Widget not able to create new widget ?

[TheJester12121]

Hi guys,

I must be missing something, but what Im trying to do doesnt work.

See here.

import sys

from PyQt5.QtCore import QSize
from PyQt5.QtWidgets import QWidget, QMainWindow, QPushButton, QApplication

class TestApplicationWindow(QWidget):

    def __init__(self, *args, **kwargs):
        QWidget.__init__(self, *args, **kwargs)

        self.resize(QSize(640, 480))
        btn = QPushButton(self)
        btn.setText("Create window")

        btn.clicked.connect(self.create_window)

    def create_window(self):
        print("create_window")

        otherwindow = QWidget()
        otherwindow.resize(QSize(640, 480))
        otherwindow.show()

if __name__ == "__main__":

    print("Starting")

    app = QApplication(sys.argv)

    MainWindow = TestApplicationWindow()
    MainWindow.show()

    sys.exit(app.exec())

Can anyone explain me, why, when I click the button, the 2nd widget (otherwindow) isnt shown ?

[TheJester12121]

Hmmz.... this is it.... https://www.pythonguis.com/tutorials/creating-multiple-windows/
Its created, but discarded.
Thanks all !

[JonB]

@TheJester12121 said in Widget not able to create new widget ?:

otherwindow = QWidget()

This widget has no parent, it is not added to another widget directly or (better) on a layout belonging to parent widget. And no reference is kept to it in e.g. self. Hence Python will destroy it on exit from create_window(). Other languages (e.g. C++) would not. I don't know exactly where in https://www.pythonguis.com/tutorials/creating-multiple-windows/ you claim this precise code came from.