give it a name let's just hit enter | 5,741.32 | 4.12 |
when prompted I can type anything for | 5,743.36 | 3.4 |
the house I'll go ahead and still give | 5,745.44 | 3.64 |
it Gryffindor enter now we get another | 5,746.76 | 5.16 |
value error but this one is for missing | 5,749.08 | 5.48 |
name so we seem now to have all the more | 5,751.92 | 4.799 |
of a defense mechanism in place to | 5,754.56 | 4.28 |
ensure that name is as we expect it's | 5,756.719 | 4.361 |
got to have some value that's not blank | 5,758.84 | 4.04 |
and houses as we expect it's got to have | 5,761.08 | 5 |
one of those four values but at the risk | 5,762.88 | 5.319 |
of bursting everyone's bubble and making | 5,766.08 | 4.48 |
you wonder why did we just go through | 5,768.199 | 6.281 |
all of that unfortunately python really | 5,770.56 | 7.28 |
focuses on conventions not hard | 5,774.48 | 5.96 |
constraints and by that I mean this if I | 5,777.84 | 5.2 |
go back into my function after I've | 5,780.44 | 5.679 |
gotten a student on line 30 and I try to | 5,783.04 | 5.159 |
adversarially do something like this | 5,786.119 | 4.161 |
student. housee equals quote unquote | 5,788.199 | 5.161 |
number four Private Drive we know this | 5,790.28 | 5.6 |
won't work because my Setter for house | 5,793.36 | 5 |
is going to catch this watch again | 5,795.88 | 3.72 |
python of | 5,798.36 | 3.799 |
studenty uh let's type in Harry let's | 5,799.6 | 4.44 |
type in Gryffindor which will at least | 5,802.159 | 4.96 |
pass our check that's induced by in it | 5,804.04 | 6.679 |
but line 31 is going to trigger the same | 5,807.119 | 5.12 |
Setter to be be called and we're going | 5,810.719 | 3.92 |
to raise a value error saying invalid | 5,812.239 | 5.201 |
house unfortunately and if some of you | 5,814.639 | 4.48 |
are already thinking a little | 5,817.44 | 3.84 |
adversarially tragically look what you | 5,819.119 | 5.961 |
can do you can change house to be uncore | 5,821.28 | 6.359 |
house why well the instance variable is | 5,825.08 | 6.159 |
now called underscore house the property | 5,827.639 | 5.761 |
is called house no underscore but the | 5,831.239 | 4.48 |
underlying attribute implemented as an | 5,833.4 | 5.16 |
instance variable is still called | 5,835.719 | 6.121 |
underscore house and tragically python | 5,838.56 | 6.559 |
of student. py let's type in Harry let's | 5,841.84 | 5.6 |
type in Gryffindor which is correct but | 5,845.119 | 5.401 |
Watch What Happens now oh my God we | 5,847.44 | 6.44 |
slipped through so what was the point of | 5,850.52 | 5.48 |
all of this emphasis from me on doing | 5,853.88 | 4.52 |
things the right way the pythonic way by | 5,856 | 4.48 |
having this getter and Setter well | 5,858.4 | 4.799 |
unlike languages like Java that just | 5,860.48 | 5.119 |
prevent you from doing things like this | 5,863.199 | 4.361 |
python itself allows you to specify that | 5,865.599 | 3.961 |
certain instance variables can be public | 5,867.56 | 4.2 |
and accessible to anyone's code or | 5,869.56 | 4.84 |
protected or private which means that no | 5,871.76 | 4.2 |
one else should be able to change these | 5,874.4 | 4.48 |
values in the world of python it's just | 5,875.96 | 5.159 |
the honor System it's not baked into the | 5,878.88 | 3.92 |
language itself that there's a notion of | 5,881.119 | 3.52 |
visibility public or private or even | 5,882.8 | 3.919 |
somewhere in between protected instead | 5,884.639 | 3.52 |
you're on the honor System and the | 5,886.719 | 4.801 |
convention generally is if a instance | 5,888.159 | 6.161 |
variable starts with an underscore | 5,891.52 | 4.84 |
please don't touch it like just don't | 5,894.32 | 3.96 |
like that's on you if you touch that | 5,896.36 | 4 |
variable and break things the underscore | 5,898.28 | 3.72 |
is meant to signify a convention that | 5,900.36 | 3.759 |
this is meant to be private but it | 5,902 | 3.56 |
really just means please don't touch | 5,904.119 | 2.52 |
this sometimes if there's two | 5,905.56 | 2.88 |
underscores which you can use two that's | 5,906.639 | 3.52 |
an even greater effort by programmers to | 5,908.44 | 3.719 |
say really don't touch this but | 5,910.159 | 3.56 |
technically speaking there's nothing | 5,912.159 | 4.161 |
stopping you or me from circumventing | 5,913.719 | 5 |
all of these mechanisms these properties | 5,916.32 | 3.96 |
these Getters and Setters we're | 5,918.719 | 3.561 |
ultimately just on the honor System not | 5,920.28 | 4.359 |
to do so when we see instance variables | 5,922.28 | 4.8 |
prefixed with one or perhaps even two | 5,924.639 | 4.881 |
underscores all right so this is a lot | 5,927.08 | 4.119 |
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