Importing QJSEngine from PyQt5.QtQml, not found

mastertea · 10-18-2019, 12:24 PM

So I'm current writing a plugin and need a way to convert javascript code to python and came to a solution by using [QJSEngine] class, however after testing the code in calibre I found out that the module [PyQt5.QtQml] couldn't be found. I got the following error:
"ImportError: No module named QtQml"

I looked into calibre installed dir and within it I found that it did include [Qt5Qml.dll] lib however didn't include the python wrapper file.

My question are:
1. Is there a reason for not include the python wrapper file for [Qt5Qml.dll] or is [QJSEngine] class is located in a different module within calibre?

2. Is there another way of access javascript code from python using only calibre included libraries?

I'm using calibre on windows.

Edit: Testing on calibre 4.2

kovidgoyal · 10-18-2019, 09:04 PM

QJSEngine is not used by calibre. So there is no reason to include the PyQt module, it just wastes space. If you want to run JS from python use QWebEnginePage, see rapyscript.py for an example of doing this. Note that you cannot use QWebEngine in the main calibre process because it needs to be imported before QApplication is constructed, so you will need to fork a worker process to do it.

10-18-2019, 12:24 PM	#1
mastertea Junior Member Posts: 2 Karma: 10 Join Date: Oct 2019 Device: Kobo Libra H2O	Importing QJSEngine from PyQt5.QtQml, not found So I'm current writing a plugin and need a way to convert javascript code to python and came to a solution by using [QJSEngine] class, however after testing the code in calibre I found out that the module [PyQt5.QtQml] couldn't be found. I got the following error: "ImportError: No module named QtQml" I looked into calibre installed dir and within it I found that it did include [Qt5Qml.dll] lib however didn't include the python wrapper file. My question are: 1. Is there a reason for not include the python wrapper file for [Qt5Qml.dll] or is [QJSEngine] class is located in a different module within calibre? 2. Is there another way of access javascript code from python using only calibre included libraries? I'm using calibre on windows. Edit: Testing on calibre 4.2 Last edited by mastertea; 10-18-2019 at 12:27 PM.

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10-18-2019, 09:04 PM	#2
kovidgoyal creator of calibre Posts: 45,320 Karma: 27111242 Join Date: Oct 2006 Location: Mumbai, India Device: Various	QJSEngine is not used by calibre. So there is no reason to include the PyQt module, it just wastes space. If you want to run JS from python use QWebEnginePage, see rapyscript.py for an example of doing this. Note that you cannot use QWebEngine in the main calibre process because it needs to be imported before QApplication is constructed, so you will need to fork a worker process to do it.

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