[Jython-bugs] [ jython-Bugs-1560858 ] range(long, long) doesn't work

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Bugs item #1560858, was opened at 2006-09-18 11:14
Message generated for change (Comment added) made by cgroves
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Category: Core
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Owen O\'Malley (owenomalley)
Assigned to: Charles Groves (cgroves)
Summary: range(long,long) doesn't work

Initial Comment:
The following program fails in jython 2.2a1:

a = long(2)**32
range(a, a+1)

with:

TypeError: range(): 1st arg can't be coerced to int

cPython gets it right:

[4294967296L]


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>Comment By: Charles Groves (cgroves)
Date: 2007-07-29 23:09

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Fixed in r3366 as Leo mentioned in his first comment.  This will still
prevent stuff using range with a value greater than a Java long, but that's
a bigger problem and we can let it wait until someone runs into it.

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Comment By: leouser (leouserz)
Date: 2006-12-20 13:45

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"Note: xrange() is intended to be simple and fast. Implementations may
impose restrictions to achieve this. The C implementation of Python
restricts all arguments to native C longs ("short" Python integers), and
also requires that the number of elements fit in a native C long."

from:
http://docs.python.org/lib/built-in-funcs.html

seems, that there are limits so it seems reasonable that xrange is doing
the right thing.

leouser

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Comment By: leouser (leouserz)
Date: 2006-12-20 13:34

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a first cut at a patch by converting the ints in __builtin__.range(....)

to longs and replacing calls to py2int to py2long appears to solve the
exception.  There is always the possibility of Overflow which will probably
need to be investigated.

Oddly, xrange in python does not work with this value.  I wonder if this
is a bug in xrange and should be implemented to work in jython?

leouser

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