#This is just a handy function that clears the screen on windows.
import os
clear = lambda: os.system('cls')

def invert(x):
    result = 1/x  # Raises a ZeroDivisionError if x is 0
    print('Never printed if x is 0')
    return result

def invert_safe(x):
    try:
        return invert(x)
    except ZeroDivisionError as e:
        return str(e)