Re: Can Embedded Python Blocks have callbacks?

[Philipp Niedermayer]

As a workaround, use python's property construct to intercept changes on class attribute level:

class blk(...):
    def __init__(self, example_param=1.0):
        ...

        # [...] (properties work, too)
        self.example_param = example_param

|@property|
|    def |example_param|(self):|
|return self._|example_param
|
|
|    @|example_param|.setter|
|def |||example_param|||(self, value):|
|       print('here')
|
|self._|||example_param|||= value
|


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*From:* Jameson Collins [mailto:jameson.coll...@gmail.com]
*Date:* Thursday, June 20, 2024 at 14:10 UTC+2
*Subject:* Can Embedded Python Blocks have callbacks?

This was my concern, and it does appear to behave that way.



    On 19/06/2024 14:51, Jameson Collins wrote:
    > I'm trying to use a callback to set a variable in an embedded
    python
    > block.  Using the tutorial
    > (https://wiki.gnuradio.org/index.php/Embedded_Python_Block
    > <https://wiki.gnuradio.org/index.php/Embedded_Python_Block>) as an
    > example I added the function below.  I've found that this
    callback never
    > gets called when I update this value from a GUI.  Should it be?
    >
    > |def set_example_param(self, example_param): print("here")|

    Hi Jameson,

    I think Embedded Python blocks can only have (automatically
    generated)
    callbacks for __init__() arguments that are assigned as

    self.foo = foo

    in the body of __init__() (the example template that you get when you
    create a new Embedded Python block shows how this works).

    If you need more complex callbacks, I think you need to create a
    regular
    Python block in an OOT module.

    Best,
    Daniel.

On Wed, Jun 19, 2024 at 4:34 PM Daniel Estévez <dan...@destevez.net> wrote:

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