Re: [Jython-dev] int/long anomaly in jython 2.7.0

[Jeff A. <ja...@fa...>]

Not AFAIK, thanks for finding it. It's still in the development tip:

>>> x = int(-(1<<31))
>>> y = x + 1
>>> x, y
(-2147483648, -2147483647)
>>> x.__format__('d') # Oops
'--2147483648'
>>> y.__format__('d')
'-2147483647'

Almost certainly there is some thinking error in int.__format__(), which 
% relies on, handling the positive of -2^31, which has no representation 
as an int. A work-around is to make it a long:

>>> '%d' % long(x)

'-2147483648'

The right place for this is http://bugs.jython.org/ . You could open an 
issue there (so you'll get e-mail when we work on it), or I will do so 
eventually.

Jeff Allen

On 25/04/2018 08:05, Niemann, Hartmut wrote:
>
> Hello!
>
> Is this a known bug in Jython 2.7.0?
>
> x = int(-(1<<31))
>
> print ('%d' % x)
>
> results in
>
> --2147483648
>
> With two ‘-‘ signs.
>
> For -(1<<31)+1 everything is fine,
>
> for -(1<<31)-1 the resulting x has type long and everything is fine as 
> well.
>
> convert x to long and the result is correct as well.
>
> Mit freundlichen Grüßen
> Dr. Hartmut Niemann
>
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