All 39 Python Keywords Explained

[@sunsodien]

Thanks!

[@Indently]

Thank you :)

[@cerealport2726]

I think you're much too harsh on bob at 9:45. bob has helped in so much of my coding. Always been there at the frontlines, takes any assignment I hand out, and successfully completes tasks, or faithfully reports errors encountered. Justice for bob!

[@EpicNoobx]

So true

[@drforest]

bob is _

[@TidalMaker]

Bob helped me with my flat tire. I was on my way to a coding interview. I wouldn't have gotten the job without him.

[@Farfromfuture]

I use Alex Smith in everything

[@hunterbshindi2310]

Yeah, he just cured my ovarian cancer

[@cyberhard]

Excellent video. Thanks for sharing your knowledge!

[@WinfriedKastner]

Python in 34 minutes. Incredible!! And perfectly explained as always 👍

[@miquelr2353]

I got lost at the asyncio part. The 7th keyword lol

[@AJMansfield1]

4:07 you also use "as" with "except" to assign the exception to a variable

[@tgsvampire]

Is this kind of use of 'as' keyword relevant in the industry ?

[@AJMansfield1]

@@tgsvampire except/as is perhaps even more common in real code than with/as

[@godowskygodowsky1155]

​@tgsvampire When you're working with large systems, logging errors is a must. You need the "as" keyword to pass exceptions to a logger.

[@tongpoo8985]

​@@tgsvampireyes, used all the time.

[@verysb]

Some complement: A and B -> (B if A else A) A or B -> (A if A else B) bool(0) -> False bool(“”)-> False bool([])-> False bool(None)-> False bool(“ “)-> True code after else that after while, for, try except will only be executed when the loop or the try is finish normally (not normal: break, error)

[@Keventor]

33:12 type type = int | float match: type = 10 case: type = 10.0 match match: case case: print(f"types {type} are the same because case {case} matches {match}")

[@cuicuidev]

You can also use the from keyword to yield from an iterator: yield from iterator

[@marckiezeender]

And you can use "from" to raise an exception from a context. I.e., raise Exception() from None

[@anthonydrakefordshadow]

Thank you I really am beginning to appreciate material that is more focused on thinking, and Python. I’ve learned a lot from tutorials, but for the most part, I am only able to apply what I have copied and limited situation versus having an understanding and being able to create.

[@simonwillover4175]

Built-in constants: * `False` * `None` * `True` Built-in functions: * `assert` * assert is simply a built-in function that doesn't require parenthesis; you could write your own function, `my_assert`, that does the same thing * `type` * unlike `assert`, you can override `type` Imports: * `import` * `from` - must be followed by `import` * `as` - must be proceeded by `import` or `with` Declarations: * `class` * `def` * `async` - must be followed by `def` * `del` * Scope changes: * `global` * `nonlocal` Logical operators: * Unary: * `not` * Binary: * `and` * `in` * `is` * `or` * Ternary: * `if` and `else` - must be used together, like this: * `(when_true) if (condition) else (when_false)` Expression: * `lambda` * allows you to make a 1-line function that returns the value on the line without declaring the function * very Control: * `pass` * actually does nothing * typically used to put an empty body in a control block, function, or class * Logic * `if` * `else` * `elif` * Loops: * `for` * `while` * `continue` * `break` * Error handling: * `try` * `except` - must be proceeded by `try` * `finally` - must be proceeded by `try` or `except` * `raise` * Functions: * `return` * `yield` * makes the function return a generator, even if the code around `yield` is not accessible * this items in this generator are all of the values of each `yield` statement * if the function hits a `return` statement, the generator will stop / finish and ignore the rest of the function; further attempts to generate items from the generator will fail because it is finished and the GC might have deleted the function call stack that the generator used * Async: * `await` Switch statenements: * `case` * `match` Bad * `with` * `with A as B: C` does this: * run `A` * set `B =` return value of `A` * run `B.__enter__()` * try to run `C` * if an exception occurs, run `B.__exit__(self, exception_type, exception_val, trace)` Doesn't do anything and is not a constant * `_` * essentially not a keyword

[@tgsvampire]

Hey ? Are you a pro ?

[@tgsvampire]

What is this global and local scope ? ls it like, the local scope variable is something that can be directly accessed by only the function in which it is defined ?

[@tgsvampire]

This is one of the most underrated comment I bet...🧠🔥

[@tgsvampire]

What is this lamda ? I have seen this many times but I am confused about this one.

[@simonwillover4175]

@@tgsvampire I am not really a pro. I am an enthusiastic programmer with only a few years of hobby experience. I could get a job as a junior dev if I wanted to though. I read your other comments and it looks like you want to learn python. I suggest you learn more python. My comment only makes sense to people without about a year of programming under their belt.

