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
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