【Python】简单计算器

#python 3.7.1

print("operation codes are:")
print("1 for multiply")
print("2 for division")
print("3 for addition")
print("4 for subtraction")
num1=int(input("first number here:"))
num2=int(input("second number here:"))
operator=int(input("operation code:"))
while operator is 1:
  print(num1*num2)
  break
while operator is 2:
  print(num1/num2)
  break
while operator is 3:
  print(  num1+num2)
  break
while operator is 4:
  print(  num1-num2)
  break