[@Celemimphar]

I have never heard of several of these despite taking a few Python courses... I am intrigued

[@callbettersaul]

"despite" is the wrong word here.

[@stephenEs3532]

@@callbettersaul its not English class. Hush your mouth

[@Icthi]

Let’s suppose it’s English class for a sec. What do you suppose is wrong with this use of “despite”?

[@TearsOfTheKingdomIsGreatToo]

it is correct ​@@callbettersaul

[@prof.anthoniraj]

Great way of explaination about Python Keywords. Keep it up.

[@ImportCode]

I'm I the only one finding this video funny. Very comprehensive video. I love it.😅

[@rakibmasud3288]

Really appreciate your effort. More videos like this please!!!

[@PCgmesforever]

Why is it that all programming teachers I know are calmest most chill and nice people yet they casually drop the darkest type of humour or life truths :D

[@jefflastofka9289]

That's a really great review to see which ones I know and which ones I should look into soon or ignore for a while longer. Thank you so much for putting all that together.

[@avrelyy]

great explanation of each keyword. Thanks!

[@datanasov]

At 33:33 you can't do that. Doing "case case:" will match any number (not just 10) and put it in the variable case. I think that's why your editor is underlining it.

[@Indently]

Well spotted, and noted! I clearly didn't do enough research on that because it was a "case" I thought I'd never even dare to attempt. I appreciate you pointing it out :)

[@flaminggasolineinthedarkne4]

Really nice video with the explanations about built in keywords in python. I appriciate your efford.

[@zayyabhone]

this was very informational, thank you for the insight

[@chriscarney2260]

27:25 great video. Point of house keeping.. there are 2 While keywords in the info list. 2nd should be With.. Still a great video;-)

[@Indently]

Thank you! I updated it :)

[@ЮрийБ-о6е]

Amazing video, thx. Waiting for combination of them :) Once, I was really confused by `yield from`

[@yidisprei100]

The 'in' keyword is in the thumbnail twice. Amazing content btw.

[@Indently]

Good eye! My friend spotted that a couple days ago while the video was private, and I was wondering how many other people would notice.

[@alejandroherme9497]

Some useful details: ( Better to write this down before I forget something ) "and"/"or" : because of the short circuit system, these can return any object (non booleans). "None": while these represent the absence of a value (like null in other languages), it doesn't mean that every non declared name equals None. It's more of a special value that any object can take. (btw if we use types, by default it's incorrect to assign None). Also we must be careful when writing "assert x" or "if x:" when we want to check for None , because if x is equal to False, it will act as if it is None. This depends on the __bool__ method of the object in question. Asserts: I've read that they only work if __debug__ is True, so I'm instead using "if x: raise Exception". "del": a non recommended keyword. Its behavior depends on the object involved. If it's a list item, del will remove it from lists. "pass": avoid filling placeholders with pass, since you won't be able to differentiate what is supposed to do nothing (for example, an abstract method) and what has its implementation pending. I prefer to "raise NotImplementedError()"

[@marckiezeender]

Just to add about 'pass': I use pass to denote "this block of code does nothing", I use raise NotImplementedError to denote "this block is missing its implementation", and I use ... to denote "this block of code is abstract" (i.e. for a stub file, Protocol method, or abstract method; note that you can't create instances of abstract classes.)

[@max_unch]

Thank you for all the excelente work! Great video 👌🏼

[@denoww9261]

Great video! Btw, at 33:33, technically `case case` doesn't work as you'd expect - the way case statements work, a single variable name after the keyword is actually assigning a variable to the value of the match statement (in this case, the `match` variable). So here you'd have a shadowed `case` variable inside your case block with whatever value was in the `match` variable.

[@leftsidemartian9839]

can someone explain the variable declaration at 5:31 please 🙏

[@owtechS]

This variable declaration db: str | None = "myd.db" is using type hints, which are annotations used in Python to indicate the expected types of variables. Let me break it down for you: db: This is the name of the variable. :: This indicates that what follows is the type annotation for the variable. str | None: This part indicates that the variable db can hold either a string (str) or None. = "myd.db": This part initializes the variable db with the value "myd.db". Here, "myd.db" is a string, which satisfies the first part of the type hint (str).

[@velo412velo]

Amazing job buddy. Thank you very much for all your hard work! You are amazing and I am defo gonna buy one of your paid tutorials.

[@Lolks]

My first encounter of the None keyword, was on my Python Midterm, when we had to figure out the output of code snippets, and one of the questions was print(print("Hello, World!")

[@elymX]

Would be nice if you do the same thing for SQL so we can have 1 stop shop as reference.

[@Radical9535]

Really good Video!

