CS50x 2024 - Lecture 6 - Python

***
This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming.
***
TABLE OF CONTENTS
00:00:00 - Introduction
00:01:01 - Python
00:07:24 - Speller
00:13:41 - Filter
00:17:31 - Face Recognition
00:20:53 - Functions
00:33:24 - Types
00:34:47 - Calculator
00:44:45 - Conditionals
00:48:05 - Compare
00:57:18 - Object-Oriented Programming
01:02:54 - Loops
01:13:51 - Meow
01:21:20 - Truncation
01:25:54 - Exceptions
01:33:22 - Mario
01:39:44 - Lists
01:49:18 - Dictionaries
01:59:58 - sys
02:04:04 - pip
***
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***
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LICENSE
CC BY-NC-SA 4.0
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License
creativecommons.org/licenses/...
David J. Malan
cs.harvard.edu/malan
[e-mail]

[@justanothernothuman]

"Malloc is gone, pointers are gone, free is gone!" thanks to the lord !

[@jeannoelhonisch7037]

100%

[@kennessu4642]

used to pray for times like these

[@VIPER_12328]

Same lol

[@pratyush842]

My dream

[@jrb65]

What an amazing professor. Not a single boring moment .

[@harshgawali5154]

The ending was damn! 😂 well done CS50

[@sefonefinpsefnpefn4191]

I like it!❤

[@neclis7777]

Incredible teacher, as much a stand up performer as an expert in his field. What energy he puts in his work ...

[@FarizDarari]

It's mindblowing how a course video with such content quality is free. Thanks, huge thanks, CS50!

[@Zachattack0_0]

Well, remember, to get a certificate costs about $200. So the course is free to access, but they are certainly making their money back with the number of certifications they give out!

[@AA-cy9ib]

@@Zachattack0_0 Not true! They also give free certificates which are almost as valuable as paid ones.

[@Zachattack0_0]

​@@AA-cy9ib Where? AFAIK you have to pay for an official Harvard CS50 certificate.

[@ihavermsthattypeofbrain8377]

​@@Zachattack0_0not really. I think when you go to Harvard edu it's available. It actually have same value as the $200 one

[@AskforQAli]

Happy New year to you all!! May 2024 be the best year for your personal growth

[@brooksgunn5235]

Ah, the endings are always funny and uplifting!

[@emiliosaliba8320]

Best IT proffessor i ever had, amazing explanations , dinamic, thanx a lot from a poor southamerican

[@mtarik0]

57:18 What a beautiful way to explain what OOP is in basic terms!

[@bekay7663]

it might because of my little knowledge of OOP previously before starting the course or the Weeks leading up, but in that 5 minute segment I fully understand object oriented programming, or at least have a solid grasp of it.

[@mtarik0]

That's awesome! I do believe that playing around with C language first makes the transition much better. I started learning programming with Java, and even though our instructors explained us the OOP term in similar ways, we as learners sort of took it for granted. It was because we didn't know what it was like a variable not having built-in functionalities, its advantages, etc. This is why I love CS50 :) Since you feel like as such, you will probably have an easy time of understanding encapsulation, inheritance and the like, best of luck! @@bekay7663

[@bassycounter]

“I apologize if you’re harboring resentment that this wasn’t a week earlier” 😂It’s okay professor, I have accepted that to understand programming and computer science better, I must dive into lower level stuff occasionally, week 5 was tough but I persevered!

[@xiaoyangshawnhuang1251]

Just amazing lecture, love it, well done!

[@angelofinassu4867]

Finally python friends, I discovered CS wold through python years ago, but now with a university, it's very rewarding to go back to studying once again

[@pranshuatrey]

What a perfect ending

[@DeshBhakt588]

Super energy 😊

[@hedgehog_hey]

TKS U ! CS50 , and the professor Malan Miller!🥰

[@Ubiselfs]

Man I love this guy

[@prjerry7777]

He is an excellent teacher.

[@user-si4tb7cr9t]

lovely class, extraordinary

[@hhhhh00000]

Wish i had just one teacher like David Malan or Brian Yu in my entire education journey . :-)

[@user-ji9gq3pu1d]

What an amazing lecture and it is so brilliant to teach C first and then move to Python. After all that C, Python will be gravy train!

[@aopen130]

can't wait for Javascript lecture so it will break everything we learned here.

[@jiffy5210]

the ending was great !!

[@zahidsayil9066]

love the energy

[@user-bs9hz1eu7s]

oh wow!! one of the best python video to learn

[@sefonefinpsefnpefn4191]

finally python 🎉❤

[@user-jc7md5mi4g]

Дякую! 🙂

[@willperry1147]

Blessed thank you

[@user-fe4ru2op1x]

From EGYPT THIS IS GREAT❤

[@Dragon4526]

Another year, Another CS50

[@symbolminded5167]

Keep grinding boys

[@hasirash6786]

Ending was so funny lol

[@shinthantkaung]

GOD BLESS YOU!!!!!!

