How to rotate bits ?

[korenron]

Hello,
I have a function that take bits and cut them according to my needs

BITS_ORDER_CHANGE = {8: 0, 7: 1, 6: 2, 5: 3, 4: 4, 3: 5, 2: 6, 1: 7}

def GetBits(Byte, start, end):  # bits order 8765 4321 , str order 0123 4567
    Final_calculation = round((int(Byte, 16) * 1 + 0), 0)
    bits = "{0:b}".format(Final_calculation)
    Full_bits = bits.zfill(8)
    print('old start', start)
    start = BITS_ORDER_CHANGE[start]
    print('new start', start)
    print('old end', end)
    end = BITS_ORDER_CHANGE[end]
    print('new end', end)
    Wanted_bits = Full_bits[end:start]
    return Wanted_bits

my problem is that when I cut it I think is string mode , whie the bits are is in bits mode
so it's other way around

for example
if I take "CA"
in bits its - 1100 1010
I want to cut only bits 2-4
but I need to enter numbers 4-7

then I thought to use dictionary - but then it's went wrong
I need to change the order - (end - start) , and it also change the order of the bits
01 - change to 10

is there other way to do it? without overthinking what need to be cut?


Thanks,