diff options
Diffstat (limited to 'Doc/whatsnew/2.6.rst')
| -rw-r--r-- | Doc/whatsnew/2.6.rst | 21 |
1 files changed, 8 insertions, 13 deletions
diff --git a/Doc/whatsnew/2.6.rst b/Doc/whatsnew/2.6.rst index 5cf29cb..203091f 100644 --- a/Doc/whatsnew/2.6.rst +++ b/Doc/whatsnew/2.6.rst @@ -1324,14 +1324,6 @@ The most general ABC is :class:`Number`. It defines no operations at all, and only exists to allow checking if an object is a number by doing ``isinstance(obj, Number)``. -Numbers are further divided into :class:`Exact` and :class:`Inexact`. -Exact numbers can represent values precisely and operations never -round off the results or introduce tiny errors that may break the -commutativity and associativity properties; inexact numbers may -perform such rounding or introduce small errors. Integers, long -integers, and rational numbers are exact, while floating-point -and complex numbers are inexact. - :class:`Complex` is a subclass of :class:`Number`. Complex numbers can undergo the basic operations of addition, subtraction, multiplication, division, and exponentiation, and you can retrieve the @@ -1449,13 +1441,15 @@ Here are all of the changes that Python 2.6 makes to the core Python language. it will be returned if *iterator* has been exhausted; otherwise, the :exc:`StopIteration` exception will be raised. (:issue:`2719`) -* Tuples now have an :meth:`index` method matching the list type's - :meth:`index` method:: +* Tuples now have :meth:`index` and :meth:`count` methods matching the + list type's :meth:`index` and :meth:`count` methods:: >>> t = (0,1,2,3,4) >>> t.index(3) 3 + (Contributed by Raymond Hettinger) + * The built-in types now have improved support for extended slicing syntax, where various combinations of ``(start, stop, step)`` are supplied. Previously, the support was partial and certain corner cases wouldn't work. @@ -1545,7 +1539,8 @@ Here are all of the changes that Python 2.6 makes to the core Python language. * :func:`~math.sum` adds up the stream of numbers from an iterable, and is careful to avoid loss of precision by calculating partial sums. - (Contributed by Jean Brouwers; :issue:`2819`.) + (Contributed by Jean Brouwers, Raymond Hettinger, and Mark Dickinson; + :issue:`2819`.) * The inverse hyperbolic functions :func:`~math.acosh`, :func:`~math.asinh` and :func:`~math.atanh`. @@ -1596,8 +1591,8 @@ Here are all of the changes that Python 2.6 makes to the core Python language. * The string :meth:`translate` method now accepts ``None`` as the translation table parameter, which is treated as the identity transformation. This makes it easier to carry out operations - that only delete characters. (Contributed by Bengt Richter; - :issue:`1193128`.) + that only delete characters. (Contributed by Bengt Richter and + implemented by Raymond Hettinger; :issue:`1193128`.) * The built-in :func:`dir` function now checks for a :meth:`__dir__` method on the objects it receives. This method must return a list |