Canvas code from Brython 3.0 to Brython 3.2

[dan d.]

Hello,

I have not been active for a while and saw  version 3.2 of Brython was out. So I wanted to test my last simple HTML5 canvas brython code with version 3.2 of Brython.
And of course it dies :)  hehehe

I kept the exact same HTML file and .py code file that I used successfully with version 3.0 of Brython.

Test page:   http://webswap.free.fr/brythonrocks/v2/simple2.html
Code page:  http://webswap.free.fr/brythonrocks/v2/simple2.py

I'm straching my head :)

I get this error stack:

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help http://xhr.spec.whatwg.org/ brython.js:3901
Error:  brython.js line 5785 > eval:131
Error:
Stack trace:
_b_.SyntaxError@http://webswap.free.fr/brythonrocks/v2/brython.js line 5785 > eval:131:396
$B.$SyntaxError@http://webswap.free.fr/brythonrocks/v2/brython.js:4610:46
$_SyntaxError@http://webswap.free.fr/brythonrocks/v2/brython.js:95:47
$transition@http://webswap.free.fr/brythonrocks/v2/brython.js:2613:96
$transition@http://webswap.free.fr/brythonrocks/v2/brython.js:2845:1
$transition@http://webswap.free.fr/brythonrocks/v2/brython.js:3095:1
$tokenize@http://webswap.free.fr/brythonrocks/v2/brython.js:3705:1
$B.py2js@http://webswap.free.fr/brythonrocks/v2/brython.js:3785:5
brython@http://webswap.free.fr/brythonrocks/v2/brython.js:3921:10
onload@http://webswap.free.fr/brythonrocks/v2/simple2.html:1:1
 brython.js:3934
"__name__ : " "SyntaxError" brython.js:3935
"$js_exc : " undefined brython.js:3935
"args : " Array [ "non-keyword arg after keyword arg", Array[4] ] brython.js:3935
"$message : " "non-keyword arg after keyword arg" brython.js:3935
"__class__ : " Object { __class__: Object, __name__: "SyntaxError", __bases__: Array[1], __module__: "builtins", __mro__: Array[4], $factory: _b_.SyntaxError() } brython.js:3935
"$py_error : " true brython.js:3935
"$stack : " Array [ Array[2] ] brython.js:3935
"$line_info : " "39,__main__" brython.js:3935
"Traceback (most recent call last):
  module __main__ line 39
            drawRotateImage(imgBall, self.pos[0], self.pos[1], rotationAngle = 0, 90, 90, 90, 90)
SyntaxError: non-keyword arg after keyword arg,__main__,39,73,drawRotateImage(imgBall, self.pos[0], self.pos[1], rotationAngle = 0, 90, 90, 90, 90)"

[dan d.]

This was tested on Firefox 31.8 under Debian Linux and on Firefox 34 on Windows 8. Same Error stack in both cases.
It also dies under Chrome.

Dan

[Billy Earney]

Hi Dan,

Should the rotationAngle argument be a tuple or list?

so

  drawRotateImage(imgBall, self.pos[0], self.pos[1], rotationAngle = 0, 90, 90, 90, 90)

should be:

  drawRotateImage(imgBall, self.pos[0], self.pos[1], rotationAngle = (0, 90, 90, 90, 90))

Billy

     

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[dan d.]

Hey Billy

Actually no, its not a list or a tuple. Its an integer.
Turns out in brython 3.0 the syntax with  "parameter name = value" in the parameter list of a function, did not raise an error. But in version 3.2, it raises an error. At least, I think this is the problem. Is this a bug in brython 3.2 ?

So to fix the code, I changed it to:
drawRotateImage(imgBall, self.pos[0], self.pos[1], 0, 90, 90, 90, 90)

Before I had :

drawRotateImage(imgBall, self.pos[0], self.pos[1], rotationAngle = 0, 90, 90, 90, 90)

The function signature is:
drawRotateImage(image, posX, posY, rotationAngle, imgSizeX, imgSizeY, displaySizeX, displaySizeY)

Now the page loads and the demo works.
http://webswap.free.fr/brythonrocks/v2/simple2.html

Cheers,
Dan

[Joao S. O. Bueno]

On 29 July 2015 at 09:53, dan d. <dandelso...@gmail.com> wrote:
> Hey Billy
>
> Actually no, its not a list or a tuple. Its an integer.
> Turns out in brython 3.0 the syntax with "parameter name = value" in the
> parameter list of a function, did not raise an error. But in version 3.2, it
> raises an error. At least, I think this is the problem. Is this a bug in
> brython 3.2 ?

Parameter_name=value is not a bug in Brython nor in Python - which
Brython mirrors.
Now, youcan pass anonymous parameters after named parameters - that is
a syntax error
in Python, and if it passed in brython 3.0 it was a bug there. -
You passa nonymous parameters, in the order they are defined - after
tyou naem a parameter, you have to name
all other parameters that come after it.

>
> So to fix the code, I changed it to:
> drawRotateImage(imgBall, self.pos[0], self.pos[1], 0, 90, 90, 90, 90)
>
> Before I had :
> drawRotateImage(imgBall, self.pos[0], self.pos[1], rotationAngle = 0, 90,
> 90, 90, 90)
>
> The function signature is:
> drawRotateImage(image, posX, posY, rotationAngle, imgSizeX, imgSizeY,
> displaySizeX, displaySizeY)
>
> Now the page loads and the demo works.
> http://webswap.free.fr/brythonrocks/v2/simple2.html
>
> Cheers,
> Dan
>

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[dan d.]

Hey Joao,

Thanks for the feedback. Sorry for my python code mistake in the function parameter list...

Cheers
Dan

[Billy Earney]

No worries!

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