oo

from PyQt5.uic import loadUi
from PyQt5.QtWidgets import QApplication

def calculer():
    a=(w.x.text())
    b=(w.y.text())
    if (a=="") or (b==""):
        QMessageBoxwarning("veuiller saisir des valeur")
    elif not(a.isdecimal() and b.isdecimal()):
        QMessageBoxwarning("veilller saisir des valeurs numériques")
    elif not((w.br1.isChecked()) or (w.br2.isChecked()) or (w.br3.isChecked()) or (w.br4.isChecked())):
        QMessageBoxwarning("veiller cocher une case")
    elif w.br1.isChecked():
        c=int(a)+int(b)
        w.r.setText(str(c))
    elif w.br2.isChecked():
        c=int(a)-int(b)
        w.r.setText(str(c))
    elif w.br3.isChecked():
        c=int(a)*int(b)
        w.r.setText(str(c))
    elif w.br4.isChecked():
        c=int(a)/int(b)
        w.r.setText(str(c))
app = QApplication([])
w = loadUi ("Interface.ui")
w.show()
w.b1.clicked.connect (calculer)

app.exec_()