from numpy import array
y=array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11])
y.shape = 3,4
y_view=memoryview(y)
y0_view = y_view[0]
# y0_view is not initialized, tolist() will crash:
y0_view.tolist()