Packs the elements of a binaryvalued array into bits in a uint8 array.
The result is padded to full bytes by inserting zero bits at the end.
Parameters:  myarray : array_like
axis : int, optional


Returns:  packed : ndarray

See also
Examples
>>> a = np.array([[[1,0,1],
... [0,1,0]],
... [[1,1,0],
... [0,0,1]]])
>>> b = np.packbits(a, axis=1)
>>> b
array([[[160],[64]],[[192],[32]]], dtype=uint8)
Note that in binary 160 = 1010 0000, 64 = 0100 0000, 192 = 1100 0000, and 32 = 0010 0000.