Does Python need a '>>>' operator?

[Martin v. Loewis]

David Eppstein <eppstein at ics.uci.edu> writes:

> >>> 0x40000000<<1
> -2147483648
> 
> This is inconsistent with int-long unification.  In fact, I think it is 
> a bug.  The answer should, of course, be 2147483648L, just as you would 
> get by multiplying by 2 instead of shifting.

Indeed, if you write

>>> 0x40000000L<<1
2147483648L

it works the way you expect it to work. Please see

http://www.python.org/peps/pep-0237.html

Python has currently completed phase A of the PEP, meaning that
operations that previously raised an OverflowError now return a long;
nothing else has changed.

Notice that your example is the historic meaning of shift; in phase
B.1, it will change to the arithmetic meaning (multiplication with
2). Since this is a semantic change, you'll get a warning if you make
use of a short int shift that loses a bit.

Regards,
Martin