A python problem about int to long promotion just see the idle session

[gen_tricomi]

Python 2.4.2 (#67, Sep 28 2005, 12:41:11) [MSC v.1310 32 bit (Intel)]
on win32
Type "copyright", "credits" or "license()" for more information.

************************************************** **************
Personal firewall software may warn about the connection IDLE
makes to its subprocess using this computer's internal loopback
interface. This connection is not visible on any external
interface and no data is sent to or received from the Internet.
************************************************** **************

IDLE 1.1.2

import sys
save_maxint = sys.maxint
save_maxint 2147483647 save_maxint += 1
save_maxint 2147483648L save_maxint - 1 2147483647L save_maxint + 1 2147483649L save_maxint - 1 2147483647L save_maxint + 1 2147483649L save_maxint - 1 2147483647L save_maxint + 1

2147483649L
from the above you can see what int to long promotion is causing
i dont need to say much please see for yourself. is this a bug or
a feature.

please mail me if you can help

og*******@yahoo.com

[Fredrik Lundh]

"gen_tricomi" <og*******@yahoo.com> wrote:

IDLE 1.1.2

import sys
save_maxint = sys.maxint
save_maxint 2147483647 save_maxint += 1
save_maxint 2147483648L save_maxint - 1 2147483647L save_maxint + 1 2147483649L save_maxint - 1 2147483647L save_maxint + 1 2147483649L save_maxint - 1 2147483647L save_maxint + 1

2147483649L
from the above you can see what int to long promotion is causing
i dont need to say much please see for yourself.

?

</F>

[Robert Kern]

gen_tricomi wrote:

from the above you can see what int to long promotion is causing
i dont need to say much please see for yourself. is this a bug or
a feature.

This is expected behavior. Why is it problematic for you?

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

[mensanator]

gen_tricomi wrote:

Python 2.4.2 (#67, Sep 28 2005, 12:41:11) [MSC v.1310 32 bit (Intel)]
on win32
Type "copyright", "credits" or "license()" for more information.

************************************************** **************
Personal firewall software may warn about the connection IDLE
makes to its subprocess using this computer's internal loopback
interface. This connection is not visible on any external
interface and no data is sent to or received from the Internet.
************************************************** **************

IDLE 1.1.2

import sys
save_maxint = sys.maxint
save_maxint 2147483647 save_maxint += 1
save_maxint 2147483648L save_maxint - 1 2147483647L save_maxint + 1 2147483649L save_maxint - 1 2147483647L save_maxint + 1 2147483649L save_maxint - 1 2147483647L save_maxint + 1

2147483649L
from the above you can see what int to long promotion is causing

Nope, it's not the promotion causing the problem.
i dont need to say much please see for yourself. is this a bug or
a feature.
Neither. Try changing the "+" and "-" to "+=" and "-=".

please mail me if you can help
"I don't think there can be any question about it.
It can only be attributable to human error.
This sort of thing has cropped up before...
....and it has always been due...
....to human error."
- HAL, 2001: A Space Odessy


og*******@yahoo.com

[gen_tricomi]

wow i think i was just been too paranoid.
i thought it would affect some precision arithmetic in science.
thanks for the reply