Chris Angelico <ros...@gmail.com>: > In that case, an 'Exact' non-integer will have appalling performance - > fractions.Fraction doesn't really work all that nicely when the > numbers start getting huge.
In Scheme, any math operation is allowed to drop exactness: If one of these procedures is unable to deliver an exact result when given exact arguments, then it may either report a violation of an implementation restriction or it may silently coerce its result to an inexact number. <URL: http://www.schemers.org/Documents/Standards/R5RS/HTML/r5r s-Z-H-9.html#%_sec_6.2.3> Now, that's neither the recommendation nor the reality; exactness is preserved at the expense of efficiency. However, that's unlikely to be an issue in the normal use of Python's Decimal. Marko -- https://mail.python.org/mailman/listinfo/python-list
