[PyQt] Send data between windows Pyqt5 and Qt Designer

[Alfalfa]

Use PyQt signal and slot mechanism. Something like this:

import sys
from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyQt5.QtWidgets import QDialog


class Window2(QDialog):
    signal = QtCore.pyqtSignal(str)

    def __init__(self):
        super().__init__()
        uic.loadUi("/home/ewcia/PycharmProjects/Designer_ui/okno2.ui",self) #link to window 2
        self.pushButton.clicked.connect(self.akcja2)


    pyqtSlot()
    def akcja2(self):
        new_adres= self.lineEdit.text()
        self.signal.emit(new_adres)
        # How to add this new address to Mywindow


#---------------------------------------------------------------------------------------------------------

class Mywindow(QtWidgets.QMainWindow):
    def __init__(self):
        super(Mywindow,self).__init__()
        uic.loadUi("/home/ewcia/PycharmProjects/Designer_ui/okno1.ui", self) #link to open okno 1 on my disk

        self.pushButton.clicked.connect(self.akcja1)

    def akcja1(self):
        #print("druga akcja Drugie Okno")
        self.okno2 = Window2()
        self.okno2.signal.connect(self.slot)
        self.okno2.show()

    QtCore.pyqtSlot(str)
    def slot(self, addr):
      print(addr)



if __name__== "__main__":
    import sys
    app=QtWidgets.QApplication(sys.argv)
    window=Mywindow()
    window.show()
    sys.exit(app.exec_())