errNO_handling.py

class OnExc(object):
    def __init__(self, default_val):
        self.default_val = default_val

    def __call__(self, func):
        decorator_self = self

        def decorated_func(*args, **kwargs):
            try:
                return func(*args, **kwargs)
            except:
                error_str = f"Error in {func.__name__}: {sys.exc_info()[1]}"
                if decorator_self.default_val == exit:
                    sys.exit(error_str)
                else:
                    print(error_str)
                    return decorator_self.default_val

        return decorated_func