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authorGeorg Brandl <georg@python.org>2010-03-14 10:51:01 (GMT)
committerGeorg Brandl <georg@python.org>2010-03-14 10:51:01 (GMT)
commitc0e22b7889a4b8b5002a1ac4ae25273e6d30ea6f (patch)
treeb9223ba25ba501ae2357f0214b79eaad25ae5357 /Doc/whatsnew/2.6.rst
parent1b37e8728c654efe928b9bc028b2f4f5621a35ea (diff)
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Merged revisions 78101,78115,78117,78182,78188,78245,78386,78496 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk ........ r78101 | georg.brandl | 2010-02-08 01:04:54 +0100 (Mo, 08 Feb 2010) | 1 line Fix test_fnmatch. ........ r78115 | georg.brandl | 2010-02-08 23:40:51 +0100 (Mo, 08 Feb 2010) | 1 line Fix missing string formatting placeholder. ........ r78117 | georg.brandl | 2010-02-08 23:48:37 +0100 (Mo, 08 Feb 2010) | 1 line Convert test failure from output-producing to self.fail(). ........ r78182 | georg.brandl | 2010-02-14 09:18:23 +0100 (So, 14 Feb 2010) | 1 line #7926: fix stray parens. ........ r78188 | georg.brandl | 2010-02-14 14:38:12 +0100 (So, 14 Feb 2010) | 1 line #7926: fix-up wording. ........ r78245 | georg.brandl | 2010-02-19 20:36:08 +0100 (Fr, 19 Feb 2010) | 1 line #7967: PyXML is no more. ........ r78386 | georg.brandl | 2010-02-23 22:48:57 +0100 (Di, 23 Feb 2010) | 1 line #6544: fix refleak in kqueue, occurring in certain error conditions. ........ r78496 | georg.brandl | 2010-02-27 15:58:08 +0100 (Sa, 27 Feb 2010) | 1 line Link to http://www.python.org/dev/workflow/ from bugs page. ........
Diffstat (limited to 'Doc/whatsnew/2.6.rst')
-rw-r--r--Doc/whatsnew/2.6.rst14
1 files changed, 8 insertions, 6 deletions
diff --git a/Doc/whatsnew/2.6.rst b/Doc/whatsnew/2.6.rst
index 7c59022..1952032 100644
--- a/Doc/whatsnew/2.6.rst
+++ b/Doc/whatsnew/2.6.rst
@@ -350,9 +350,10 @@ A high-level explanation of the context management protocol is:
* The code in *BLOCK* is executed.
-* If *BLOCK* raises an exception, the :meth:`__exit__(type, value, traceback)`
- is called with the exception details, the same values returned by
- :func:`sys.exc_info`. The method's return value controls whether the exception
+* If *BLOCK* raises an exception, the context manager's :meth:`__exit__` method
+ is called with three arguments, the exception details (``type, value, traceback``,
+ the same values returned by :func:`sys.exc_info`, which can also be ``None``
+ if no exception occurred). The method's return value controls whether an exception
is re-raised: any false value re-raises the exception, and ``True`` will result
in suppressing it. You'll only rarely want to suppress the exception, because
if you do the author of the code containing the ':keyword:`with`' statement will
@@ -463,7 +464,7 @@ could be written as::
with db_transaction(db) as cursor:
...
-The :mod:`contextlib` module also has a :func:`nested(mgr1, mgr2, ...)` function
+The :mod:`contextlib` module also has a ``nested(mgr1, mgr2, ...)`` function
that combines a number of context managers so you don't need to write nested
':keyword:`with`' statements. In this example, the single ':keyword:`with`'
statement both starts a database transaction and acquires a thread lock::
@@ -472,8 +473,9 @@ statement both starts a database transaction and acquires a thread lock::
with nested (db_transaction(db), lock) as (cursor, locked):
...
-Finally, the :func:`closing(object)` function returns *object* so that it can be
-bound to a variable, and calls ``object.close`` at the end of the block. ::
+Finally, the :func:`closing` function returns its argument so that it can be
+bound to a variable, and calls the argument's ``.close()`` method at the end
+of the block. ::
import urllib, sys
from contextlib import closing