Generators in Python || Python Tutorial || Learn Python Programming
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- Опубликовано: 28 сен 2024
- 𝙎𝙩𝙖𝙮 𝙞𝙣 𝙩𝙝𝙚 𝙡𝙤𝙤𝙥 𝙄𝙉𝙁𝙄𝙉𝙄𝙏𝙀𝙇𝙔: snu.socratica.... Learn how to use generators in Python. We'll cover two types: Generator Functions and Generator Expressions. Generator functions use the "yield" keyword, while generator expressions look like a "tuple comprehension." Generators are a powerful and efficient tool for use when looping over large amounts of data.
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#Python #Generators #Coding
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To speed up the prime generator, don't add 2 to cache, because all numbers tested are odd and therefore compare false. In the inner loop between line 13 and 14, break if n < p*p - this will have the biggest speedup, because it will only check up to the sqrt of n. So 3 would be added without checks, 5 through 9 will only compare against the number 3. 11 through 25 only using numbers 3 and 5. Etc. vs using all of the numbers in the cache to find each new prime.
FINALLY! Another python tutorial
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Never was so much owed by so many to so few for so short but so informative videos.
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Those python videos and their slightly different approach are always crystal clear and interesting. Thank you very much for your work!
that patreon addition was real smoooth!
very infomative nonetheless. did expect yield with somewhere cause i stagger there
Shit since I started python i've never understood generators like this, it's amazing that we have Socratica to be honest thank you so freaking much
best artificial intelligence visualization in the world.
Thanks for the tutorial )
I had never considered generating generators, but if I generate any ideas I will iterate until I return a tractable solution. Thanks for the video. I appreciate the ones that are aimed higher than beginner level!
It seems some knowledge was generated in my head :)
I really enjoy the way these are presented. Clear and informative too.
Good to see "Ulka Mohanty", the robotic actor
willing to admit Ulka is half the reason I watch these...
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Generators in Python
generating interest.
The amount of education in Socratica's videos
Is indeed intense.
Expense
-s seem,
Like what they have a lot.
Let's help them out
And give it a thought.
Bot,
Is what they're not using.
Care,
Is what they give.
If they kept making videos till the end of time,
Then knowledge would always live!
I wanted this video like a month ago! Great job and a bunch of thanks!
I love the production process. I love you
A small optimization for the generation of prime numbers: instead of storing the found ones in a list, you could put them in a set.
I’m curious, why would this improve performance?
@@stuarthys9879 It is much quicker to look up a member in a set than in a list.
That's only if you're looking for the presence of one specific item. All found primes need to be checked anyways to verify the current number, so it wouldn't matter in this case.
@@Daniel_WR_Hart Yes, you're right!
I'm pretty new to python and I'm trying to learn more about the language. This video was super well done and easy to understand, and I learned exactly what I wanted to. Also that circuit board dress is so cool!
How to speed up:
1. Don't put 2 into the cache, because iterating 3 by 2 never results in an even number
2. Use the fact that all prime numbers greater than 3 are congruent to 1 or 5 mod 6 (you can massively speed up)
3. Only iterate up to square root of (n) when checking for primeness
This will give you a massive speedup.
Can you please explain point number 2 and 3.
@@hackerxxspacex6935
Of course.
Ad 2):
All prime numbers > 3 are either 6k+1 or 6k-1 where k is a natural number.
Examplea:
7 = 6 * 1 + 1
11 = 6 * 2 - 1
It's important though that of course not all numbers of one of those forms are prime, but you can exclude a large portion of the natural numbers from the division (actually: modulo) testing. I also use this to unroll my loop when I need a quick and dirty prime number test, because I do loop = loop + 6 and then the two divisions (sieving only requires prime numbers as divisors).
Saying they are congruent to either 1 or 5 mod 6 is the same sentence, just shorter.
Oh, and also I do a preliminary check if n mod 6 is either 1 or 5 to weed out many n before even starting to loop. Thats helpful, too.
Ad 3):
If you want to test n for primeness you only need to do division testing up to the square root of n (sqrt(n)) because sqrt(n) * sqrt(n) is already n.
seriously these videos are on another level..
To answer the question weighing on everyone's mind, it is possible to create a generator that generates generators:
import itertools
def gens():
yield itertools.count(1, 5)
yield itertools.count(10, 3)
yield itertools.count(20, 2)
for gen in gens():
for x in gen:
print(x)
if x > 30:
break
Thank You AI Teacher... Now iam Confident enough in dealing with python generator 😃❤
Why do you call close() method instead using break in order to stop the for loop?
Love and learnt so much from your videos,
Want videos on Multithreading, multiprocessing, Class and static methods, public private and protected methods, super keyword.
Got a bit late, was so tired lately
How's Socratica💝
I always love this series!
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I would like to compliment the presenter, thank you.
This is actually impressive
Learning a lot from you folks. Thank you.
I am very happy to see you again with another amazing video. thank you very much
Another great python tutorial. You should develop another way to accept financial support. I know someone is taking a big cut somewhere and I'd rather not give them anymore right now.
I'd like to see an Assembly Tutorial from this channel!
What is Assembly used for these days? I thought C replaced Assembly
@@theblindprogrammer It can be used for a lot of things, especially when you are designing your own ISA...
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This is gold!
this footage is awesome
welcome back !!
waiting for more python tutos...
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Hello to our Socratica Friends in Myanmar!! 💜🦉
Seems like magic to me
LOVE YOUR WORK!!!
another awesome!
Thanks for the video, it is great!
