[reported upstream] Bug in python range

[robertwb]

%python
class MyInt:
    def __init__(self, n):
        self.n = int(n)
    def __int__(self):
        return self.n

print range(MyInt(2**3), MyInt(2**3+10))
print "here"
print range(MyInt(2**34), MyInt(2**34+10))

Fixed by #9958.

Upstream: Fixed upstream, in a later stable release.

Component: packages: standard

Reviewer: Jason Grout

Issue created by migration from https://trac.sagemath.org/ticket/1159

[robertwb]

comment:1

%python
class MyInt:
    def __init__(self, n):
        self.n = int(n)
    def __int__(self):
        return self.n

print range(MyInt(2**3), MyInt(2**3+10))
print "here"
print range(MyInt(2**34), MyInt(2**34+10))

[mwhansen]

comment:5

I can't find any issue with this. It works correctly for me in both the Python and Sage environments.

[robertwb]

comment:6

I get

Traceback (most recent call last):    print range(MyInt(2**34), MyInt(2**34+10))
  File "/Users/robert/sage/current/local/lib/python2.5/site-packages/sage/server/support.py", line 260, in syseval
    return system.eval(cmd)
  File "/Users/robert/sage/current/local/lib/python2.5/site-packages/sage/misc/python.py", line 21, in eval
    eval(z, globals, locals)
  File "/Users/robert/sage/sage-2.8.11/data/extcode/sage/", line 1, in <module>
    
TypeError: range() integer start argument expected, got instance.

On a 64-bit machine, try

print range(2**64, 2**64+10)
print range(MyInt(2**64), MyInt(2**64+10))

I believe this is a bug in Python, and have reported it here: http://bugs.python.org/issue1533

[mwhansen]

Upstream: Reported upstream. Little or no feedback.

[sagetrac-Koen]

comment:11

Fixed in upstream Python 2.6.6 / Python 2.7 (see issue 1533 linked to above) and fix will also be in Python 3 releases. This needs an upgrade of the Sage Python from 2.6.4 to 2.6.6.

[sagetrac-Koen]

comment:12

Alternative fix to upgrade to Python 2.6.6 would be the upgrade to Python 2.7 from ticket #9958

[jasongrout]

comment:13

Fixed by #9958, when it gets merged (upgrade to python 2.7)

[jdemeyer]

Changed upstream from Reported upstream. Little or no feedback. to Fixed upstream, in a later stable release.

[jdemeyer]

Reviewer: Jason Grout