Transforming Code into Beautiful, Idiomatic Python
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- čas přidán 9. 06. 2024
- Raymond Hettinger
Learn to take better advantage of Python's best features and improve existing code through a series of code transformations, "When you see this, do that instead."
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Note to Python 3 Users:
- izip is just zip
- d.iteritems() is just d.items()
- To use defaultdict: You have to do the following --> from collections import defaultdict
Rafeh Qazi thx for the additional info
Woah, did not notice my comment was sitting at 65 likes haha. I now have my own computer programming CZcams channel! Thanks for commenting Suburban and making me see this!
You are welcome. I will check out your channel as well! Cheers
Rafeh Qazi but in Python 2.7 zip is an iterator? izip,zip or range,xrange why not use iterator for everything and let the programmer choose if he want expand the list?
Javier I'm not sure if this is what you asked for, but you can use "list(range(x))" or "list(zip(x,y))", if you really want to have a list instead of an iterable object.
10:20 Beautiful syntax highlighting
Lol
I remember my prof for C++ and OOP had every other word/letter in his notes/code highlighted with no common theme whatsoever.
Man YT recommended it after 8 yrs
In search of gold I found diamond
This guy is seriously amazing, love his style of teaching
Pity his ego needs to be continuously stroked with applause.
John Cherry Oh FFS, it's a joke. First rule of becoming a Python programmer: have a sense of humor.
He reminds me a bit too much of a pastor for me to be completely comfortable, (like from a Pentecostal church or something). Or an unctuous salesman telling us about his schemes. Material was great, though.
@@johncherry108 It's one of his techniques to keep the audience engaged. He is an excellent speaker and he obviously does that on purpose. You might also notice that he asks the audience all the time if they learnt something new, or how many knew that, or what's the problem with this piece of code, etc..
On top of that, he makes me (and I assume other people, too) feel like we are part of the Python family; the core team seems close and approachable and I get a feeling of belonging to this line of developers who transformed the way we think about human programming forever.
No wonder why Python is awesome, they have awesome devs :)
"There's two kinds of people in the world: people who've mastered dictionaries and total goobers." - Raymond Hettinger
Isn’t there are correct?
I’ve been using Python for over a decade (informally trained) and haven’t learned so many great tidbits so quickly in a long time. Awesome talk!
"If you are mutating something while you are iterating over it, you are living in a state of sin and you deserve whatever happens to you" :D loled so hard on this one! 20:20
Hi I have recently started studying python, what is that arrow in print i,'-->',color?
@@Michael-jq1hl it's not a special character or something. he just wanted to print an arrow, that's it. the characters in single or double quotation marks are interpreted as string. so this statement prints 1 --> greens for example.
@@burakozdamar I see, many thanks, I never found the answer to that and now that I see the quotes makes more sense :)
@@Michael-jq1hl it's been a year, hope you are doing with python.
@@godfather7339 hey, kind of. I decided that instead of developing I could recruit Python Devs, so that is how I am using the little skill I have acquired.
Unfortunately, most Devs think I am like any other recruiter and ignore me xD
6 years old but still good advice. Raymond is a great teacher.
@@cirogarcia8958 10 years old, your statement of his statement still stands.
@@GroundZero_US almost 11 now
@@stijnvandensande3579 • and still holds up
The ignored() idiom exists in Python 3.4+ but is called suppress():
# NEW WAY in Python 3.4+:
from contextlib import suppress
with suppress(OSError):
os.remove('foo.txt')
Thanks! I was wondering why I couldn't find it
+
Amazing talk ! Probably best I've heard in all 26 year I'm coding. A handful of smiles and headful of HQ knowledge. Thank you, Raymond !
10 years old video, and it is gold.
Some minor differences, izip is just zip now i guess
At 44:00, The `with ignored(OSError)` has been renamed to `with suppress(OSError)` and is from the contextlib package.
I literally just watched this a second time for the entertainment value! Raymond Hettinger is hilarious! Not only was watching this a lot of fun, but super-informative and efficient.
I'm going to go check out some of his other talks. If I'm gonna learn python, it might as well be from this dude!
And how’s yours python 7 years later?
at 7:22 it should not
for i, color in enumerate(colors):
print i,'--->',color[i]
but
for i, color in enumerate(colors):
print i,'--->',color
may be printing mistake
I was here to write that. Nice catch.
I was about to make that comment. Either way works the same, but it's exactly what he's been telling us not to do, so clearly a mistake.
Also stopped the video to see if someone has pointed this out already)
Do you think that Raymond is reading these comments?
I think you do have to have the: print(i,'-->', color [i]) otherwise you will just get all the colours beside each index in a row repeated 4 times. Unless this is just in Python 3?
