Python位数组操作

Question

I want to remove the least significant 2 bits of every 16-bit integer from a bitarray. They're stored like this:

010101**00**10010101101100**00**10101010.....

(The zeroes between the asterisks will be removed. There are two of them every 16 bits (ignoring the very first)).

I can simply eliminate them with a regular for loop checking indexes (the 7th and 8th after every 16 bits).

But... is there another more pythonic way to do this? I'm thinking about some slice notation or maybe comprehension lists. Perhaps I could divide every number by 4 and encode every one with 14 bits (if there's a way to do that).

Answer 1

You can clear bits quite easily with masking. If you want to clear bits 8 and 7 you can do it like this:

a = int('10010101101100',2)
mask = ~((1 << 7) | (1 << 8))
bin(a&mask)

more information about masking from here!