Re: int/long anomaly in jython 2.7.0

Hello Jeff,

thank you for confirming this behaviour and suggesting a workaround. Using long() works perfectly in my case.

Unfortunately i can not register at bugs.jython.org at the moment. At least it hasn't sent me the confirmation e-mail yet.

Mit freundlichen Grüßen
Dr. Hartmut Niemann


Von: Jeff Allen [mailto:[email protected]]
Gesendet: Donnerstag, 26. April 2018 08:58
An: [email protected]; Niemann, Hartmut (MO RS LM EN CCI SRD)
Betreff: Re: [Jython-dev] int/long anomaly in jython 2.7.0


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

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