Documented version gist.github.com/JeffPaine/6213790
gratzi
hero, that is you
I wish this guy was my teacher
+snowblindu he's cocky and not interesting at all
+hd ggoyo pffft, hater. I wish he was my teacher too!
+hd ggoyo He added a lot of the cool stuff to Python so he gets to be cocky.
+riDDimann i was just joking, he looks like a cool dude, chill guys
He is cocky, but he knows his shit. If you are going to be a hater, prove your chops.
This dude is off the hook smart.
This video was the video that got me interested in writing ideomatic Python and iterators. I've revisited it now and then ever since 1. year at uni. Amazing lecturer.
Love this guy. I was quite disappointed when it ended. I was so expecting a much much longer video :D
You could read the "What's New" articles instead: docs.python.org/3/whatsnew/index.html
@@ceestimmerman9785 it's not quite the same!
This presentation is simply awesome !! hands down !!
This is a must see video for an python developer. Fantastic!
Found this to be one of the most useful python talks thus yet on youtube.
I can listen to Mr Hettinger all the time!!!
Thanks for the presentation and your contributions.
Dude’s kind of a colossal badass. Not even mad at the Casey Kasem vibe at all. He’s a beast.
This man is technically brilliant and hilarious. Not something you see everyday. Thanks for the nice speech!!
I thoroughly enjoyed your presentation! Take the old-fashioned, ugly, slow way of doing things and instead do the new-fangled, beautiful, fast way. I love it!
Where have I been All this time only to find this GEM right now ??? This video is very great and a MUST WATCH for any pythonista
This is probably the best presented programming video I've ever seen. Thanks!
Just one video and learned more things worth years... great tips!
Raymond's an entertaining, engaging presenter. Good mix of material here, definitely came away richer for the experience.
this is why i love python, the ways to write clean code.
First - this is an awesome piece, I didn't knew Raymond Hettinger was to be blamed for so many iterators in python, and I truthfully love this guy now that I know what he did for most of my days! :)
There is a small bug in 15:58 onwards due to the missing tgt variable, but the more important thing is that it can get even more beautiful (IMHO) from:
def find(seq, target):
for i, value in enumerate(seq):
if value == target:
break
else:
return -1
return i
to this:
def find(seq, target):
for i, value in enumerate(seq):
if value == target:
return i
return -1
not that the for/else is not nice in some other cases, this was probably just not the right example for it.
What amazing techniques! Why I haven't seen this sooner. Thank you a lots
That talk was amazing. Will need to watch this video a few times.
"Start open source contributions to project by going in and placing doc strings". This is a brilliant idea! I've wanted to start contributing for so long but didn't feel I have the skills, I'm gonna do this!!!
Yes, do it. There's a lot of extremely crappy documentation for Python modules :q
I m watching 7 years old video and leaning lots of amazing things.... :-) you are really great.
Thank you so much for this wonderful lecture. I think this insight might be helpful . As a Novice programer I had a few issues understanding how some of core functions in Python worked and what was because the people who taught me where using derived language examples. Phrases like "if you've code an another language....". But I haven't well time passed I learned the hard way later got to this video and inevitably think that things would been a lot easier for me if this lecture was around.
this may be the best python video I've seen online
Yeah, there should be a video like this one for every language out there.
One can learn much more about how to write clean code from such videos than from any crappy tutorial.
Really insightful video. Didn't even notice the time fly by. Already feel better as a Python programmer.
Thank you for the lecture, sir. I appreciate the review of some critical "dos and don'ts" for beginners.
Very nice. In just 50 minutes I learned moe then in the last month.
Amazing stuff! Love the functional style entering Python
Initially I refuse to believe any developer wouldn’t know what “in” semantically means, but then I’m reminded of all the code I’ve seen.
Most programmers nowadays have just learnt to parrot other people's code without any actual in-depth understanding of what it does or why is its syntax the way it is. Mostly "thanks to" online tutorials, like those on Udemy or alike where blind lead the blind :q I still have people giving me weird looks when I write C++ code like this:
if (a == b) do_something();
else do_something_else();
instead of wrapping the functions into braces, because they think that those braces are part of the syntaxt and have to be there. Or if I write something like this:
cout
probably best python video ive ever seen
Wow - amazing talk - informative, concise, immediately useful. Thank you.
In python you make your video with audience, clapping, laughing and commenting. Python is fantastic.
Love Raymond's presentation style.
Yes! It's very entertaining.
Thanks a lot for this video. Raymond is an awesome guy.
This is priceless! Thanks for the upload.
I'm so glad that he said we should rename For as ForEach. I suggested that online some years ago, and boy did I get lambasted by everybody!
great lesson and great presenting style!!
I kept smiling. Thank you.
Such a great video! Many thanks!
Excellent presentation on Python code writing.
Amazing video - thank you so much!
