CS50x 2024 - Lecture 6 - Python

[@jrb65]

What an amazing professor. Not a single boring moment .

[@justanothernothuman]

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

[@jeannoelhonisch7037]

100%

[@kennessu4642]

used to pray for times like these

[@pratyush842]

My dream

[@NOOR-dy6yn]

waiting for : coding gone ...

[@ZerubbabelT.]

@@NOOR-dy6yn Maybe next week when AI arrives😄

[@neclis7777]

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

[@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!

[@tower1990]

I was completely lost in week 4 and 5. For now, guess I’ll just forget all about them🤣🤣🤣

[@gauravrawat.7]

00:02 Transition from C to Python 03:11 In Python, programs no longer need to be compiled before running, unlike C programs. 07:11 Python allows escaping of apostrophes and offers quicker implementation for real work. 09:19 Defining functions and manipulating sets of words in Python 13:41 How to blur an image using Python and PIL library 15:54 Python makes solving problems more efficient and readily. 20:16 Python's popularity and CS50's goal to teach programming 22:05 In Python, you import the name of the library instead of including a .h file, allowing for more precise control over the specific functions you want to use. 25:49 Python provides three ways to concatenate strings. 27:57 Different ways of concatenating strings in Python 31:50 Python makes variable declaration and manipulation simpler. 33:54 Python simplifies variable types for ease of use. 37:43 Input from keyboard is treated as strings in Python 39:52 Converting x and y to integers in Python using int() function. 43:43 Importing libraries and avoiding function collisions in Python. 45:45 Python uses indentation instead of curly braces for code blocks 49:32 Python strings behave differently than in C 51:33 Python is meant to be higher-level and more accessible. 55:43 Designing a solution for handling Y and Yes without capitalization. 57:40 Strings in Python come with built-in functions for operations like uppercase, lowercase, etc. 1:01:46 Introduction to using loops in Python 1:03:42 Python uses a more concise syntax for looping compared to C. 1:07:23 Python makes looping easier than C using iterable objects. 1:09:23 Python's print() function can customize line endings. 1:13:42 Introducing loops and creating functions in Python 1:15:29 Defining and calling a custom function in Python 1:19:24 Enhancing function implementation with parameters in Python 1:21:13 Python handles truncation differently than C 1:25:00 Python has advantages over C in handling floating point precision and integer overflow. 1:26:57 Introduction to using functions in Python 1:30:51 The get_int() function in Python involves input, conversion to integer, and exception handling for ValueError. 1:32:41 Handling exceptions in Python and using loops to create Mario-like structures 1:36:32 Using loops and Pythonic implementation 1:38:36 Python lists automatically handle memory and are like linked lists 1:42:30 Python allows for easy manipulation of lists using built-in functions and methods. 1:44:38 Adding lists in Python and linear search 1:48:20 Python allows for efficient searching and data storage using dictionaries. 1:50:25 Creating a list of dictionaries in Python 1:54:35 Python uses square brackets with strings to access dictionary instead of dot notation used in C. 1:56:26 You can simplify dictionaries and use single quotes to avoid mixing double quotes in Python. 2:00:44 Using command-line arguments and sys library in Python 2:02:44 Using sys module in Python for command-line arguments and program exits. 2:07:01 Creating QR code in Python.

[@ranting8677]

Thank you my man

[@katosembatya8353]

Thank you

[@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

[@padhlekaamaayega]

@@Zachattack0_0 nope

[@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

[@lebronuy2223]

They just rickrolled an entire lecture room 😂

[@JorysMAHAMBA]

and all of us too 😂

[@emiliosaliba8320]

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

[@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

[@brooksgunn5235]

Ah, the endings are always funny and uplifting!

[@AskforQAli]

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

[@taha7shaikh]

Once again, What a lecture! Forever grateful to the cs50 team for putting this course up for free. We love it.

[@harshgawali5154]

The ending was damn! 😂 well done CS50

[@sefonefinpsefnpefn4191]

I like it!❤

[@aopen130]

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

[@hhhhh00000]

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

[@prjerry7777]

He is an excellent teacher.

