Commit Graph

8 Commits

Author SHA1 Message Date
Raymond Hettinger 116f72fa5c Bring decimal a bit closer to the spec for Reals. 2008-02-12 01:18:03 +00:00
Raymond Hettinger 19a5c29d27 Fix typo in comments 2008-02-12 00:48:20 +00:00
Raymond Hettinger 48688d8c8e Add notes on how decimal fits into the model. 2008-02-11 22:53:01 +00:00
Jeffrey Yasskin 27d339446a Oops! 2.6's Rational.__ne__ didn't work. 2008-02-08 06:45:40 +00:00
Jeffrey Yasskin b23dea6adb Added more documentation on how mixed-mode arithmetic should be implemented. I
also noticed and fixed a bug in Rational's forward operators (they were
claiming all instances of numbers.Rational instead of just the concrete types).
2008-01-31 07:44:11 +00:00
Jeffrey Yasskin d7b00334f3 Add rational.Rational as an implementation of numbers.Rational with infinite
precision. This has been discussed at http://bugs.python.org/issue1682. It's
useful primarily for teaching, but it also demonstrates how to implement a
member of the numeric tower, including fallbacks for mixed-mode arithmetic.

I expect to write a couple more patches in this area:
 * Rational.from_decimal()
 * Rational.trim/approximate() (maybe with different names)
 * Maybe remove the parentheses from Rational.__str__()
 * Maybe rename one of the Rational classes
 * Maybe make Rational('3/2') work.
2008-01-15 07:46:24 +00:00
Jeffrey Yasskin 9871d8fe22 Continue rolling back pep-3141 changes that changed behavior from 2.5. This
round included:
 * Revert round to its 2.6 behavior (half away from 0).
 * Because round, floor, and ceil always return float again, it's no
   longer necessary to have them delegate to __xxx___, so I've ripped
   that out of their implementations and the Real ABC. This also helps
   in implementing types that work in both 2.6 and 3.0: you return int
   from the __xxx__ methods, and let it get enabled by the version
   upgrade.
 * Make pow(-1, .5) raise a ValueError again.
2008-01-05 08:47:13 +00:00
Jeffrey Yasskin 2f3c16be73 Backport PEP 3141 from the py3k branch to the trunk. This includes r50877 (just
the complex_pow part), r56649, r56652, r56715, r57296, r57302, r57359, r57361,
r57372, r57738, r57739, r58017, r58039, r58040, and r59390, and new
documentation. The only significant difference is that round(x) returns a float
to preserve backward-compatibility. See http://bugs.python.org/issue1689.
2008-01-03 02:21:52 +00:00