Antoine Pitrou added the comment:
There's also the following code in numpy's getbuffer method:
/*
* If a read-only buffer is requested on a read-write array, we return a
* read-write buffer, which is dubious behavior. But that's why this call
* is guarded by PyArray_ISWRITEABLE rather than (flags &
* PyBUF_WRITEABLE).
*/
if (PyArray_ISWRITEABLE(self)) {
if (array_might_be_written(self) < 0) {
goto fail;
}
}
... which seems to imply that mmap is not the only one with "dubious behaviour"
(?).
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