No module named 'PyQt5.QtWebKitWidgets'

[jschueller]

I cannot run conda-forge/orange3 (linux/py36) because of missing import:

$ PATH=$HOME/miniconda/bin:$PATH orange-canvas
Traceback (most recent call last):
  File "/home/schueller/miniconda/lib/python3.6/site-packages/Orange/canvas/application/canvasmain.py", line 26, in <module>
    from AnyQt.QtWebEngineWidgets import QWebEngineView
  File "/home/schueller/miniconda/lib/python3.6/site-packages/AnyQt/QtWebEngineWidgets.py", line 4, in <module>
    from PyQt5.QtWebEngineWidgets import *
ModuleNotFoundError: No module named 'PyQt5.QtWebEngineWidgets'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/schueller/miniconda/bin/orange-canvas", line 4, in <module>
    import Orange.canvas.__main__
  File "/home/schueller/miniconda/lib/python3.6/site-packages/Orange/canvas/__main__.py", line 26, in <module>
    from Orange.canvas.application.canvasmain import CanvasMainWindow
  File "/home/schueller/miniconda/lib/python3.6/site-packages/Orange/canvas/application/canvasmain.py", line 29, in <module>
    from AnyQt.QtWebKitWidgets import QWebView
  File "/home/schueller/miniconda/lib/python3.6/site-packages/AnyQt/QtWebKitWidgets.py", line 14, in <module>
    from PyQt5.QtWebKitWidgets import *
ModuleNotFoundError: No module named 'PyQt5.QtWebKitWidgets'

It works if I install pyqt/qt from defaults.

[ccordoba12]

Could you try with other Python versions?

[jschueller]

Yes, same thing with 2.7, 3.5: PyQt5.QtWebKitWidgets is not available (still on linux).

[mingwandroid]

Can you try without the trailing / in your new PATH entry, and also add a $ before the 2nd PATH, i.e. change: PATH=$HOME/miniconda/bin/:PATH orange-canvas to PATH=$HOME/miniconda/bin:$PATH orange-canvas

[jschueller]

oups, no, the bug is still present, comes down to:

PATH=$HOME/miniconda/bin:$PATH python -c "from PyQt5.QtWebKitWidgets import *"

[astaric]

The actual problem is a few lines above

ModuleNotFoundError: No module named 'PyQt5.QtWebEngineWidgets'

When it is not found, AnyQt falls back to QtWebKit, which was available in older versions of qt. As of why PyQt5.QtWebEngineWidgets is not available, I have no idea.

As pyqt/qt from defaults seem to work just fine, I use

conda install -c defaults pyqt=5 qt

as a workaround.

[astaric]

Never mind, I have just checked, qt from defaults channel includes QtWebKit. PyQt5 from pypi is the one that has QtWebEngine.

[mingwandroid]

As of why PyQt5.QtWebEngineWidgets is not available, I have no idea.

This may be because QtWebEngine can only be compiled and run on very modern operating system releases.

[ccordoba12]

As of why PyQt5.QtWebEngineWidgets is not available, I have no idea.

Conda packages don't provide those widgets because they require C++11 capable compilers and more modern Linux versions than those supported by Continuum (i.e. CentOS 5).

[gillins]

So do we need to be building qt with WebKit like we do on Windows? See https://github.com/conda-forge/qt-feedstock/blob/master/recipe/bld.bat#L34

[jschueller]

so it's not the lack of cxx11

[mingwandroid]

It is the lack of c++11 (on Windows) and on centos5, for defaults, the lack of modern glibc, kernel and opengl.

If c++11 wasn't a show stopper on Windows I would have tried to figure a way of getting webengine to work as well as I could on Linux as then we'd have had uniformity across all OSes.

[ccordoba12]

To be a bit more specific, the problem is with supporting WebEngine is Python 2.7 on Windows.

Besides, WebKit and WebEngine have some (minor but annoying) incompatibilities. So in the spirit of maintaining compatibility between conda-forge and defaults, I'd prefer conda-forge to continue using WebKit.

In any case, the problem here is the lack of WebKit in Qt5. I thought it was compiled correctly... @ocefpaf?

[astaric]

any updates on this?