pyqt에서 다중 상속을 할 수 없다고 합니다. 그래서 예제 코드에서 self.qLineEdit1 = QLineEdit() 값을 self.test1.qLineEdit1.setText('임의의값') 값으로 변경하고 싶은데 어떻게 해야가능한지 궁금합니다.

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

class test1(QWidget):
    def __init__(self):
        super().__init__()
        self.resize(200, 200)
        self.gridLayout = QGridLayout(self)
        self.qLineEdit1 = QLineEdit()
        self.qLineEdit2 = QLineEdit(self)
        self.qLineEdit1.setPlaceholderText('test1')
        self.qLineEdit2.move(0,150)
        self.gridLayout.addWidget(self.qLineEdit1, 0, 0)

class test2(QWidget):
    def __init__(self):
        super().__init__()
        self.test1 = test1()
        self.test1.qLineEdit1.setText('sdfsdf')
        self.test1.qLineEdit2.move(100,150)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = test1()
    main.show()
    sys.exit(app.exec_())