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#!/usr/bin/env python
# -*- encoding: utf-8 -*-

import sys
from PyQt5 import QtWidgets


class Ui_MainWindow(QtWidgets.QDialog):
    def __init__(self, master=None):
        super().__init__()
        self.setupUI()

    def setupUI(self):
        self.setWindowTitle("Printen, was im Edit steht.")
        box = QtWidgets.QVBoxLayout()

        tabWidget = QtWidgets.QTabWidget()
        self.btn_print = QtWidgets.QPushButton("print")
        self.btn_print.clicked.connect(self.print)
        tabelemente = tab()    # creating an object of tabinhalt (instance), has all the functions

        tabWidget.addTab(tabelemente, "Erster Tab")  
        self.editinhalt = tabelemente.getedittext()

        box.addWidget(tabWidget)
        box.addWidget(self.btn_print)

        self.setLayout(box)

    def print(self):
        print(self.editinhalt)


class tab(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()
        self.edit = QtWidgets.QLineEdit(self)
        self.edit.setText("Hallo")

    def getedittext(self):
        return self.edit.text()


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = Ui_MainWindow()
    MainWindow.show()
    sys.exit(app.exec_())

Code: Alles auswählen

def print(self):
        self.editinhalt = self.tabelemente.getedittext()
        print(self.editinhalt)