On Mon, Feb 17, 2020 at 3:40 AM Mark Dickinson <[email protected]> wrote:
>
> ananthakrishnan15.2001ï¼ gmail.com wrote:
> > binary.twos_complement(0b0011)==1101
> > binary.twos_complement(0b00000011)==11111101
>
> How would you make that possible, when `0b0011` and `0b00000011` are the
> exact same integer?
Easy: you simply have 0b1101 and 0b11111101 actually be display
phenomena. Both of them represent -3 in a particular field size.
Unfortunately the built-in bin() function doesn't take a width
argument, but you can easily create that:
def binary(n, width=None):
if width: return format(n & (1<<width) - 1, "0%db" % width)
return format(n, "b")
Now you can ask for any number's binary representation in a field of N
bits, negative numbers included.
With that added, you can now use Python's ordinary integers. In fact...
import sys
sys.displayhook = lambda val: print(binary(val, 8)) if type(val) is
int else print(val)
Tada! Now your REPL works with eight-bit binary values.
ChrisA
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