scale.py 文件源码

def limits(self):
        if self.is_empty():
            return (0, 1)

        # Fall back to the range if the limits
        # are not set or if any is None or NaN
        if self._limits is not None and self.range.range is not None:
            limits = []
            if len(self._limits) == len(self.range.range):
                for l, r in zip(self._limits, self.range.range):
                    value = r if pd.isnull(l) else l
                    limits.append(value)
            else:
                limits = self._limits
            return tuple(limits)
        return self.range.range