trying to setup python code generator

[Jhinmainksta]

Hello everyone.

Is build-in python generator not complete?

Get blockly code Create-package script way from here:

https://developers.google.com/blockly/guides/get-started/get-the-code

Make changes here:

But for some blocks an error appears

Then, after i refresh page, code generator stops working and each further refresh brings me back to the blocks config that caused error. When i roll back index.js changes and refresh page - blockly start to work again. What am i doing wrong? 

[Christopher Allen]

Hi Jhinmainksta,

Is build-in python generator not complete?

It is.

 

Get blockly code Create-package script way from here: …

Make changes here: …

But for some blocks an error appears…

Then, after i refresh page, code generator stops working and each further refresh brings me back to the blocks config that caused error. When i roll back index.js changes and refresh page - blockly start to work again. What am i doing wrong?

You will see you have changed the code to read (emphasis added):

import {forBlock} from './generators/javascript';

// ...

Object.assign(pythonGenerator.forBlock, forBlock);

…which adds block generator functions for the demo's custom blocks, which generate JavaScript code, to the Python generator.  This… is something you can do… but will generate code containing a mix of Python and JavaScript which is unlikely to be valid in either language.

And your changes also result in:

  const code = pythonGenerator.workspaceToCode(ws);

  // ...

  eval(code);

… which will result in mostly-Python code being evaluated as JavaScript, which is again unlikely to work as you expect.

If you delete the eval statement (which you should do anyway—it's just there for demo purposes) and provide alternative versions of block generator functions in generators/javascript.js that produce Python instead then you should find things working as expected.

Best wishes,

Christopher

 

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[Jhinmainksta]

Seems like it's all because of eval() trying do execute python code. Find out that it's javascript method while searched how to execute python code earlier, but somehow didn't think of it 😊. Tywm,  Christopher!