x = input('Please select 1 (Celsius) or 2 (Fahrenheit): ') print(x) y = input('Please input the temperature: ') print(y) y0 = int(y) if x == '1': print('Celsius {} degree = Fahrenheit {} degree'.format(y, 9*y0/5+32)) elif x == '2': print('Fahrenheit {} degree = Celsius {} degree'.format(y, 5*(y0-32)/9)) else: print('select error')