Mu: Can not build/run: undefined symbol: PySlice_AdjustIndices

[gquintana]

I am trying to build and run master branch == v1.0.0.beta.16

I installed a fresh new Python 3.5 virtual env, downloaded requirements (I had to apt install python3-dev)

When I launch make run or make test, I get:

python run.py
Traceback (most recent call last):
  File "run.py", line 2, in <module>
    from mu.app import run
  File "/home/gquintana/Perso/mu/mu/app.py", line 29, in <module>
    from PyQt5.QtCore import QTimer, Qt
ImportError: /home/gquintana/Perso/mu/.venv/lib/python3.5/site-packages/PyQt5/QtCore.so: undefined symbol: PySlice_AdjustIndices

The same procedure worked fine on v1.0.0.beta.15

[ntoll]

What operating system are you using?

How is your version of Qt installed..?

Did you pip install mu-editor..?

[gquintana]

System: Ubuntu Xenial
python2-pyqt5 not installed at system level but in virtualenv
I didn't pip install mu-editor

[ntoll]

Hi... Mu is Python 3 only and will never support Python 2. Try it in a virtualenv that uses Python3:

virtualenv --python=/usr/bin/python3 mu_venv
source mu_venv/bin/activate
pip install mu-editor

That should do the trick.

[ntoll]

Can you let me know if this works..? If it does, I'd love to know how we could improve the pip-based installation instructions here: https://codewith.mu/en/howto/install_with_python All feedback most welcome! :-)

[gquintana]

pip install -r requirements.txt fetched

nudatus==0.0.3
setuptools==39.2.0
pyflakes==2.0.0
pycodestyle==2.4.0
appdirs==1.4.3
qtconsole==4.3.1
PyQt5==5.11
pyserial==3.4

[gquintana]

I'd like to update french translation so I need to build mu from source, here is what I have done:

git clone ...
cd mu
virtualenv .venv -p /usr/bin/python3.5
source .venv/bin/activate
pip install -r requirements.txt
make run

[ntoll]

Aha... OK... so https://mu.readthedocs.io/en/latest/setup.html is what you need. :-)

It should just work with a clean Python3 virtualenv, git clone the repos (or pull the latest code) and pip install -r requirements.txt.

I'm on Artful (17.10) and it works fine for me (although I realise that doesn't help you). Is there something else about your set up that could be impacting things..?

[gquintana]

I rm -rf the virtual and then I followed the indicated setup.
Now when I pip install --editable . I get a warning:

pyqtchart 5.11 has requirement PyQt5>=5.11, but you'll have pyqt5 5.10.1 which is incompatible.

And then when I run

Traceback (most recent call last):
  File "run.py", line 2, in <module>
    from mu.app import run
  File "/home/gquintana/Perso/mu/mu/app.py", line 34, in <module>
    from mu.interface import Window
  File "/home/gquintana/Perso/mu/mu/interface/__init__.py", line 1, in <module>
    from .main import Window
  File "/home/gquintana/Perso/mu/mu/interface/main.py", line 38, in <module>
    from mu.interface.editor import EditorPane
  File "/home/gquintana/Perso/mu/mu/interface/editor.py", line 25, in <module>
    from PyQt5.Qsci import QsciScintilla, QsciLexerPython, QsciAPIs
ImportError: /home/gquintana/Perso/mu/.venv/lib/python3.5/site-packages/PyQt5/Qt/lib/libQt5Core.so.5: version `Qt_5.11' not found (required by /home/gquintana/Perso/mu/.venv/lib/python3.5/site-packages/PyQt5/Qsci.so)

I have in my virtualenv:
PyQtChart-5.11-5.11.1-cp35.cp36.cp37.cp38-abi3-manylinux1_x86_64.whl
PyQt5-5.10.1-5.10.1-cp35.cp36.cp37.cp38-abi3-manylinux1_x86_64.whl
which are probably incompatible

Using pre built package followin "install_with_python", I get the same warning and then same error

[ntoll]

OK... something must have happened in the releases of Qt / QScintilla / QCharts since I've just tried to re-create your steps and I'm seeing errors that were not there a couple of days ago when I last did this.

I'm investigating and will let you know how I get on.

[ntoll]

OK... they did a new release today of PyQt. I suspect this is the cause of the problems. https://www.riverbankcomputing.com/news/pyqt-5110

[gquintana]

In the mean time I forced some dependencies versions in requirements.txt and it solves the problem:

qscintilla==2.10.3
qtconsole==4.3.1
pgzero==1.2
pyqt5==5.10.1
PyQtChart==5.10.1
pyserial==3.4

[ntoll]

Good call, I was just about to suggest that. In the meantime I'll try to work out what the latest version of PyQt has broken. :-/

Thanks for the heads up!

Also, please note, the final UI (along with translation strings) will be settled in about a week and a half.

Thanks!

[gquintana]

Alright.

We might do some beta testing with real users tomorrow :-P https://mixteen.org/blog/2018/06-mmi.html

[ntoll]

Awesome! Thank you for the other bug reports too. The more feedback the better..!

Also, if you're happy for me to do so, do you mind if I blog about your event and the way you use Mu? Perhaps you'd like to guest blog (it'd be awesome if it was in both English and French) with photos and/or a description of how it went. On Monday I'm announcing http://madewith.mu/ (to complement codewith.mu) and hearing and celebrating your story would make a great post.

[titimoby]

unfortunately, we (mixteen) didn't had enough network/well configured machines to use Mu this time.
But all kids are aware of it, we will push it on our resource page... once it builds again ;)

[gquintana]

@titimoby We used Mu with Microbit, I had my 2 laptops!

By the way, I don't reproduce this issue today.

[askvictor]

I've just gotten the same issue trying a pip install mu-editor on the Linux system on a Chromebook (i.e. a debian 9 container). The issue disappears if I force the particular dependency versions that @gquintana posted though pip complains that mu-editor requires the later versions of the libraries.