':return: The % done.
>>> p = Progress()
>>> p.get_progress()
0.0
>>> p.set_total_amount(10)
>>> p.get_progress()
0.0
>>> p.stop()
>>> p.get_progress()
0.0'

def get_progress(self):

    if (self._max_value == 0):
        return 0.0
    return (self._current_value / self._max_value)
