How to tell if an ndarray has a buffer which is mmap? I want to tell apart x and y.
import numpy as np
import mmap
with open("f.dat", "wb+") as f:
f.seek(np.dtype(float).itemsize - 1, 0)
f.write(b'\0')
f.seek(0, 0)
mm = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
x = np.ndarray(-1, buffer=mm)
y = np.zeros(1)
