Python calculator

# Add your Python code here. E.g.
from microbit import *

number1 = 0
operator = 0
number2 = 0
number3 = 0
state = 1
buttonPressed = 0
buttonPressed2 = 0

addition = Image("00900:"
                 "00900:"
                 "99999:"
                 "00900:"
                 "00900")
subtraction = Image("00000:"
                    "00000:"
                    "99999:"
                    "00000:"
                    "00000")
multiplication = Image("90009:"
                       "09090:"
                       "00900:"
                       "09090:"
                       "90009")
division = Image("00009:"
                 "00090:"
                 "00900:"
                 "09000:"
                 "90000")
modulus = Image("90009:"
                "00090:"
                "00900:"
                "09000:"
                "90009")
exponent = Image("00900:"
                 "09090:"
                 "90009:"
                 "00000:"
                 "00000")




while True:

    if button_b.is_pressed():
        if buttonPressed2 == 0:
            buttonPressed2 = 1
            if state < 4:
                state = state + 1
    else:
        buttonPressed2 = 0

    if state == 1:
        display.show(str(number1))


        if button_a.is_pressed():
            if buttonPressed == 0:
                buttonPressed = 1
                number1 = number1 + 1
        else:
            buttonPressed = 0

        if number1 == 10:
            number1 = 0

    elif state == 2:
        if button_a.is_pressed():
            if buttonPressed == 0:
                buttonPressed = 1
                operator = operator + 1
        else:
            buttonPressed = 0

        if operator == 0:
            display.show(addition)
        elif operator == 1:
            display.show(subtraction)
        elif operator == 2:
            display.show(multiplication)
        elif operator == 3:
            display.show(division)
        elif operator == 4:
            display.show(modulus)
        elif operator == 5:
            display.show(exponent)

        if operator == 6:
            operator = 0

    elif state == 3:
        display.show(str(number2))


        if button_a.is_pressed():
            if buttonPressed == 0:
                buttonPressed = 1
                number2 = number2 + 1
        else:
            buttonPressed = 0

        if number2 == 10:
            number2 = 0

    elif state == 4:
        if operator == 0:
            number3 = number1 + number2
            display.scroll(str(number3))
        elif operator == 1:
            number3 = number1 - number2
            display.scroll(str(number3))
        elif operator == 2:
            number3 = number1 * number2
            display.scroll(str(number3))
        elif operator == 3:
            number3 = number1 / number2
            display.scroll(str(number3))
        elif operator == 4:
            number3 = number1 % number2
            display.scroll(str(number3))
        elif operator == 5:
            number3 = number1 ** number2
            display.scroll(str(number3))

    sleep(1)