Арифмометр

import sys
 
from PyQt5.QtWidgets import QMainWindow, QApplication, QLabel, QPushButton, QLineEdit
 
 
class Arifmometr(QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.init_ui()
 
    def init_ui(self):
        self.setGeometry(300, 200, 320, 60)
 
        self.first_value = QLineEdit(self)
        self.first_value.setText('0')
        self.first_value.move(10, 10)
 
        self.second_value = QLineEdit(self)
        self.second_value.setText('0')
        self.second_value.move(140, 10)
        
        self.tabel = QLabel(self)
        self.tabel.setText("=")
        self.tabel.move(200, 10)
        self.tabel.resize(30, 30)           
 
        self.result = QLineEdit(self)
        self.result.setEnabled(False)
        self.result.move(250, 10)
 
        self.add_button = QPushButton('+', self)
        self.add_button.move(50, 10)
 
        self.substract_button = QPushButton('-', self)
        self.substract_button.move(80, 10)
 
        self.multiply_button = QPushButton('*', self)
        self.multiply_button.move(110, 10)
 
        self.add_button.clicked.connect(self.addition)
        self.substract_button.clicked.connect(self.subtraction)
        self.multiply_button.clicked.connect(self.multiplication)
 
        self.show()
 
    def addition(self):
        result = float(self.first_value.text()) + float(self.second_value.text())
        self.result.setText(str(result))
 
    def subtraction(self):
        result = float(self.first_value.text()) - float(self.second_value.text())
        self.result.setText(str(result))
 
    def multiplication(self):
        result = float(self.first_value.text()) * float(self.second_value.text())
        self.result.setText(str(result))
 
 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    my_form = Arifmometr()
    my_form.show()
    sys.exit(app.exec())