On Thu, Mar 29, 2018 at 11:56 AM, Nils Bruin <nbr...@sfu.ca> wrote:
> On Thursday, March 29, 2018 at 10:37:03 AM UTC-7, William wrote:
>>
>>
>> It's surprisingly easy to implement this, due to how Robert Bradshaw
>> rewrote this part of the Sage preparser. If you define this
>> function in a notebook or command line sage session:
>>
>> def RealNumber(s):
>> if '.' not in s:
>> return QQ(s)
>> a = s.split('.')
>> return ZZ(a[0]) + ZZ(a[1])/10^len(a[1])
>>
>> then all real number literals will be interpreted as exact rationals!
>>
> Cool! it does require slightly more complicated string mangling to work in
> general, though:
>
> sage: 1.3e5
> TypeError: unable to convert '3e5' to a rational
Thanks -- I should have added that the above was a quick "proof of concept".
William
--
William (http://wstein.org)
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