Merged revisions 83328,83341 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r83328 | raymond.hettinger | 2010-07-31 12:14:41 +0200 (Sa, 31 Jul 2010) | 1 line Document how to change OrderedDict update order from first to last. ........ r83341 | georg.brandl | 2010-07-31 13:40:07 +0200 (Sa, 31 Jul 2010) | 1 line #9430: document timedelta str() and repr(). ........
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@ -958,3 +958,15 @@ in conjuction with sorting to make a sorted dictionary::
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The new sorted dictionaries maintain their sort order when entries
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are deleted. But when new keys are added, the keys are appended
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to the end and the sort is not maintained.
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It is also straight-forward to create an ordered dictionary variant
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that the remembers the order the keys were *last* inserted.
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If a new entry overwrites an existing entry, the
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original insertion position is changed and moved to the end::
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class LastUpdatedOrderedDict(OrderedDict):
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'Store items is the order the keys were last added'
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def __setitem__(self, key, value):
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if key in self:
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del self[key]
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OrderedDict.__setitem__(self, key, value)
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@ -235,6 +235,14 @@ Supported operations:
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| ``abs(t)`` | equivalent to +\ *t* when ``t.days >= 0``, and|
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| | to -*t* when ``t.days < 0``. (2) |
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+--------------------------------+-----------------------------------------------+
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| ``str(t)`` | Returns a string in the form |
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| | ``[D day[s], ][H]H:MM:SS[.UUUUUU]``, where D |
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| | is negative for negative ``t``. (5) |
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+--------------------------------+-----------------------------------------------+
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| ``repr(t)`` | Returns a string in the form |
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| | ``datetime.timedelta(D[, S[, U]])``, where D |
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| | is negative for negative ``t``. (5) |
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+--------------------------------+-----------------------------------------------+
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Notes:
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@ -250,6 +258,16 @@ Notes:
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(4)
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-*timedelta.max* is not representable as a :class:`timedelta` object.
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(5)
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String representations of :class:`timedelta` objects are normalized
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similarly to their internal representation. This leads to somewhat
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unusual results for negative timedeltas. For example:
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>>> timedelta(hours=-5)
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datetime.timedelta(-1, 68400)
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>>> print(_)
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-1 day, 19:00:00
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In addition to the operations listed above :class:`timedelta` objects support
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certain additions and subtractions with :class:`date` and :class:`datetime`
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objects (see below).
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