I respond to myself :

 If you encounter "Cannot import gnuradio" error, then go to Finding the Python library to set your PYTHONPATH and LD_LIBRARY_PATH.
After setting these environment variables, you need to do sudo ldconfig again for the Linux dynamic library loader to find the just-installed GNU Radio libraries.
If you have installed in a custom path with -DCMAKE_INSTALL_PREFIX=XXX, you will need to add that path to $PATH in order to find gnuradio-companion.

see here :  https://wiki.gnuradio.org/index.php/ModuleNotFoundError#B._Finding_the_Python_library 

regards,
Jean-Philippe



----------------------------------------------------------------------

Message: 1
Date: Sat, 6 Feb 2021 19:18:50 +0100
From: J-Ph Buchet <jph.buchet@gmail.com>
To: "tetrapol-kit@brmlab.cz" <tetrapol-kit@brmlab.cz>
Subject: [Tetrapol-kit] since Python 3...
Message-ID: <601edd89.1c69fb81.4f339.8b18@mx.google.com>
Content-Type: text/plain; charset="utf-8"

Hello,
I am installing the kit on raspiOS ( rpi3b+/buster).
Since several days I am looking for a solution about the error I get after launch the .sh file :

Traceback (most recent call last):
File "../demod/demod.py", line 10, in
from gnuradio import gr, gru, eng_notation, blocks, filter, digital, analog
ModuleNotFoundError: No module named 'gnuradio'

Does anybody have an idea to resolve that ?
I am sure, Gnuradio « knows » python 3.7 path :
after a ctrlC :
   for l in sys.stdin:
«   File "/usr/lib/python3.7/codecs.py", line 319, in decode    def decode(self, input, final=False): « 

Thank you !
JPh



Provenance : Courrier pour Windows 10

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