From a6cfeb4b9d7ff1e46388f30b75b9304437964eb7 Mon Sep 17 00:00:00 2001 From: Raymond Hettinger Date: Sun, 16 Mar 2008 05:20:42 +0000 Subject: Update docs to reflect removal of Exact/Inexact --- Doc/library/numbers.rst | 30 ++++-------------------------- 1 file changed, 4 insertions(+), 26 deletions(-) diff --git a/Doc/library/numbers.rst b/Doc/library/numbers.rst index 7a5f105..3124121 100644 --- a/Doc/library/numbers.rst +++ b/Doc/library/numbers.rst @@ -8,9 +8,8 @@ The :mod:`numbers` module (:pep:`3141`) defines a hierarchy of numeric abstract -base classes which progressively define more operations. These concepts also -provide a way to distinguish exact from inexact types. None of the types defined -in this module can be instantiated. +base classes which progressively define more operations. None of the types +defined in this module can be instantiated. .. class:: Number @@ -19,27 +18,6 @@ in this module can be instantiated. *x* is a number, without caring what kind, use ``isinstance(x, Number)``. -Exact and inexact operations ----------------------------- - -.. class:: Exact - - Subclasses of this type have exact operations. - - As long as the result of a homogenous operation is of the same type, you can - assume that it was computed exactly, and there are no round-off errors. Laws - like commutativity and associativity hold. - - -.. class:: Inexact - - Subclasses of this type have inexact operations. - - Given X, an instance of :class:`Inexact`, it is possible that ``(X + -X) + 3 - == 3``, but ``X + (-X + 3) == 0``. The exact form this error takes will vary - by type, but it's generally unsafe to compare this type for equality. - - The numeric tower ----------------- @@ -79,7 +57,7 @@ The numeric tower .. class:: Rational - Subtypes both :class:`Real` and :class:`Exact`, and adds + Subtypes :class:`Real` and adds :attr:`Rational.numerator` and :attr:`Rational.denominator` properties, which should be in lowest terms. With these, it provides a default for :func:`float`. @@ -239,4 +217,4 @@ forward and reverse instances of any given operator. For example, __add__, __radd__ = _operator_fallbacks(_add, operator.add) - # ... \ No newline at end of file + # ... -- cgit v0.12