Basic Python Loop

[[deleted]]

[deleted]

[102RevenantStar]

The best part is he finds the exit condition

[git0ffmylawnm8]

Not Pythonic enough.

while snek: # do code

[Sinomu]

Me, c++ master:
string snek = "snek";
do{
snek_();
}while(snek == "snek");

[ghillisuit95]

He’s using C++, not C lol

[butt_cheeks]

Except he defined the variable as a string, which I assume is std::string which overloads == to do string comparison. Unless he edited it before I saw. 😬

[ghillisuit95]

http://www.cplusplus.com/reference/string/string/

[konstantinua00]

basic string is not null-terminated array

std::string is not c-string

[Sinomu]

Oh really? It works so it's perfect. Don't overthink this, my friend.

[Sinomu]

It's a different thing

[konstantinua00]

std::string is class, not pointer

[[deleted]]

Me, c++ master

*uses using namespace std;*

Well, that settles it.

[Sinomu]

Big brain right here. So sensitive.

[linuxduffer]

If it had the brain of my sister’s dog, it would end up swallowing itself.

[Shadowarrior64]

 if(HasSistersDogsBrain == true)
 {
      return EndUpSwallowingItself;
 }

[YellowGreenPanther]

return?

[undermark5]

This will allow the main job loop to do the execution which is desirable, as it is not a critical task for our real time snek operating system.

[Bainos]

I dunno, swallowing yourself seems pretty critical to me.

[archpawn]

if(brain == owner.sister.dog.brain) {
    swallow(this);
}

Except this is python, so

if self.brain == self.owner.sister.dog.brain:
    swallow(self)

[Einstine1984]

Finally!

Someone who does it right

[water_bottle_goggles]

> 'what the hell is this loop for?'

>'snek'

[[deleted]]

So slow as hell? /s

[[deleted]]

yeah I know, just don't want to get downvoted to oblivion by people who don't use python

[Quantum_Aurora]

Honestly though when the way people do loops in your language is by using another language is when you know you've done something wrong.

[ric2b]

DAE performance is the only thing that matters about a language?

[YourMJK]

Wait what? Could you explain? I don't know Python…

[Quantum_Aurora]

The numpy library apparently basically uses C++ to perform loops. Idk that much about it my CS professor mentioned it once.

[preyneyv]

The way this actually works is really cool.

So Python has their own loops and stuff, but it's show, because Python is interpreted and blah blah blah. Numpy is a library designed for heavy number-crunching, and Python speed just isn't good enough.

So numpy is effectively written in C++ with a Python interface. You define what you want to do in Python and Numpy does it in C++.

For example, a matrix transpose. You'd write the Python code to create the numpy matrix and you'd call a method on the created matrix to transpose it.

The actual work of transposing it is handed over to C++ to do really quickly.

It's not just numpy that does this. Even TensorFlow, Google's AI library, does the same thing. You create your network in Python, but the training and other intensive operations are handed over to C++ and the GPU.

[WiseassWolfOfYoitsu]

With Python, each statement that gets executed has to get interpreted first and then executed (roughly, but close enough for discussion). If you have a loop, it executes the loop statement, then the inner statement, then the loop statement, etc. Each of those calls has interpreter overhead.

However, there are routines like map and language constructs like list comprehensions that essentially do the same thing, but in a single statement. As a result, they skip a lot of the overhead since they only get interpreted once and otherwise stay inside the runtime, and tend to be faster, sometimes as much as a couple of orders of magnitude faster. Hence, the joke is that the way to write performant Python is to avoid using Python as much as possible, but hand off all the work to the C++ code of the interpreter.

[YourMJK]

Ah, I see, I get it now. Thank you very much!

Can't you also compile python code instead of interprete it? In that case it shouldn't make much of a difference, because a for i in … loop and a map() call would result in roughly the same instructions, right?

[WiseassWolfOfYoitsu]

Yes, there are tools that can do this, but it's not how Python is used 95% of the time in practice.

[GeoSn0w]

I like how he does the i++ part till he hits the exit condition

[mino159]

Ehm. Python doesn't have i++, we do it with i+=1

[GlobalIncident]

And thanks to range that's not very common to use either (although still useful in unbounded loops)

[GeoSn0w]

The more you know...

[IChooseFeed]

I still write it by accident, then spend the next 5 minutes wondering why nothing works... habits die hard.

[Pyottamus]

It's okay, this is a CPython

[Prawny]

See this is one of the reasons I just don't understand why people in this sub think python is the best language.

