[Python-Dev] Deprecation warning on integer shifts and such
Guido van Rossum
Mon, 12 Aug 2002 09:18:52 -0400
> I'm very much in favor of this change but a deprecation warning is not
> enough - some suitable replacement should be provided to cryptographers
> and other bit fiddlers.
You can do all the bit fiddling you want using longs already. If you
want the result truncated to n bits, simply apply a mask after each
operation, e.g. (for 32-bit results) x = (x << 14) & 0xffffffff.
> A standard module implementing the types [u]int[8|16|32|64]. These types
> would behave just like C integers - wrap around on overflow, etc and have
> a guaranteed size regardless of platform. They can even have methods for
> bit rotation.
If you propose this as a Python module, I'm +/- 0; I don't have the
need, and I feel you can do all of this already, but I can see that
there may be one or two things that beginners at bit-fiddling might
find useful (like how to do sign extension or sign folding without an
If you were proposing a C module, an emphatic YAGNI accompanies a -1.
--Guido van Rossum (home page: http://www.python.org/~guido/)