Running external Python file as a subwindow

[JayCee]

Thanks for your feedback, Axel. But what I need is the external file second_win to open inside the mdiArea of win...

[Axel_Erfurt]

The principle is the same.

win.py

from PyQt5.QtWidgets import QMainWindow, QApplication, QAction, QMdiArea
from PyQt5.QtGui import QIcon
import second_win

class MainWin(QMainWindow):
    def __init__(self, parent = None):
        super(MainWin, self).__init__(parent)
        self.setupUI()
        
    def setupUI(self):
        self.setGeometry(0, 0, 600, 400)
        self.mdi_area = QMdiArea()
        self.file_tool_bar = self.addToolBar("File")
        self.my_action = QAction(QIcon.fromTheme("folder"), "", triggered = self.show_second_win)
        self.file_tool_bar.addAction(self.my_action)
        self.setCentralWidget(self.mdi_area)
        
    def show_second_win(self):
        print("open second win")
        self.sw = second_win.SecondWin()
        self.sw.setFixedSize(400, 300)
        self.mdi_area.addSubWindow(self.sw)
        self.sw.show()


if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    win = MainWin()
    win.setWindowTitle("Main Window")
    win.show()

    sys.exit(app.exec_())

[JayCee]

Of course. Thanks.

[ndc85430]

You really don't need to quote the previous post in its entirety; it just wastes space.

Your code is already difficult to maintain (and test!): use of global variables, no separation of concerns (database code is mixed in with UI code, for example).