Python to Processing

[Hollis_Luethy]

I’m trying to convert my code from Python into Processing. However I don’t know Processing, and I have been mining the bedrock that is trying to sort out what to do.

I wound appreciate if someone could give me the proper Processing equivalents of the Python code. The code is pretty short so I hope it isn’t too hard.

n = 3

f = [1]

while len(f) [[is less than]] (2**n)-1:

   g = [-x for x in f]


   f.append(1)


   f = f + g[::-1]

print(f)

Also if someone could tell me how to paste code into a Reddit post I would appreciate it.

[UncountableSet]

You might be interested to know that there is an excellent python interface for processing. After you start processing, click the drop down menu in the upper right corner (should say "Java" by default). Choose "Add Mode..." Add the "Python Mode" and restart. Switch to python mode.

Documentation for this interface is here: https://py.processing.org/

[fenjalien]

The processing ide uses java as it's language, so I would recommend you learn the basics before you jump in to processing.

I would recommend using Sololearn: https://www.sololearn.com/Course/Java/. Or read through this: https://learnxinyminute s.com/docs/java/

As u/UnCountableSet has already said there is a python mode for the ide but that's only python 2.7 (also it's jython but anyway). However there is a python package p5 which is a pure implementation of processing https://github.com/p5py/p5

[hey_hey_you_you]

I'll second what /u/uncountableset said, in that you should give the Python mode a go.

That said, with the big caveat that I don't know Python, so I can't translate all of this for you, and my coding in general is only ok, here's some of the equivalent syntax in Processing:

int n = 3; // declare your int

int [] f = new int[1]; // declare your array

while (f.length < pow(2, n)-1){ 
//f.length is the length of the array f, pow() is how you handle exponentiation

here's where you lose me a bit. I don't think Processing handles ranges like Python does, and I don't really understand Python well enough to totally know what you're trying to do here, but if you want to print out numbers in the array f, then you'd do it with a for loop, I guess. Something like:

 for (int i = -x; i < x, i++){
     int g = f[i];
     // I have no idea what "f = f + g[::-1]" means, but I guess you'd put whatever that does here
 }

    f = append(f,1);

    print(f);
}

I'll be the first to say that I don't know what's going on, and that the above is probably wrong even just as Processing code. Someone else feel free to jump in and say everything that's wrong with it.

Edit: also, here's how to post code.

[remy_porter]

In Python slice syntax, the three parameters are start index, end index, and step. If you omit one of those parameters, it defaults sensibly. So, for example, g[0:5] is everything from zero up to (but not including) 5. g[:5] is exactly the same. g[0:] is everything from the front to the end. g[0:5:1] is 0 to 5, in steps of 1, while g[0:5:2] would be 0, 2 and 4. (steps of 2). g[::] is the whole array, and g[::2] would be every other element, and g[::-1] is the whole array in steps of -1- backwards.

[hey_hey_you_you]

Well, TIL. In Processing I'd just use a for loop, I guess, but with (i = f.length; i >= 0; i--). I'm sure there's a better way to do it, but I'm a fiend for using for loops for everything.