differences between 2.7 and 3.0

[Michael Burns-Kaurin]

I ran across an old program written in 2.5, works okay in 2.7, but not 3.0.  Is there a list of changes for 3.0?

Thanks.

Michael Burns-Kaurin

[Bruce Sherwood]

It would be difficult at this late date to figure out what the difference is between 2.7 and 3.0, but it might be possible to deduce something if we see the program.

Bruce

[Michael Burns-Kaurin]

Trimmed down

https://www.glowscript.org/#/user/burnskaurinm/folder/testnewvpython/program/knotstrimmed

On Mon, Apr 28, 2025 at 12:49 PM Bruce Sherwood <bruce.s...@gmail.com> wrote:

It would be difficult at this late date to figure out what the difference is between 2.7 and 3.0, but it might be possible to deduce something if we see the program.

Bruce

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[Max DeMarr]

This was indeed a difficult change to pinpoint. I have found that there is an issue with how RapydScript is handling stored function pointers and promise returns. However, I am not super familiar with promises in JavaScript, so I can only suggest a workaround. Your "funcKnotList = [sheet_bend]" on line 225 and how you are using it in the code for the start button is perfectly Pythonic and would work in regular Python environments. Instead of properly returning the path list as it should, from the "sheet_bend" method, it now returns some kind of Promise.

As a cheap band-aid solution, you can simply write the "path" variable as a global variable, as you do with some others. You will need to initialize "path = [ ]" somewhere and implement the following changes:

add "global path" to line 35

remove the "path" parameter being passed in the "sheet_bend" method on line 34.

on line 172, simply call "funcKnotList[selected]()" without passing "path" to the method. 

Best,

- Maximillian

[Michael Burns-Kaurin]

Wow, thanks.  I'll try that out, it should be fairly straightforward.  Not sure in fact why I did what I did.

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[Michael Burns-Kaurin]

I also had to eliminate having path passed out of sheet_bend and simply call funcKnotList[selected]() without having path = to its left (which was implied in what you said).  Now the trimmed version works, time to test in the full program.

Thanks again.

[Harlan Gilbert]

There are other threads where problems between asynchronous functions are being noted.

To view this discussion visit https://groups.google.com/d/msgid/glowscript-users/CAJ5waeNz8XN9RbR56fKpeuipqpfy5H_vExT2wWQ7LsBhLPWxog%40mail.gmail.com.

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Harlan Gilbert, Ph.D.

High School Math, Physics, Computer Science, and Philosophy Teacher

Collegium Chair

Green Meadow Waldorf High School

Chestnut Ridge, NY 10977

(845) 356-2514 x. 320