Re: self.set_history error for python custom block

[Marcus Müller]

Yep, most methods of classes are like that; you need to initialize the class first, then 
can work on its state :) That's why other programming languages than Python don't even 
give you that much freedom about when to call the superclass constructor.

Anyway, I'm very glad you were able to fix that! Happy developing!

Cheers,
Marcus

On 25.09.23 23:01, Ivan Iudice wrote:
> I found out to make it work!
> The problem was that set_history needs to be called after the constructor of 
> the super class. Probably it needs to know first the input signature. You will 
> be able to confirm me that.
> Thanks for help!
>
> Ivan
>
> > Il giorno 25 set 2023, alle ore 16:12, Marcus Müller <mmueller@gnuradio.org> ha 
> > scritto:
> >
> > Python incompatibility can safely be ruled out; you wouldn't get far enough. 
> > Please share a minimal example of a block that triggers the behaviour.
> >
> > Best,
> > Marcus
> >
> > > On 25.09.23 15:49, Ivan Iudice wrote:
> > > Nobody knows where could be the problem?
> > > I thought an incompatibility between gnuradio and python versions.
> > > Regards.
> > > Ivan
> > > > > Il giorno 21 set 2023, alle ore 18:13, Ivan Iudice <krono86@tiscali.it> ha 
> > > > > scritto:
> > > >
> > > > Dear Jeff,
> > > > thank you for answer.
> > > > My code does exactly the same things.
> > > > Regards.
> > > >
> > > > Ivan
> > > >
> > > > > Il giorno 21 set 2023, alle ore 17:55, Jeff Long <willcode4@gmail.com> ha 
> > > > > scritto:
> > > > >
> > > > > 
> > > > > Here is an example (from the QA code) of using history from a Python block.
> > > > >
> > > > > https://github.com/gnuradio/gnuradio/blob/5953d3c96b42086c5f8c5f97b6fd7e57717f9aa5/gr-blocks/python/blocks/qa_block_gateway.py#L60
> > > > >  
> > > > > <https://github.com/gnuradio/gnuradio/blob/5953d3c96b42086c5f8c5f97b6fd7e57717f9aa5/gr-blocks/python/blocks/qa_block_gateway.py#L60>
> > > > >
> > > > > See if your code appears to be doing the same thing.
> > > > >
> > > > > On Thu, Sep 21, 2023 at 11:03 AM <krono86@tiscali.it 
> > > > > <mailto:krono86@tiscali.it>> wrote:
> > > > >
> > > > >     __
> > > > >     Hello List!
> > > > >     I'm trying to implement a sync block into a OOT module that use previous 
> > > > > samples of
> > > > >     the input streams.
> > > > >     So, I'm using the method set_history in the constructor.
> > > > >     The problem is that when I use self.set_history(N) I obtain the following 
> > > > > errors:
> > > > >
> > > > >     Generating: 
> > > > > '/home/userr/workspace/gnuradio-oot/gr-customModule/examples/untitled.py'
> > > > >
> > > > >     Executing: /usr/bin/python3 -u
> > > > >     /home/user/workspace/gnuradio-oot/gr-customModule/examples/untitled.py
> > > > >
> > > > >     QSocketNotifier: Can only be used with threads started with QThread
> > > > >     Traceback (most recent call last):
> > > > >       File 
> > > > > "/home/user/workspace/gnuradio-oot/gr-customModule/examples/untitled.py",
> > > > >     line 291, in <module>
> > > > >         main()
> > > > >       File 
> > > > > "/home/user/workspace/gnuradio-oot/gr-customModule/examples/untitled.py",
> > > > >     line 269, in main
> > > > >         tb = top_block_cls()
> > > > >              ^^^^^^^^^^^^^^^
> > > > >       File 
> > > > > "/home/user/workspace/gnuradio-oot/gr-customModule/examples/untitled.py",
> > > > >     line 179, in __init__
> > > > >         self.customModule_testBlock_0_0 = customModule.testBlock(1, max_lag, 
> > > > > lags,
> > > > >     alpha, win_len, 1, False)
> > > > >                                              
> > > > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > > > >       File
> > > > >     
> > > > > "/usr/local/lib/python3.11/dist-packages/gnuradio/customModule/testBlock.py", 
> > > > > line
> > > > >     33, in __init__
> > > > >         self.set_history(self.max_pos_lag-self.min_neg_lag+1)
> > > > >         ^^^^^^^^^^^^^^^^
> > > > >       File "/usr/lib/python3/dist-packages/gnuradio/gr/gateway.py", line 129, in
> > > > >     __getattr__
> > > > >         if not hasattr(self, "gateway"):
> > > > >                ^^^^^^^^^^^^^^^^^^^^^^^^
> > > > >       File "/usr/lib/python3/dist-packages/gnuradio/gr/gateway.py", line 129, in
> > > > >     __getattr__
> > > > >         if not hasattr(self, "gateway"):
> > > > >                ^^^^^^^^^^^^^^^^^^^^^^^^
> > > > >       File "/usr/lib/python3/dist-packages/gnuradio/gr/gateway.py", line 129, in
> > > > >     __getattr__
> > > > >         if not hasattr(self, "gateway"):
> > > > >                ^^^^^^^^^^^^^^^^^^^^^^^^
> > > > >       [Previous line repeated 984 more times]
> > > > >     RecursionError: maximum recursion depth exceeded
> > > > >
> > > > >     >>> Done (return code 1)
> > > > >
> > > > >     I'm using GNU Radio 3.10.5.1 (Python 3.11.2) on Debian 12.
> > > > >     What is going on?
> > > > >     Thanks in advance!
> > > > >     Ivan