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Re: [Discuss-gnuradio] OOT Python Block

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] OOT Python Block
Date: Fri, 30 Jan 2015 05:38:20 -0500

On Fri, Jan 30, 2015 at 5:31 AM, Ludwig Stephan (CR/AEH4) <address@hidden> wrote:

Hi Tom,


as far as I understood the original post, we talk about pure python blocks, hence no impl.cc file. My experience is that gr_modtool makexml does not work for these blocks. I will try to reproduce the effect and will post this – but not before mid of next week.




Ahh! Thanks for pointing that out. I had missed the fact that it was a Python block (and I rarely work with them myself).

Ok, I think the fix for that is to add a "from x import *" into the __init__.py file for the module where x is your Python block. We should test this and add it to gr_modtool to avoid this confusion in the future.




Von: address@hidden [mailto:address@hidden] Im Auftrag von Tom Rondeau

Gesendet: Freitag, 30. Januar 2015 09:45
An: Ludwig Stephan (CR/AEH4)
Cc: Richard Bell; address@hidden
Betreff: Re: [Discuss-gnuradio] OOT Python Block


On Fri, Jan 30, 2015 at 2:03 AM, Ludwig Stephan (CR/AEH4) <address@hidden> wrote:

Hi Richard,


I noticed the same problem with some blocks in my own OOT module. I do not know why, but if you change the lines in the GRC file to (if not already done)

<import> import my_module.my_block_name_here</import>



(note the double block_name in <make>)


I do not remember right, but it might also be sufficient to change only either one of the lines (you have to try on your own).

You can try by calling the from python. E.g. IPython has tab completion and you can see  by import my_module.<tab> (and so on for the make line), what block is how accessible.


Regards Stephan



That can't be right. You really shouldn't have to do that to get the block to work.


We periodically get this bug from our users, no one has ever explained how to reproduce it, and I've never seen this failure mode myself. As long as you used gr_modtool and made the necessary changes to the files -- which really just means fixing the <+...+> in the impl.cc file -- then it should just "work".






Gesendet: Donnerstag, 29. Januar 2015 23:22

An: address@hidden
Betreff: [Discuss-gnuradio] OOT Python Block


I've created a python block that I've tested via command line. It passes all qa tests. I've also created an xml file for it and installed it. I followed every step the OOT Python Tutorial explains. 


I see the category and block in gnuradio-companion. When I use my block in a flowgraph, upon to executing the graph I get 


AttirbuteError: 'module' object has no attribute '<my_module_name_here>'


I've added the block build location to the PYTHONPATH variable and confirmed that I can import my module at a python command line. 


What do I not have set correctly and what is this error telling me?




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