Man, this is awesome.
This lecture is very nice to learn advanced Python programming. After I watched this video, I realize that I have used Python almost like using C. I have used C and C++ as well as Matlab. Hence, I thought that many approaches in Python will be not much different from the conventional languages except specialized keywords. However, I realize that grammars in Python can be different from that in C.
So this man made enumerate()? I love him from now on!
this guy is really helpful. BLESS
Amazing video, really good video and tips, thanks
I think that 'return newfunc(*args)' on line 6 must be replaced by 'return saved[args]' at 41:12
yep. infinite loop
@@lucasfcnunes Stack overflow ;-)
Great presentation!
Amazing Slideshow
great video. thank you
He even said I would fight him on this, but haha, oh man, the comparison functions are something I absolutely *miss*, even if I really agree with almost everything else he said and have been writing idiomatic Python for ages. I ran into a real problem the other day where comparisons were a much cleaner solution than the less obvious and potentially much slower multi-pass sorting: Sorting on multiple keys with independent ascending or descending orders.
You can sort a plain tuple without any fuss if you don't mind that every key is ascending or every key is descending. But if you want to mix those, you have to do it in multiple passes, starting from the least significant key to the most significant key, and rely on timsort's stability to get the job done -- or, IMO, cleaner -- if this were Python 2, I could have expressed the comparison function with appropriate ascending/descending signs in a simple if/elif/else return 0 chain, and rapidly expressed both the intent and the functional result quickly.
Python 3 even provides a conversion utility that creates wrapper objects on the fly to facilitate this need, which is a bizarrely convoluted way to accomplish what simply allowing either key function or comparison function would have.
Man even though this is not quite as relevant to me today, I really love his presentation style
This guy is a legend
This was amazing!
I love the people who make Python! Thanks for this most enlightening talk.
are you a python ninja by now?
@@wasikhan7741 I sure am 😏
brilliant talk, thanks for sharing!
Very good video, helps writing efficient and clean Python!
Great Presentation.
Many thanks! It is still useful for me!
I learned a LOT with this video, Kudos Raymond Hettinger
15:52 for/else, I've always wanted this. For a long time now, I've replicated this behavior in Java enclosing the for inside try/catch and throwing a custom exception of the kind 'BrokenLoop', which looks waaay better, despite feeling forced and inappropriate. Huge like.
I love this man! He should write a book on clean Python code, if he hasn't already.
Most enlightening talk
Note that these functional constructs are now in every mainstream language such as C# and Java. So, it's not that Python has a specific capability, but experienced Python programmers do encourage the use functional constructs. This video is an example.
There's an error on the slide at 7:13 titled 'Looping over a collection and indices'. Last line should be:
print i, '-->', color
Bill Tubbs both have the same meaning brother be it color or colors [i]
Both have the same result but using the color iterator that enumerate creates is 'faster and beautiful' as he points out.
Can't recommend this talk enough. Must watch to take your python chops to the next level.
"with ignored(OSError)". So cool. TIL. In Python 3, it is called "with suppress(...)". You can list multiple exception types too.
43:47 "ignored" is now called "suppress" and it's part of "contextlib" library.
Great speech!
What a great lecture :D
This is great! I have a *much* better understanding of iterators and their purpose now. Thanks, Mr. Hettinger.
edit: How did I not know about dictionary comprehensions?!? (21:05) That is AWESOME!!
idk, kinda standard stuff in CS
Amazing talk..more professors like him. :) I'm starting to appreciate Python now.
EDIT: Wow
This needs updated for Python 3 - I have to go hunting for which of his recommendations are still valid. The video could at least have footnotes that say which still applies in Py3.
I come back to this every few years. 😅
OMG... I have been doing hacks in python for loops trying to do what enumerate does... THANK YOU!!!
Give this man a Python Salute!
Superb content. I learn a lot. :)
At 7:26, it should be
for i, color in enumerate(colors):
print i, '-->', color
Hi I have recently started studying python, what is that arrow in print i,'-->',color?
Michael the arrow is a string
I love this guy
41:16 it should be "return saved[args]" instead of "return newfunc(*args)"
Unbelievably awesome talk!
40:26 that one guy is really enjoying it:)
pretty good, thank you
very much required for a beginner like and why would someone dislike this ....
Maybe they code in C ;)
Just stumbled across your video mate, really love the content. Liked straight away, We should connect!
"I don't tweet when I arrived at an airport...or anything like that" I guess things change , because this is his most recent tweet: twitter.com/raymondh/status/797267421568634880
27:50 I think doing this is so common, there should be a group_by(sequence, keyfunc). You could then call it with group_by(names, len). There should also be an index_by(sequence, keyfunc). These functions would be trivial to implement, but nevertheless they are common and useful enough to be put in some standard lib (collections?).