On Thu, Nov 27, 2008 at 12:30 PM, mabshoff <[EMAIL PROTECTED]> wrote:
>
>
>
> On Nov 27, 11:24 am, Jason Grout <[EMAIL PROTECTED]> wrote:
>> Ronan Paixão wrote:
>> > I just found a problem with Integer(). It doesn't seem to work fine with
>> > float strings.
>> > Those work fine:
>> > Integer("1")
>> > Integer(1.)
>>
>> > But this doesn't:
>> > Integer("1.")
>>
>> More data:
>>
>> Integer(RR('1.')) works
>> Integer(RR('1.0')) works
>>
>> Integer('1.0') doesn't work
>>
>> I think that at least '1.' ought to be converted to an integer.
>
> Seems like a reasonable request. I would even allow ("$FOO.0"). Care
> to open a ticket?
I strongly disagree, since pure Python does not allow this, and
Sage's string conversion of integers should be consistent with that:
sage: int('1.0')
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/home/was/build/sage-3.2.1.alpha1/<ipython console> in <module>()
ValueError: invalid literal for int() with base 10: '1.0'
sage: int('1.')
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/home/was/build/sage-3.2.1.alpha1/<ipython console> in <module>()
ValueError: invalid literal for int() with base 10: '1.'
sage:
Moreover, Sage integers don't allow coercion from float:
sage: Integer(float(1))
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/home/was/build/sage-3.2.1.alpha1/<ipython console> in <module>()
/home/was/build/sage-3.2.1.alpha1/local/lib/python2.5/site-packages/sage/rings/integer.so
in sage.rings.integer.Integer.__init__ (sage/rings/integer.c:6054)()
TypeError: unable to coerce <type 'float'> to an integer
-- William
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