Hi, In my Cython code a function processes it argument x as follows:
x_arr = PyArray_CheckFromAny( x, NULL, 0, 0, cnp.NPY_ELEMENTSTRIDES | cnp.NPY_ENSUREARRAY | cnp.NPY_NOTSWAPPED, NULL) if x_arr is not x: in_place = 1 # a copy was made, so we can work in place. The logic is of the last line turns out to be incorrect, because the input x can be a class with an array interface: class FakeArray(object): def __init__(self, data): self._data = data self.__array_interface__ = data.__array_interface__ Feeding my function FakeArray(xx), x_arr will point into the content of xx, resulting in unwarranted content overwrite of xx. I am trying to replace that condition with if x_arr is not x and cnp.PyArray_Check(x): # a copy was made, so we can work in place. in_place = 1 if cnp.PyArray_CHKFLAGS(x_arr, cnp.NPY_WRITEABLE) else 0 I am wondering if I perhaps overlooked some case. Thank you, Sasha
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