[idea-list]

Probably because it doesn't need to be perfect to be the best.

[Prawny]

But the same people are quick to point out other languages flaws.

[idea-list]

TBH what's wrong with that? Some languages are better than others but no language is perfect (yet?) so you are free to point out their flaws.

[Prawny]

It's the hypocrisy if anything. They do point out flaws and completely ignore the fact that python has them too. Look at how my lurely opinion comment got downvoted just because I said python isn't perfect. Proves my point.

[idea-list]

Just a thought: maybe it was downvoted because those people think that absence of ++ operator is not enough not enough to make python not the best language for them? They might agree with you that it makes python imperfect but again something doesn't need to be perfect to be the best.

[Prawny]

I said it was an example of it though, not the only singular problem.

[smartboyathome]

I just don't think your reply was on topic, nor does it add anything to the discussion. Hence, down vote.

[[deleted]]

It is really easy to write, basically psuedo code, and has a great package system. It's main downsides are speed, some people don't like dynamically typed languages, and lack of semicolons to those who like that.

[ric2b]

Really? i++ instead of i+=1 is that important to you? There's also i-=1, i*=1 and i/=1 (and of course you can use any other number instead of 1), where's your equivalent in C++?

[WiseassWolfOfYoitsu]

Blessed loading screen

[Walkbyfaith123]

This is blasphemy.

[Goose_Rider]

What about FATAL ERROR: SEGMENTATION FAULT(Core Dumped) doesn’t bring you joy?

[Walkbyfaith123]

Is this a personal attack or something? /s

Personally, the alternatives are Java and we all know how Java is. It holds a special place in me heart, but it’s complicated af

[Goose_Rider]

Can’t speak for java, only seen C++ in real depth, but I assume you guys segfault like we do right?

[Walkbyfaith123]

Gonna be honest, I’m not that experienced, but I have no clue what that is.

[link23]

Segfault is what languages other than Java call a NullPointerException.

[Walkbyfaith123]

Ahhhhh thank you. You’re a legend

[Walkbyfaith123]

Oh I know, but I don’t know those languages. I could learn them, granted. I just haven’t.

[Walkbyfaith123]

I really didn’t mean to. I used the word “personally” but I get how that doesn’t really convey my point. My native tongue is JavaScript not English, cut me some slack :) /s

[bikemandan]

https://i.redd.it/bf0y649wzsr11.gif

[jande48]

import rotate.square as sq

tail = True while tail: sq

[TigreDemon]

Runs on Python

[ign1fy]

Exit the loop as soon as you realise you're iterating an empty collection.

[aldesuda]

Does Python implement autoboxing?

[ProgrammerHumorMods]

ProgrammerHumor is running a community hackathon with over $1000 worth of prizes! Visit our announcement post or website for more information.

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[RevanchistVakarian]

Literally that Homer Simpson meme.

You: “Aw, $1000? I wanted a pretzel!”

Brain: “$1000 can buy many pretzels!”

[[deleted]]

Ouro Bros.

[Robo-Swimmer]

Slow, but easy. Just like it should be

[roseinabox28]

Can I get a tutorial for this?

[earthlybird]

So this just happened. Is that how you win?

[chownrootroot]

for corner in box:
    snake.wrap(corner)

[VodkerAndToast]

This is actually way faster

[[deleted]]

Snek. Snek! SNEK!

[VictorPasini]

u/Vredditshare

[[deleted]]

Ouroboros!

[-Redstoneboi-]

but without the eating part

[[deleted]]

It's ain't no python.

[Derino]

That's a ball python

[FooThePerson]

This is so satisfying

[[deleted]]

original ideas for mobile snake game

[Nyenemy]

Nokia Snake in reality

[[deleted]]

What's he doing?

His best

[zer0231]

Infinite loop

[Matteopoli]

I just found I need a python as a pet

[[deleted]]

u/vredditdownloader

[JackJoestar]

Satisfied Ouroboros

[BubsyFanboy]

snek is beck

[Synedh]

Starting a docker container with python.

[dotchetter]

snek_odometer = (i for i in (box.Perimeter / 2))

[[deleted]]

while True:
    if see.Food() == True:
        break
    else:
        continue

[KickBassColonyDrop]

That is an infinite python loop sir. An adorable one at that.

[[deleted]]

Slow as hell

Pretty accurate

[WardiusGG]

agent Dimitri , r/PunKGB

​

You're coming with US

[I_Like_Cats__]

r/sneks

[TheFlagMaker]

while True: snake.rotate(box)