#calculater first virson
#2022/10/10
#kumar amrit
# coding: utf-8
import os

y = '1'
while y == '1':
    os.system('clear')

    print('''
      + ADD
      - SUBTRACT
      * MULTPLY
      / DIVIDE
      ls
      ''')
  

    num1=int(input("Enter the value1:-"))
    num2=int(input("Enter the value2:-"))
    opr=input("Enter the opr..(+,-,*,/)")
    if opr=="+":
        print(num1+num2)
    elif opr=="-":
        print(num1-num2)
    elif opr=="*":
        print(num1*num2)
    elif opr=="/":
        print(num1/num2)
    else:
        print("invalid opr....")
   
    y = input('\n\t 計算を  1: 続ける　other:やめる\n')
print('thanks')

実行結果