[@nathaishik]

1:56:45 For those who are using Python 3.12 (can't say about the above versions just now), you can use double quotes inside as well (tho I would personally avoid it to reduce confusion and maintain backward compatibility)

[@tower1990]

This makes me appreciate Python much more. Thank you

[@zikeng5444]

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

[@jae_pmin]

we sure did

[@hedgehog_hey]

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

[@GenZ_01_]

Well done, I appreciate your efforts cs50 team . Thank you so much!

[@Ubiselfs]

Man I love this guy

[@chris-w5r6i]

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!

[@pranshuatrey]

What a perfect ending

[@ChickpeaMilkshake]

Broken my collarbone last week, but watching this keeps my mind off the pain.

[@RameezRassel]

the bots are getting crazy these days

[@ChickpeaMilkshake]

@@RameezRassel lol I wish it weren't true

[@MudasirChanna-m3d]

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

[@xiaoyangshawnhuang1251]

Just amazing lecture, love it, well done!

[@fvilpaz]

this lecture, one of my favorites

[@UNISTUDY-p9p]

From EGYPT THIS IS GREAT❤

[@公主肥肥]

lovely class, extraordinary

[@DeshBhakt588]

Super energy 😊

[@monitorstolenfromikea]

Lowkey gonna miss C 😢

[@logigen]

NOT ME

[@leandrokapfer5859]

@@logigen😂

[@abdiwelihashi1475]

@@logigenI Second that😭

[@rickymort135]

Me too, why we gotta change?

[@AmitojSingh_2402]

I did not expect to get rickrolled by David J Malan in a CS50 lecure from Harvard 😭😭😭🙏🏻

[@mickytananu5908]

We're getting rickrolled 2nd time with this one 🗣🗣🗣🗣🔥🔥🔥🔥🔥🔥🔥🔥

[@codereboot9765]

?? Second time?

[@mickytananu5908]

@@codereboot9765 There was a file that if you open in hex editor or smth you will see a link that send you to rick. I forgot to detail

[@GosuNoKami]

@@codereboot9765some of us switched from another video to this updated playlist

[@NookStudios]

@@codereboot9765probably from the lecture about html, Js, css.

[@ryokudoom]

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

[@freelance-writer]

"Phew! That was a lot." - David, before every break. 😆

[@sefonefinpsefnpefn4191]

finally python 🎉❤

[@aftertwentea]

Can't get enough of this intro.

[@RealMoaaz]

No way i got rick rolled at the end , amazing lecture , thank you cs50 :)

[@certified.bibliophile]

This has to be one of the top rickrolls ever😂

[@sosummer217]

Fabulous professor, thanks!

[@Dreadnought-142]

Imagine getting rickrolled by a professor + in 2024 + A course + by a qr code.

[@symbolminded5167]

Keep grinding boys

[@altaygallagher]

this man is a legend

[@programme371]

Are you for real professor??? You are scaring out new programmers!!! Dont throw buckets at them. Let them grasp the knowledge. Btw.. huge respect to you sir.

[@seiitkhanotegali7734]

YO CS50 we actually don't need to use sys to run exit. instead of sys.exit(1) we can just write exit(1) without the sys. 2:03:00

[@sharanya005]

Since we are importing the complete library we need to type sys.exit()

[@KiraIsGod]

@@sharanya005 no need to import the library to use exit()

[@Dragon4526]

Another year, Another CS50

[@zahidsayil9066]

love the energy

[@SyariefAzman]

im so getting used to the for loop and writing datatype . this is so new to me 😅

[@fayzullohkarimov48]

Like if you never skip intro mucis

[@legocis]

Дякую! 🙂

[@jiffy5210]

the ending was great !!

[@itslonewolf742]

Java mentioned. Let's go!!

[@hgamerz1238]

I knew it at the last I was having a feeling great ending

[@220SouthlandAve]

You made it past week five ‐ give yourself a pat on the back (maybe two)!!!

[@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🥲

[@wjjohns04able]

At 1:53:47, does anybody know where “person” came from? I understand “people” but I didn’t catch how he pulled “person” out of that.

