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.

1 files changed, 4 insertions, 7 deletions

diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index 3236ccd..0133e5c 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -986,13 +986,10 @@ available.  They are listed here in alphabetical order.
 .. function:: round(x[, n])
 
    Return the floating point value *x* rounded to *n* digits after the decimal
-   point.  If *n* is omitted, it defaults to zero.  Values are rounded to the
-   closest multiple of 10 to the power minus *n*; if two multiples are equally
-   close, rounding is done toward the even choice (so, for example, both
-   ``round(0.5)`` and ``round(-0.5)`` are ``0``, and ``round(1.5)`` is
-   ``2``). Delegates to ``x.__round__(n)``.
-
-   .. versionchanged:: 2.6
+   point.  If *n* is omitted, it defaults to zero. The result is a floating point
+   number.  Values are rounded to the closest multiple of 10 to the power minus
+   *n*; if two multiples are equally close, rounding is done away from 0 (so. for
+   example, ``round(0.5)`` is ``1.0`` and ``round(-0.5)`` is ``-1.0``).
 
 
 .. function:: set([iterable])