Show example of how to make a sorted dictionary
This commit is contained in:
parent
890643843d
commit
610326d48a
|
@ -884,3 +884,25 @@ semantics pass-in keyword arguments using a regular unordered dictionary.
|
|||
|
||||
`Equivalent OrderedDict recipe <http://code.activestate.com/recipes/576693/>`_
|
||||
that runs on Python 2.4 or later.
|
||||
|
||||
Since an ordered dictionary remembers its insertion order, it can be used
|
||||
in conjuction with sorting to make a sorted dictionary::
|
||||
|
||||
>>> # regular unsorted dictionary
|
||||
>>> d = {'banana': 3, 'apple':4, 'pear': 1, 'orange': 2}
|
||||
|
||||
>>> # dictionary sorted by key
|
||||
>>> OrderedDict(sorted(d.items(), key=lambda t: t[0]))
|
||||
OrderedDict([('apple', 4), ('banana', 3), ('orange', 2), ('pear', 1)])
|
||||
|
||||
>>> # dictionary sorted by value
|
||||
>>> OrderedDict(sorted(d.items(), key=lambda t: t[1]))
|
||||
OrderedDict([('pear', 1), ('orange', 2), ('banana', 3), ('apple', 4)])
|
||||
|
||||
>>> # dictionary sorted by length of the key string
|
||||
>>> OrderedDict(sorted(d.items(), key=lambda t: len(t[0])))
|
||||
OrderedDict([('pear', 1), ('apple', 4), ('orange', 2), ('banana', 3)])
|
||||
|
||||
The new sorted dictionaries maintain their sort order when entries
|
||||
are deleted. But when new keys are added, the keys are appended
|
||||
to the end and the sort is not maintained.
|
||||
|
|
Loading…
Reference in New Issue