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https://github.com/pydata/xarray/issues/1537#issuecomment-326157538 https://api.github.com/repos/pydata/xarray/issues/1537 326157538 MDEyOklzc3VlQ29tbWVudDMyNjE1NzUzOA== 1217238 2017-08-31T00:44:41Z 2017-08-31T00:44:41Z MEMBER

OK, here we go: ``` In [25]: class GoodWrappedArray(object): ...: def init(self, array): ...: self.array = array ...: def array(self, dtype=None): ...: return np.asarray(self.array, dtype) ...: def getitem(self, key): ...: return self.array[key] ...: def len(self): ...: return len(self.array) ...:

In [26]: ind = GoodWrappedArray(np.array([True, False, True]))

In [27]: np.arange(3)[ind] Out[27]: array([0, 2])

In [28]: class BadWrappedArray(object): ...: def init(self, array): ...: self.array = array ...: def array(self, dtype=None): ...: return np.asarray(self.array, dtype) ...: def getitem(self, key): ...: return BadWrappedArray(self.array[key]) ...: def len(self): ...: return len(self.array) ...:

In [29]: ind = BadWrappedArray(np.array([True, False, True]))

In [30]: np.arange(3)[ind] Out[32]: array([], shape=(0, 3), dtype=int64) ```

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