Bug in Python large negative literal assignment?

Roman Suzi rnd at onego.ru
Mon May 14 07:55:22 CEST 2001


On Sun, 13 May 2001, Keith Dart wrote:

That is because 2147483648 can not be represented by
32 bits ;-)

Python constructs numbers by operations:

-2147483648 - is the result of "-" operation
on 2147483648 number.

> I seem to have found a bug in how Python assigns the largest negative
> literal:
> 
> Python 2.1 (#1, Apr 23 2001, 15:49:36) 
> [GCC 2.95.1 19990816/Linux (release)] on linux2
> Type "copyright", "credits" or "license" for more information.
> Sourcing .pythonrc...
> Python> # I cannot assign the following:
> .more.. i = -2147483648
> OverflowError: integer literal too large
> Python> # however, I can do it the following ways:
> .more.. i = -sys.maxint-1
> Python> i
> -2147483648
> Python> i = 0x80000000
> Python> i
> -2147483648
> Python> i = -2147483647 ; i = i - 1
> Python> i
> -2147483648
> Python> i = -2147483647-1
> Python> i
> -2147483648
> Python> i = -2147483648
> OverflowError: integer literal too large
> 
> But, no, can't assign a max negative number as decimal literal.
> 
> 
> 
>                            \\|//
>                            (O O)
> -- --------------------oOOo~(_)~oOOo----------------------------------------
> Keith Dart
> <mailto:kdart at kdart.com>
> <http://www.kdart.com/>
> ----------------------------------------------------------------------------
> Ever since my brain transplant I ...
> ============================================================================
> 
> 

Sincerely yours, Roman A.Suzi
-- 
 - Petrozavodsk - Karelia - Russia - mailto:rnd at onego.ru -
 





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