import os
import time


def clear_screen():
    print("Restarting in 2 seconds")
    time.sleep(2)
#    os.system('cls')   # only works on Windows
    os.system('clear')  # works on Linux

def int_input(prompt):
    """Get an integer from the user.

    Doesn't return until an integer is entered.
    """

    while True:
        try:
            return int(input(prompt))
        except ValueError:      # always catch a SPECIFIC exception
            print("Sorry, only integers accepted, try again.")


while True:     # don't need the (...) parentheses
    print("Calculator")

    number = int_input("number 1: ")
    number2 = int_input("number 2: ")

    opt = input("+, -, *, /: ")
    match opt:
        case 'q':
            print("goodbye")
            break
        case '+':
            result = number + number2
        case '-':
            result = number - number2
        case '*':
            result = number * number2
        case '/':
#            if number2 != 0:
#                result = number / number2
#            else:
#                print("Cannot divide by 0")
#                continue
            # this has the same effect as the commented code above
            if number2 == 0:
                print("Cannot divide by 0")
                continue
            result = number / number2
        case _:
            print("Not an allowed operation")
            continue

    print(f"Result: {result}")
    clear_screen()