Invert particular bits in a byte array

Asked May 23 '21 at 19:18

Active May 23 '21 at 20:23

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what is the fastest way to invert particular bits in all of the bytes within a byte array? I want to invert bits on these positions 0b00110011. Now I am doing it this way but for long array it's pretty slow.

for i in range(len(byte_array_np)):
    byte_array_np[i] &= 0x77
    byte_array_np[i] ^= 0x33

Thank you for sugestions.

edited May 23 '21 at 20:23

wjandrea

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asked May 23 '21 at 19:18

Peter Hrčka

2

How about just `byte_array_np &= 0x77; byte_array_np ^= 0x33`? – Rotem Shalev May 23 '21 at 20:31
1

What's with the AND? You only need XOR to invert, no? – wjandrea May 23 '21 at 20:38

Invert particular bits in a byte array

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