[@sukhman._]

Are you saying in the for loop on line 9. If yes, it is the name of the variable. Like how in C we name data structures, node *n = this_and_that. person, here is just a variable he used inside the for loop. You could replace person with i or anything else, it will work same.

[@shaadpatel20]

it's the same as for x in people here x or "person" are temporary variables that holds a value of an element of people. for example: if name = John then person will be Carter, then the condition is checked, we know John is not Carter then person will be David, again the condition will be checked, we know this is false too then lastly person will be John, and we know that now, person = name, therefore finding the contact succesfully

[@sukhman._]

What the loop is doing is, it is take the first pair of green curly brackets, assigning it to a variable named person. By doing this, keys(here, name and number) can used to access the value related with them(here, in first green bracket, carter and that long number.

[@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

[@MidnightV6]

@@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

[@cachaça_baby]

Monty PYTHON

[@Reeta-i9z]

David sir, what did you code in your bridge.bmp program ?

[@hasirash6786]

Ending was so funny lol

[@ruizasri]

Can't believe I got rickrolled in 2024 😆touche CS50

[@GoldGlory7745]

I have a question to ask you. I am still learning as a beginner. So, I would like to ask you a question, in the real world require have to use VS code once they land a job as role as such a software engineer, computer programmer Data Science, or AI engineer? Let me know. Thank you!

[@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?

[@100drips]

all that memory management just began to make fun 😅

[@Samikshagupta425]

But why my speller file not work as malan how can i set up for dictionary and where I can get even my bridge bmp image is not open what can i do that's why I can't able to run my dictionary.py and edge.py can anyone give me what the solution of my hurdle

[@harshpareta-o6o]

Thanks

[@ЪыъЪуъ-ф2ж]

I only started to appreciate python after I started learning C

[@algirdasltu1389]

Same

[@algorhythms11]

No way he rickrolled all the students

[@willperry1147]

Blessed thank you

[@zsunnder2355]

Best Ending🤣🤣

[@tiagoantonio2343]

I LOVE PYTHON

[@bimbom9712]

saw that ending from a mile away lmfaooooooooo

[@rouassayah]

Good

[@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!!

[@wonkanese]

I can feel David Malan's energy

[@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

[@姚景曦]

Is there any difference between the cs50x_WEEK6 python course and the cs50p course？？？

[@divya_25_06]

Cs50 p is specifically for python ❤

[@AnasKhan-pg5dc]

wow, he just rickrolled everyone🤣🤣🤣

[@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`

[@이이이-g4f2y]

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

[@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.

[@ShahbazG]

problem set? 🤔

[@hsglator7135]

Hey guys, while watching this lecture, I just realized that there are problem sets that need to be done. And The problem is that I don't have access to a computer or laptop to complete them. I was wondering if anyone knows a way to do them using a mobile ? If you know, please guide me.

[@Zangetsu-gaTensho]

There was a compiler I used on android You can search up c compiler My problem is... Where are those problem sets? Can you help me

[@karateuma]

​@@Zangetsu-gaTenshoneed to access from website where the whole course is available

[@Aditya-pk8qv]

01:05:00

[@boks02_]

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

[@harisuresh2507]

im sold on python rn

[@FCAlex07]

We got rickrolled by Harvard University before GTA 6

[@KamalVerse]

The rickrolls never gonna give up on us😂

[@maianhvk]

Whew, this is a breeze compared to the previous 2 weeks.

[@kitgary]

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

[@arik2492]

We really did get a David J Malan rickroll before Gta 6

[@georgimmitev]

1:15:24

[@Serhii007]

Дякую!

[@airkh.]

the rickroll at the end lmaoo

[@kenyhu4759]

Good day

[@Zangetsu-gaTensho]

Damn this one has lost me I need to look up the weekly problem sets, cuz this feels like I am missing alot 😅

[@randomenia]

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

[@vincentkosmol9679]

2:04:00 Ahmm

[@krish-ut9de]

48:26

[@garrickmahochmannph]

Greatest rickroll 2024

[@jonnysegway7866]

I've been Rick Rolled! haha