[@ryokudoom]

Can't believe i got rickrolled when rolling into my coding class

[@Serhii007]

Дякую!

[@zsunnder2355]

Best Ending🤣🤣

[@eleos11]

When I watch David's lectures I like to follow copying the code. However, here I wonder where are all those files like speller.py reside, so that I could use them. Is there a repository of some sort? Any ideas?

[@Mustafa_Tahaha]

Struggling through C to reach the holy grail that is Python!

[@radman999]

Would be better off sticking with C and C++ instead of a bloatware script language that anyone's mom can do

[@mclaren720]

@@radman999how many years have you been coding?

[@Rayer24]

@@radman999

[@asadelh.28]

​@@radman999bloatware script language thats one of the most popular and most used languages in the world, way more than C and C++ and that basically has a monopoly over AI. Youre one of those smooth brains who thinks theyre smart because somehow using verbose languages compensates for your inherent lack of programming skill

[@user-mo9bc8lo6b]

Monty PYTHON

[@javanatto]

Oh, my! We've got rickrolled...again. what a perfect ending for a lecture, that's the perfect description XD

[@chinmayachidrewar8856]

you ruined it for me🥲

[@bx7gamer]

Can someone please list all the modules (pip) installed during the course! ,thanks in advance

[@aopen130]

`pip list` in the command prompt. if it doesn't work, make sure the virtual environment is in your PATH you can learn more about syntax for pip list command with `python -m pip list`

[@wonkanese]

I can feel David Malan's energy

[@quangluu79]

👍👍👍

[@zikeng5444]

There's no goddamn way we got rickrolled by harvard university

[@Jonathanmillspatrick]

Is there a rationale for the extra spacing, two blank lines, between code?

[@brandy9725]

David explains at 1:27:08 that it's a convention to help make functions stand out

[@user-dz8me4sp8m]

The dictionary part is a littlebit tough haha.. there are crazy syntax like what he said

[@tiagoantonio2343]

I LOVE PYTHON

[@spodi4real]

how come i did not know about this amazing thing called cs50 I regret every second in my life i didn't know about this!!

[@kitgary]

Can we have a CS50 lesson teaching how to crack the programming interview?

[@fakrulotaku5655]

The ending 😂😂

[@jesuscarrillo7411]

Great

[@kenyhu4759]

Good day

[@airkh.]

the rickroll at the end lmaoo

[@georgimmitev]

1:15:24

[@grindinguy]

i knew it but im rickrolled too :)

[@ShahbazG]

problem set? 🤔

[@mfbbbbbbbbbbbbbbbbbb]

Greatest rickroll 2024

[@randomenia]

I don't speak english I'm watching whit Subtitule I have 16 years old You're The Best sorry for error

[@nazmulalam7125]

Melan. How are YOU?

[@fakrulotaku5655]

2:03:52 is kinda hilarious 😂

[@PhilipDenys]

dude is mark rover's brother :D

[@elijahsalarda6497]

i think i will like python haha 🤤

[@d.k.1545]

question; at 1:56:55 David is making the dictionary caleld people, but he never defines the name person. Yet below that person exists anyway? Why not just do; for name in people: instead and skip the next line ?

[@d.k.1545]

or does he just use person instead of the generic n variable like _ ?

[@VijayGandhinagar]

At 1:56:55, the variable "person" is a list of dictionaries, and not a list of strings or integers. Hence you have to access the dictionary first and then look/check if the dictionary has that name, for each dictionary in the list.

[@d.k.1545]

@@VijayGandhinagar thanks for your reply! really appreciate it. However my question is more so that he doesn't define or initiate a variable or typedef called person and suddenly uses it as for person in (dictionary set name) so it it just an n variable here?

[@d.k.1545]

Having watched the section I understand it now. as I assumed it's basically an initialized variable with the chosen name person, and it's looking for the input name in the dictionary key of name

[@henriktandberg9899]

@@d.k.1545 The "person" variable in this case is just like the i in for loops conventionally used in C. It's just a more describing name for the variable doing the counting of each iteration of the loop. I was a bit confused by this as well, but David could have used i or _ as he mentioned earlier and had the same result. He just chose person as it was iterating through dicts of people.

[@boks02_]

malloc(); is GONE 🗿free(); is GONE🗿*pointers are GONE🗿

[@harisuresh2507]

im sold on python rn

[@wonkanese]

Give me that

[@tahmidnewaz3082]

Did I just get Rickrolled?

