[Tutor] Shifting arrays as though they are a 'word'

Steven D'Aprano steve at pearwood.info
Sat Oct 6 02:42:58 EDT 2018

On Fri, Oct 05, 2018 at 04:17:53PM -0400, Chip Wachob wrote:
> Hello,
> I was not able to find any answers in the archive on this one.
> I'm wondering if this task can be done in a better way than what I've
> attempted..
> I have an array of bytes.  Up to 64, which makes for 512 bits.
> I am reading these bytes in serially, and once I have a collection of
> them, I want to shift them by 'n' bits.  The size of the array and the
> number of bits are both variable up to the limit of 64/512.

Code speaks much more strongly than description. Can you demonstrate an 
example of:

- the actual data you have;
- the result you want;
- what you've tried?

The answers we give will be very different according to what you have, 

data = [0, 1, 2, 3, 4, 5, 6, 7]  # eight bytes in a list
data = b"\0\x01\x02\x03\x04\x05\x06\x07" # eight bytes in a bytes object
data = 0x0001020304050607  # eight bytes in an int


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