def perform1(self):
try:
if (self.combo1.currentIndex() == 0
or self.combo2.currentIndex() == 0):
QMessageBox.question(self, 'Warning!!',
"Please Choose Valid Choice!",
QMessageBox.NoButton)
else:
country1 = self.combo1.currentText()
country2 = self.combo2.currentText()
year = self.combo3.currentText()
Graphs.Graph3(self, country1, country2, year)
except BaseException as ex:
print(ex)
