[Python-checkins] cpython (2.7): Issue 22830: Clarify docs for functools.cmp_to_key().
raymond.hettinger
python-checkins at python.org
Mon Nov 10 02:10:32 CET 2014
https://hg.python.org/cpython/rev/dbe1744ec62e
changeset: 93443:dbe1744ec62e
branch: 2.7
parent: 93439:1cde2bbe841a
user: Raymond Hettinger <python at rcn.com>
date: Sun Nov 09 17:10:17 2014 -0800
summary:
Issue 22830: Clarify docs for functools.cmp_to_key().
files:
Doc/library/functools.rst | 11 +++++++----
1 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/Doc/library/functools.rst b/Doc/library/functools.rst
--- a/Doc/library/functools.rst
+++ b/Doc/library/functools.rst
@@ -22,8 +22,8 @@
.. function:: cmp_to_key(func)
- Transform an old-style comparison function to a key function. Used with
- tools that accept key functions (such as :func:`sorted`, :func:`min`,
+ Transform an old-style comparison function to a :term:`key function`. Used
+ with tools that accept key functions (such as :func:`sorted`, :func:`min`,
:func:`max`, :func:`heapq.nlargest`, :func:`heapq.nsmallest`,
:func:`itertools.groupby`). This function is primarily used as a transition
tool for programs being converted to Python 3 where comparison functions are
@@ -32,13 +32,16 @@
A comparison function is any callable that accept two arguments, compares them,
and returns a negative number for less-than, zero for equality, or a positive
number for greater-than. A key function is a callable that accepts one
- argument and returns another value that indicates the position in the desired
- collation sequence.
+ argument and returns another value to be used as the sort key.
Example::
sorted(iterable, key=cmp_to_key(locale.strcoll)) # locale-aware sort order
+ For sorting examples and a brief sorting tutorial, see `Sorting HowTo
+ <https://wiki.python.org/moin/HowTo/Sorting/>`_\.
+
+
.. versionadded:: 2.7
.. function:: total_ordering(cls)
--
Repository URL: https://hg.python.org/cpython
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