[@lucasmandato4910]

dude this is amazing thank you so much

[@Technology_AmaAkar]

Thank you for sharing

[@rainymatch]

lovely vid, as for if/else, I would have been happy to see also the ternary expression 🙂 ``` if else ```

[@xandii4694]

should have mentioned using only 'throw' in an 'except' block to rethrow and maybe how to use underscore for "private" methods. Apart from that great video 👍

[@caymanm7241]

What do the "|"s do when declaring a variable? I'm assuming it's similar to type hints.

[@TheImmortalKingCeaser]

Awesome work.

[@alansnyder8448]

Really good video. I've learned a few things. 'match' with a tuple was completely unknown to me before this video. I've seen '_' used, but now understand it. Can someone tell me when the '_' became a feature? If I use it in Python 3.8 will it cause a problem?

[@Snollygoster-]

I actually saw the nonlocal in a script at work, it functioned how I thought, but seeing it then just made me wonder why it's even there. It looked like they were just trying to add more lines of code.

[@sovereignlivingsoul]

very classy Class explanation, lol, fast forward ahead, when you read the text from the file, can you go to a specific line and input data,

[@Johann75]

Cool lesson

[@mixme8655]

Thank you sir❤

[@watchmakerful]

Wow, finally a language where a switch construction does not require "break" after each case!

[@axiezimmah]

That's a downside imo. Fallthrough isn't possible in python even if you wanted it to. Which limits the use cases.

[@I3ased]

9:15 im so confused to why he has none in all these are they doing something?

[@olivergrim7634]

None there means what they return by default they return None (__init__ ALWAYS returns None) ex.: def myfunc() -> int: this *hints* that the function returns an integer returning works with the return keyword and replace the call of function in code with that the function returns returning is when we want information from the function

[@I3ased]

@@olivergrim7634 thank you for replying i understand now 🙏🙏

[@ashutoshsinha9848]

Can you suggest good resource to learn asynchronous programming with python? or better make a detailed video.

[@Jan_Be]

Could you upload the examples as python files? Thank you!

[@joshix833]

What about the other uses of else? Like for ... else, while ... else, try ... except ... else?

[@effanineffables]

was looking for this comment before I said the same thing! else is so much more than just if..else

[@abdomash_]

32:36 Wow, TypeScri-... I mean Python is a really nice language!

[@replikvltyoutube3727]

Is it possible to overwrite these keywords, like translate them for instance (even if it is bad practice)?

[@Indently]

With soft keywords you can assign new values to them, but with the built-in ones you would have to change the implementation of Python itself from what I understand. I once created a script that translated my own keywords into Python code, but it was silly and just for fun.

[@НиколайКузьмин-с4р]

Seems like keyword number 34 at 27:21 should be with and not while

[@Indently]

Thank you, it has been fixed!

[@CLOCK-WORK]

Hiw do you get and install the python you have?

[@DrDeuteron]

Now this is a separate video on coroutines. yield is not just a 'return' statement. It is also an assignment statement. If in a generator called 'foo', you have: new_value = yield old_value a user, baz, of that generator that has declared: def baz.. bar = foo() can then do: current_result = bar.send(my_value) which gets bars's old_value and stores it locally in baz's current_result while at the same time storing baz's my_value in bar's new_value. bar then waits there until anyone calls next(bar). at which point foo's code restarts execution. confused? good, so am I. But I have used these to write a text "continued line" unwrapper, and a clever spacecraft data packet reader in which the length of the packet is not known until the end of sensor scan--with NO, ZERO, NADA if-then clauses. Cyclic Complexity = 1, but it handles all cases WITHOUT indexing past/present data streams, even though the data reading depends on the values of the data stream at different timestamps (read: indices).

[@JMCiller]

What are the differences between try/except(raising an exception) and assert?

[@marckiezeender]

assert only works in debug mode, for one. It's basically shorthand for: if __debug__ and : raise AssertionError()

[@falkez1514]

also, assert is specifically a bool check, try is made to be ready for any type of circumstance!

[@Heavy_Lvy]

got to be my favorite keyword 10:27

[@yvg2009]

Can I create my own keyword like True? E.g. Pi = 3.14159? Directly in C files?

[@llnobbi7ll]

Great vid

[@locust76]

I don't think I will ever be able to understand how lambda works. I use it in several of my projects to sort lists of dictionaries by keys, but how or why it works is anybody's guess.

[@owtechS]

Am with you on this one. But it is somehow important

[@moho472]

Lambdas are useful if you just want to do something like a deepcopy, or modifying data, without having to define a function. They're single use, and make your code cleaner.

[@shailumishra-y3n]

How many keywords in python latest version 3.12.0 35 or 39 please Riply any one🙏

[@marykatherine4080]

Is this done in visual code studio plz reply

[@olivergrim7634]

idk what that is, it looks like pycharm, both vs code and pycharm are good, pycharm is python specific

[@moho472]

​@@olivergrim7634Visual Studio Code is another IDE, made by Microsoft.

