def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def __init__(self, duration_secs):
    self._start_time_secs = time.time()
    self._duration_secs = duration_secs