Yes, it is possible to generate generators that generate generators.
This is fantastic!
Is there a video on args and **kwargs
Hmm maybe Socratica is the generator of all generators...not sure though cant fit the entire list in my memory😁
Great video!
very nice!
I love this channel
the prime_number program is not for prime numbers but odd number, there is no code here checking for prime number
Python Videos are back ! 😍
please please make a js tutorial u r the best
What is the name of background music ?
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I joined this channel primarily to watch your Python videos. They are relaxing and stimulating simultaneously. After 20 years as a software engineer, it is quite unexpected !
For each video()
Smile = Smile + 100
Next
Print(Smile)
3700. #my face hurts ! Thank you! ….. my I have another please ?
If answer = “Not now or in any other space in time”
Then 😢😭
Else 🖖🏼
Thanks
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I was there !
All prime numbers> 3 can be written as 6n +/- 1.
n = 4 doesn't work (25 is not prime)
@@markk4203 I did not say that it works for all n.
Socratica's favorite Python one liners?
Generate a generator, that generates generators… sounds like a Von Neumann probe (aka self-replicating spacecraft).
So what are the cons of generators?
Generators make DC, whereas alternators make AC; making it easier to step-up or step-down voltages.
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Or do I?
I haven't started this playlist. I'm kinda scared of python now.
Don't worry about it. Start from the beginning and the mist will lift. Just always make some small project that lets you use the concepts in the video practically.
Don't be. Socratica makes it simple if you start with the first video in the series. You can do it and it will only take a few hours to get through all the videos.
I want to write a program that will intuit all of my programming needs and write the code for me.
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So much editing
are you human or Ai ? i have been wondering
900th Like!!
They're everywhere.
These videos are absolutely brilliant.I like the format, short easily digestible videos on a very specific feature of python.
Thanks!
Thank you for your kind support! Köszönöm!
I've been watching your videos for about 5 years now and I just want to let you know that I now have a great full-time job as a consultant and am invaluable to my team thanks to my ability to code, which in part is thanks to you!
I got a question. I got an unusual tech Stack and don't know what position I should be submitting to. I know how to code in python mainly scraping, organizing data, sending API requests, formatting texts. I also know SEO, copywriting, creating websites and also 3D modelisation and motion graphics. I'm good at all what I mentioned.
@@skwerone Hi,
You're currently in the same path that I am.. Just saying.
We are searching the same things ( Probably more people than we think are trying )
I'm now speaking Python, and wish to find people to speak with.
If you want, respond me back, I use selenium with tkinter GUI strap in a beautiful OOP structure,
You'll understand.
Kindly, Guillaume. ( William )
@@skwerone can't anyone tell you what to do. Learn who you are and what you love to do then research multiple roles. I can cook but that doesn't mean I want to be a chef.
The prime generator will be way more efficient, if you only check until the square root of n is reached.
yeah, that would be a big speed up. Also (this wont really have any effect) you don't need 2 in the prime_cache as every number you are testing is odd
This was covered in an earlier video in the series.
A similar Haskell tutorial would be both a challenge for Socratica and a valuable source of knowledge for those who want to learn the language.
No programing tutorial channel has such well written and engaging videos.
Your videos really are the best - I have watched them over and over again as they are as entertaining as they are educative. Really really learned a lot. Thank you thank you for all the work you put into creating this masterpiece (officially my favorite videos on coding hands down!)
One quick ask, if you'll indulge me - could you possibly make something on Linked Lists, Binary Trees (in that order). Seen so much content on these but I bet hearing it from you would make it that much easier to digest/understand. Looking forward to this.
ME: Another great lesson, what can you say about this?
PYTHON: Hissssssss!
How did a python turn into a hydra? Generators!
“is_prime” in code could be replaced by a for-else statement
I'm not a noob in programming, but i was strugle to understand yield in functions. Thanks to you all is clear now!
This is wonderful to read, thank you for telling us! 💜🦉
It's odd isn't it, with programming someone will say the right words or use the right analogy for it to make sense. That table Tennis analogy is great!
Always great tutorials from this channel. Really appreciated
Generator of a generator?
Mmm it sounds redundant.
So happy I found your channel. Great video...I like your approach to teaching and how you break things down and provide several examples. The information provided has greatly improved my understanding!
I've known Socratica with the excellent abstract algebra videos, glad to see that the Python series is just as good!
The most important thing Ilearned in this video is how 'yield' is properly pronounced
this is the best video I've watched about generators! such an important but somehow slippery concept to explain
I recently found out about the "yield from" expression. You can use it to create generators with a recursive definition.
Awesome and helpful video! Great work 🥰
Instead of using a sentinel value in the inner for loop of the prime generator, you can use the `for ... else` construction. It's relatively unknown but it's perfect for this
maybe instead of looping over the primes in primecache you can define a variable fact=2 before the first loop, that will contain (n-1)! Than to check if n is prime we check weather (fact+1)%n==0, and to get the next factorial we need to multiply fact by n(n+1).
My video buffered at 6:29 which was where the generator was created and run without an exit condition so I thought the buffering was a meme and part of the video. Additionally I am looking for help using the from command with generators which was not covered at all in this video.
embedded humor in these videos is proportional to the love they cook them with 🥰
Quite funny videos but 8 minutes for a rather easy concept is a bit too much I'd say.. we are slowly (finally) reaching an era on RUclips where people realize that viewers don't like talking and prefer when it gets to the point.
Thanks
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Very helpful video and the style is hilarious. love it! Subscribed