text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
with lists and so many other class as | 9,853.04 | 6.48 |
well any questions now on operator | 9,855.8 | 6.559 |
overloading or this example here how | 9,859.52 | 5.32 |
would you go about creating a function | 9,862.359 | 7.561 |
for adding a student and a vault for two | 9,864.84 | 7.88 |
two separate classes how would that be | 9,869.92 | 5.04 |
possible let me see what happens here I | 9,872.72 | 4.2 |
don't know off hand let's do this let's | 9,874.96 | 3.56 |
create a stir and see what happens if I | 9,876.92 | 4.84 |
add Potter plus a stir stir object yeah | 9,878.52 | 4.879 |
okay so it would work I'm just figuring | 9,881.76 | 3.88 |
this out as I go here Eric so just to re | 9,883.399 | 3.641 |
be clear what I did was I just changed | 9,885.64 | 3.16 |
Weasley to stir just to see what would | 9,887.04 | 4.96 |
happen when I add a vault plus a stir | 9,888.8 | 6.04 |
and it will work theoretically why | 9,892 | 5.84 |
because so long as the type of value on | 9,894.84 | 6.68 |
the left has an add method implemented | 9,897.84 | 6.519 |
other can be any type that you want you | 9,901.52 | 4.879 |
just have to decide in code what it's | 9,904.359 | 3.761 |
going to mean conceptually to add a | 9,906.399 | 3.681 |
vault plus a string which in this case | 9,908.12 | 4.12 |
probably doesn't make any sense at all | 9,910.08 | 3.68 |
but it's possible it's going to be the | 9,912.24 | 3.64 |
operand on the left and I'm inferring | 9,913.76 | 3.599 |
that I did not know the answer a moment | 9,915.88 | 3.36 |
ago I'm inferring that because what I | 9,917.359 | 4.641 |
got was an attribute error here on line | 9,919.24 | 5.64 |
11 because python did not like this | 9,922 | 5.479 |
other gallion didn't work but I could | 9,924.88 | 4.72 |
make it work by figuring something out | 9,927.479 | 3.721 |
really good question didn't know that | 9,929.6 | 5.08 |
one myself other questions on operator | 9,931.2 | 5.92 |
overloading can you define new operators | 9,934.68 | 5.4 |
in Python I don't think so there is a | 9,937.12 | 6.08 |
very long but precise list of operators | 9,940.08 | 5.279 |
that you can overload I do not not | 9,943.2 | 4.56 |
believe you can assign arbitrary | 9,945.359 | 5.04 |
characters to be operators in Python uh | 9,947.76 | 4.32 |
let me defer to Carter in the chat to | 9,950.399 | 3 |
revoke okay I'm seeing two of my | 9,952.08 | 3.239 |
colleagues are saying no not possible so | 9,953.399 | 3.281 |
I'm going to go with my first instinct | 9,955.319 | 3.201 |
no otherwise that'd be kind of cool you | 9,956.68 | 4.04 |
could make Emoji do whatever you want to | 9,958.52 | 4.28 |
how about one final question on operator | 9,960.72 | 4.24 |
overloading is that the only operation | 9,962.8 | 5.679 |
you can do uh is a far as like can you | 9,964.96 | 5.88 |
do a subtraction as well you can you can | 9,968.479 | 5.401 |
do so many others let me um if Carter | 9,970.84 | 5.72 |
you don't mind pulling up this URL here | 9,973.88 | 4.64 |
so this link here special method names | 9,976.56 | 4.44 |
in today's slides you'll see a long list | 9,978.52 | 3.959 |
of all of The Operators that you can | 9,981 | 3.439 |
overload you can do less than equals | 9,982.479 | 4.321 |
than plus equals minus equals pretty | 9,984.439 | 4.241 |
much any symbol you've seen me type on | 9,986.8 | 3.519 |
the screen can be overloaded in the | 9,988.68 | 3.52 |
context of | 9,990.319 | 4.761 |
classes so even though today we focused | 9,992.2 | 4.84 |
entirely on object-oriented programming | 9,995.08 | 3.08 |
this is a technique that we've been | 9,997.04 | 2.92 |
using really since the first week of the | 9,998.16 | 3.72 |
class because indeed those ins those | 9,999.96 | 4.439 |
stirs those floats those lists those | 10,001.88 | 4.28 |
dictionaries and so much more we're | 10,004.399 | 3.281 |
already underneath the hood this whole | 10,006.16 | 4.279 |
time classes and objects thereof but you | 10,007.68 | 4.32 |
now as a programmer have the ability to | 10,010.439 | 3.481 |
create your own classes with your own | 10,012 | 3.64 |
instance or class variables with your | 10,013.92 | 3.68 |
own instance or class methods with your | 10,015.64 | 4.4 |
own properties and even with your own | 10,017.6 | 4.64 |
custom behavior for operators so | 10,020.04 | 4.359 |
ultimately you can absolutely continue | 10,022.24 | 5.039 |
using those simple tuples or lists or | 10,024.399 | 4.761 |
those dictionaries or other structures | 10,027.279 | 3.881 |
as well but object-oriented programming | 10,029.16 | 3.6 |
and with it classes and now these | 10,031.16 | 3.279 |
objects is just another tool in your | 10,032.76 | 3.88 |
toolkit and dare say as your code gets | 10,034.439 | 4.321 |
more sophisticated and your problems get | 10,036.64 | 3.88 |
bigger you'll find that being able to | 10,038.76 | 3.88 |
model these real world or even fantasy | 10,040.52 | 4.6 |
world entities with classes and related | 10,042.64 | 4.48 |
data and functionality will ultimately | 10,045.12 | 3.84 |
just allow you to Define code that's not | 10,047.12 | 4.68 |
just correct but ever well designed as | 10,048.96 | 6.6 |
well this was | 10,051.8 | 3.76 |
cs50 | 10,059.96 | 3 |
[Music] | 3.4 | 9.859 |
[Music] | 15.28 | 6.869 |
all right this is cs50's Introduction to | 24.56 | 4.799 |
programming with python my name is David | 27.48 | 3.879 |
men and this is our week on regular | 29.359 | 4.641 |
Expressions so a regular expression | 31.359 | 4.961 |
otherwise known as a Rex is really just | 34 | 4.36 |
a pattern and indeed it's quite common | 36.32 | 4.12 |
in programming to want to use patterns | 38.36 | 4.679 |
to match on some kind of data often user | 40.44 | 4.56 |
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