Show widget with PySide2 embedded in Qt5 application

**tuli** · 13th February 2020, 22:47

Hi,

I have embedded a Python interpreter in my Qt5.12.0 App. The interpreter is python 3.6, running on Ubuntu 18.04. Everything works as expected.
But now I want to show a widget from a python script inside my application, with PySide2.

Qt Code:

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import sys
from PySide2.QtWidgets import QApplication, QLabel
 
app = QApplication(sys.argv)
label = QLabel("<font color=red size=40>Hello World!</font>")
label.show()
app.exec_()

import sys
from PySide2.QtWidgets import QApplication, QLabel

app = QApplication(sys.argv)
label = QLabel("<font color=red size=40>Hello World!</font>")
label.show()
app.exec_()

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This works fine as a standalone PySide2 Qt application. But obviously I cant create another QApplication in my embedded interpreter, because my regular C++ application already does that.
However, just doing

Qt Code:

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label = QLabel("<font color=red size=40>Hello World!</font>")
label.show()

label = QLabel("<font color=red size=40>Hello World!</font>")
label.show()

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doesnt work, which doesnt really surprise me.

Question: How can I make this work?

(Final goal would be to create a docking widget from python, so I would have to make it a child of my QMainWindow, or expose a C++ baseclass to derive from. But that's the next step I guess...)