[@frozendude707]

yup, PyCharm on Mac

[@markandrews1219]

What is the IDE in this demonstration?

[@muralidharreddychalla3877]

pycharm

[@АлексМихайлов-ч6э]

Finaly some insight

[@legionarius-z7x]

Nice video

[@callbettersaul]

Something happened with 3rd chapter name ("None02:34 True")

[@Indently]

Thank you for pointing that out, I fixed it!

[@anandraj2895]

informative thanks

[@jacobmmcdonald]

Assert should only be used for debugging. If the optimization flag is used and _ _debug_ _ is set to false, assert statements are not evaluated.

[@falkez1514]

poor bob got so abused today, he even wrote a letter to indently through the .txt but no one cares...

[@Cryptohustlerhub]

Sorry bob

[@JohnBerry-q1h]

Which software developers’ implementation of PYTHON are the most reliable and least “buggy” ?

[@Slipping_thru_the_Seams]

thank you!

[@anon_y_mousse]

Apparently Python 3.9 doesn't have a soft keyword list, so I think I need to update. What's really weird is that my keyword list has __peg_parser__ in it and I have no clue what that does.

[@sayanta01]

thanks you so much

[@MadMan-369]

Thanks ❤❤❤❤

[@lhuguenin100]

Can we please just agree that it’s insane for true and false to be capitalized???

[@ゾカリクゾ]

It's a bit weird yes, but at least True and False somewhat indicate that they are objects, not simple 1's and 0's like in other languages.

[@alansnyder8448]

I'm actually okay with it capitalized, along with None. It makes it stand out in code.

[@matthewsharp1178]

I’m fine with it

[@lhuguenin100]

I really thought I would get more support with this one hahah @@ゾカリクゾ that’s because in most languages they aren’t actually objects, they are just masks or macros for 1 and 0, which is more memory efficient. But in python everything is an object, there are no true types, which can be good for other reasons.

[@itexpert4193]

good one

[@chrisder1814]

hello could I write to you so that you can tell me what I think of the ideas I had

[@joshix833]

What about "async for" and "async with"?

[@TheNameIsAQUILA]

Justice for bob

[@mikeogadono4196]

I started learning coding today .guys I need your support

[@kbcat]

why do you declare types

[@olivergrim7634]

to make it more readable

[@xjustinjx]

wonder what this sounds like in a few years, at 2x. 35, never programmed, 30k? 40k? hours on the computer playing games. completing my first college programming class right now, currently have 100% going into finals. programming is fun.

[@kapibara2440]

Good job! Bravo 😊

[@dougiefresh2393]

Nicley done

[@Macro-Mark]

Great video. But why give Bob such a hard time 😂

[@travisti9574]

3:50

[@vryyx_6969]

9:25 facts

[@Lighter7900music]

Python has 39 keywords and not one const keyword.

[@-Quran_kreem]

Don't change the variable and it will not change.!!

[@Lighter7900music]

@@-Quran_kreem You're making a fool of yourself don't you think?

[@cycrothelargeplanet]

Just use allcaps to tell people it's a constant and hope they don't change it

[@Lighter7900music]

@@cycrothelargeplanet *Hope*

[@Nbrother1234]

Use all caps for constants

[@mr_hat5506]

JUSTICE FOR BOB!

[@user-lg4le8xr4s]

We do not say hello to Bob.

[@MrSunTrope]

Notimpemented?

[@lmg88.80]

Thanks for the list. It is a clear explaination but you speak fast, maybe because you took a long time to film and by that time its understandable that you want to finish the video by speaking fast.

[@thefanboy3285]

The first example is me: has_money: bool = False

[@Kabukkafa]

Two "in"s in the thumbnail

[@FroggyThicc]

0:00

[@TheManPrtagnst]

If anyone sees this im trying to make python have a conversion and can say different things depending on what you say. I would like some help

[@dan5e3s6ares]

[@deepdark242]

All what person can do is work, because life is misarable ;d 9:25

[@StrandgaardMorten]

Liked. Subscribed

[@rohitlearnscode]

You explain well but the sequence of Keywords isn't right. You might want to consider re-uploading the video and sequencing the keywords from beginner level to advanced level rather than alphabetically.

[@faelynOlayu]

9:24 lol real

[@robertpearson8546]

This reinforces my view that Python is just tarted up C. False is NOT 0.

[@moho472]

Python's interpreter, and the language itself, is built off C. You can actually read the C code that makes the Python Language.

[@robertpearson8546]

@@moho472 They did alter the C code to play-pretend that they are doing functional programming and play-pretend they are doing object-oriented programming.

[@peaklegacy146]

Poor Bob 😔😔