How to mask action faster in Python3

Question

I am using below function for millions of time in read/write sqlitedb . And it is now a major bottleneck . How I can make it faster for similar result ? I compiled it to module so but still slower part .

BEST

def mask_np(byt):
    # Use same function in both directions.  Input and output are bytes
    # objects.
    mask = b'maskstringtoserve'
    lmask = len(mask)
    return bytes(c ^ mask[i % lmask] for i, c in enumerate(byt))

Answer 1

Solution is to use numpy:

def mask_numpy(val: bytes) -> bytes:
    arr = np.frombuffer(val, dtype=np.int8)
    length = len(value)
    np_mask = np.tile(np.frombuffer(mask, dtype=np.int8),       round(length/mask_length+0.5))[:length]
    masked = arr ^ np_mask
    return masked.tobytes()