[Python-Dev] Unary minus bug (original) (raw)

Neal Norwitz nnorwitz at gmail.com
Mon Jul 10 00:02:06 CEST 2006

Do we care about this (after your checkin and with my fix to make 32-63 bit values ints rather than longs):

64 bit box

minint = str(-sys.maxint - 1) minint '-9223372036854775808' eval(minint) -9223372036854775808 eval('-(%s)' % minint[1:]) -9223372036854775808L

n

On 7/9/06, Neil Schemenauer <nas at arctrix.com> wrote:

The bug was reported by Armin in SF #1333982:

the literal -2147483648 (i.e. the value of -sys.maxint-1) gives a long in 2.5, but an int in <= 2.4. I have a fix but I wonder if it's the right thing to do. I suppose returning a long has the chance of breaking someone code. Here's the test we currently have for a related case: [...] # 32-bit machine allonebits = '0xffffffff' self.assertEqual(eval(allonebits), 4294967295L) self.assertEqual(eval("-" + allonebits), -4294967295L) I guess I would add self.assertTrue(isinstance(eval("-2147483648"), int)) to that set of tests. Neil

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