Missing module metapensiero in Linux install instructions?

[JoKeyser]

Hi, these are my first steps with OpenSesame, thank you for this open science software.

There was a small bump in my initial experience: Installing on Ubuntu 24.04.3, I've followed the instructions at https://osdoc.cogsci.nl/4.1/download/#linux-ubuntu. That is, I ran the following commands:

conda create -n opensesame-41 python=3.13
conda activate opensesame-41
pip install --pre opensesame-core opensesame-extension-sigmund opensesame-extension-osweb opensesame-extension-updater opensesame-plugin-psychopy opensesame-plugin-media_player_mpy pygame

I then opened up a new OSWeb experiment and tried to run it, which failed with an error message about missing module metapensiero.

Traceback (most recent call last):
  File "/home/jo/apps/miniforge3/envs/opensesame-41/lib/python3.13/site-packages/libqtopensesame/extensions/_extension_manager.py", line 158, in fire
    return_value = ext.fire(event, **kwdict)
  File "/home/jo/apps/miniforge3/envs/opensesame-41/lib/python3.13/site-packages/libqtopensesame/misc/base_subcomponent.py", line 56, in fire
    return getattr(self, u'event_%s' % event)(**kwdict)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/home/jo/apps/miniforge3/envs/opensesame-41/lib/python3.13/site-packages/opensesame_extensions/osweb/oswebext/oswebext.py", line 304, in event_osweb_run
    from osweb import convert
  File "/home/jo/apps/miniforge3/envs/opensesame-41/lib/python3.13/site-packages/osweb/convert.py", line 35, in <module>
    from .oswebwriter import OSWebWriter
  File "/home/jo/apps/miniforge3/envs/opensesame-41/lib/python3.13/site-packages/osweb/oswebwriter.py", line 22, in <module>
    from metapensiero.pj.__main__ import transform_string as py2js
ModuleNotFoundError: No module named 'metapensiero'

My first guess how to add what's missing was to pip install javascripthon, which seems to have worked.

If that's the correct solution, maybe this should be mentioned in the install instructions?

[smathot]

Hi @JoKeyser ,

Thanks for this. If I remember correctly, there's a complication here in the sense that the default javascripthon package is incompatible with PsychoPy, which is why they bundle a custom package: javascripthon @ git+https://gitlab.com/peircej/metapensiero.pj. Can you confirm for me that:

1. Your install of the default javascripthon has fixed OSWeb but broken the psycho backend
2. pip install git+https://gitlab.com/peircej/metapensiero.pj fixes both

If that indeed checks out, I'll update the instructions.

— Sebastiaan