[@mk810]

Anyone else kind of recognize that URL by now? 😆

[@juli.72]

got me with the rick roll

[@fayzullohkarimov48]

Like if you never skip intro mucis

[@waffle6579]

I hope professor Malan can cosplay prison Mike.

[@karacg]

who can learn all this any Prior Experienced

[@MrMfrk]

old lecture is posted here in 2024

[@HolyHaddock]

You mean that this is the 2023 lecture? Sorry me English bad

[@farhanarahman9375]

nope this is the lecture for 2024

[@ShubhamJha-rl9ss]

who else got rick rolled ?

[@syedzainulabideen4455]

1like = 5pushups in 2024

[@user-go.pro1]

Hi!!!!,bro you gonna die

[@mclaren720]

I will join you my brother.

[@turtlebeast8812]

​@@mclaren720I will also join. let's get strong and smart together bros 💪💪💪

[@mlfelonzo9156]

Do my pushup bruh make sure

[@td3de176]

You owe 305 pushups bro

[@JoseLucasd]

Nah, ill stay with C.

[@user-vo2tu9hc7z]

why?

[@user-vo2tu9hc7z]

Python is AI bro come on in

[@JoseLucasd]

@@user-vo2tu9hc7z python is heavy af. It takes like, 40s to run a encryption, and even a compiler like numba or cpython doesnt helps that much, bc python is natively slow. And also, its just too "washed out". Most of python libs like that used for ia or smth is written in c or c++. Thats the reason i dont like it. If it works for u, just use, bc u need to solve problems. And now machines r super fast unlike mine.

[@TonyTony-dl9xr]

Nothing new All time same 😂😂.But we always watch.I got it that study in University and pay for the study waste time and money. When in the KZbin available free Tutorials and Bootcamps.But after graduated University your knowledge not enough get job in IT company. You go to KZbin improve your knowledge for get job. I think it is simple and true fact by my own opinion.

[@hannukoistinen5329]

Unbelievable crap!!!

[@nureke-dp1nw]

We support Harvard's former president who wasn't afraid to speak the truth!

[@d.k.1545]

Please give me more context.

[@Samsung-zg9ql]

Whole of Python in one lecture. What's the point of watching this

[@davidbarnhouse4642]

This is an intro class. The point is to introduce you to the topic not make you a master.

[@Samsung-zg9ql]

@@davidbarnhouse4642 rather than making 500 introductory videos of 500 different languages it would be a lot beneficial to make videos of a few topics explaining in detail.. Can't believe people suggest cs50 which is clearly a waste of time...

[@CoreyHillesheim]

This is just scratching the surface. The CS50P lectures are 16 hours long and only cover the basics.

[@davidbarnhouse4642]

@@CoreyHillesheim yes, that's the point.

[@belabansal3356]

@@CoreyHillesheimthey taught like till week 4 of that in this video tbh. I am on week 8 currently of python. But you don’t get the detail of cs50 p obviously. And here and there, there were hints of other weeks

[@VeNoMoP_69]

For every like I will write 10 lines of python code

[@-es2bf]

They teach you this in high school in europe. lol cant imagine people let their rich parents pay for this basic stuff. total rip off.

[@kejtos5]

Ignoring the fact that each country in Europe has their own education system, I am pretty sure vast majority of people has not done any programming at high school and any programming at uni, let alone python.

[@-es2bf]

@@kejtos5 Most of the people I went to uni with already knew how to code. They wrote their own Java apps in high school. This course is a joke to be honest. How come americans dont feel ripped off, when they go into a lifetime debt to learn the equuvalent of a european high school

[@kejtos5]

​ @-es2bf Again, regardless of the quality of US unis (or lack thereof), there is no 'european high school' as every country has their own learning curriculum. The few CS-ish oriented high schools might teach something like Java (or C/C++), but I am almost 100% positive it is not the norm for high schools at most places. And also, universities don't tend to assume any knowledge and starts from the absolute beginning anyway.

[@d.k.1545]

yeah...not everywhere in Europe bud. Sounds like you went to a school that thought itd be good to teach python, which I hope you enjoyed and helped you in this course.

[@staying_substantially]

Bro it is one lesson, I doubt your high school in europe taught all that in one day

[@shanksshaki]

ḍamn that teacher so fast speaking :O , i dont heard , that why im disble person ,reading subtitles only

[@dazai826]

2:08:11 woww.... first time i got rickrolled without realising it at all.... kzbin.info/www/bejne/rqepi52larWafZI link of qr code.

[@arungjose1849]

Now I can tell my friends that David rickrolled me 🥲😂

[@karimashraf-mb5wb]

🔥iam trapped in this course but love it 🤍🖤