[LAU] mididings Python woes; workaround or fix?

Jonathan E. Brickman jeb at ponderworthy.com
Mon Jan 31 13:39:45 CET 2022


Mididings may be the only JACK-api MIDI router/filter tool around; if 
there is another I'd love to know about it.  On the other hand t was 
working just dandy until, I think, some changes to both Python3 and 
legacy support for Python2.  I was using its Python3 AUR adaptation 
(mididings-git) under Manjaro, but then after package upgrades, it began 
to fail at 'from mididings import *' (see below).  I found similar 
failures in Ubuntu 20, and found different failures in both when I tried 
setting up to use Python2 (which obviously we would rather not be 
doing).  The failure is similar to a number of failures reported 
starting with Python 3.10, so this may be related, but I was not able to 
figure out how to apply those workarounds to the mididings source, I 
tried several different variations, including a number of the different 
forks in github.

Thoughts, anyone?  I found Pigiron and Jamrouter and puredata, but none 
of these appear to do JACK.  I'm using pipewire now, so I could 
theoretically revise the whole rig around ALSA MIDI, but all of the apps 
needing MIDI use JACK, and mididings is so elegant...

J.E.B.


|[jeb at newbnr ~]$ python Python 3.10.1 (main, Dec 18 2021, 23:53:45) [GCC 
11.1.0] on linux Type "help", "copyright", "credits" or "license" for 
more information. >>> from mididings import * Traceback (most recent 
call last): File "<stdin>", line 1, in <module> File 
"/usr/lib/python3.10/site-packages/mididings-2.0.0+r26a40db-py3.10- 
linux-x86_64.egg/mididings/__init__.py", line 15, in <module> from 
mididings.engine import run, process_file File 
"/usr/lib/python3.10/site-packages/mididings-2.0.0+r26a40db-py3.10-linux-x86_64.egg/mididings/engine.py", 
line 15, in <module> import mididings.patch as _patch File 
"/usr/lib/python3.10/site-packages/mididings-2.0.0+r26a40db-py3.10- 
linux-x86_64.egg/mididings/patch.py", line 15, in <module> import 
mididings.units as _units File 
"/usr/lib/python3.10/site-packages/mididings-2.0.0+r26a40db-py3.10-linux-x86_64.egg/mididings/units/__init__.py", 
line 14, in <module> from mididings.units.engine import * File 
"/usr/lib/python3.10/site-packages/mididings-2.0.0+r26a40db-py3.10-linux-x86_64.egg/mididings/units/engine.py", 
line 55, in <module> def SceneSwitch(number=_constants.EVENT_PROGRAM): 
File 
"/usr/lib/python3.10/site-packages/mididings-2.0.0+r26a40db-py3.10-linux-x86_64.egg/mididings/unitrepr.py", 
line 46, in composed return arguments.accept(*constraints, **kwargs) 
(store(f)) File 
"/usr/lib/python3.10/site-packages/mididings-2.0.0+r26a40db-py3.10-linux-x86_64.egg/mididings/arguments.py", 
line 49, in __init__ self.constraints = [_make_constraint(c) for c in 
constraints] File 
"/usr/lib/python3.10/site-packages/mididings-2.0.0+r26a40db-py3.10-linux-x86_64.egg/mididings/arguments.py", 
line 49, in <listcomp> self.constraints = [_make_constraint(c) for c in 
constraints] File 
"/usr/lib/python3.10/site-packages/mididings-2.0.0+r26a40db-py3.10-linux-x86_64.egg/mididings/arguments.py", 
line 160, in _make_constraint elif isinstance(c, collections.Callable): 
AttributeError: module 'collections' has no attribute 'Callable' >>>|

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