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Continue rolling back pep-3141 changes that changed behavior from 2.5. This

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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.
This commit is contained in:
Jeffrey Yasskin 2008-01-05 08:47:13 +00:00
parent f7476c4d46
commit 9871d8fe22
13 changed files with 75 additions and 252 deletions
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Doc/reference/expressions.rst
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@ -801,8 +801,7 @@ were of integer types and the second argument was negative, an exception was
raised).
Raising ``0.0`` to a negative power results in a :exc:`ZeroDivisionError`.
Raising a negative number to a fractional power results in a :class:`complex`
number. (Since Python 2.6. In earlier versions it raised a :exc:`ValueError`.)
Raising a negative number to a fractional power results in a :exc:`ValueError`.
.. _unary: