Backtrader - leverage.py error

1.0 leverage.py error

如果成交後，本金不變，會触發0/self._value error。

2.0 debug

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def next(self):     # Updates the leverage for "dtkey" (see base class) for each cycle     # 0.0 if 100% in cash, 1.0 if no short selling and fully invested     try:         lev = (self._value - self._cash) / self._value     except:         lev = 0     self.rets[self.data0.datetime.datetime()] = lev

　　leverage.py，line 61~74。