Sorting a dictionary in python

Possible Duplicate:
Python: Sort a dictionary by value

I need to sort by values a original dictionary on a descending order.
As keys I have numbers and as values I have some date and time (string).

This means I have:

{1: '2011-09-25 16:28:18', 2: '2011-09-25 16:28:19', 3: '2011-09-25 16:28:13', 4: '2011-09-25 16:28:25'}

And I want to have:

{4: '2011-09-25 16:28:25', 2: '2011-09-25 16:28:19', 1: '2011-09-25 16:28:18', 3: '2011-09-25 16:28:13'}

Please, look at the times (value). I want to sort the times on a descending order. This means, the most recent time first.

Thanks in advance!

---

import operator
x = { 1: '2011-09-25 16:28:18',
      2: '2011-09-25 16:28:19',
      3: '2011-09-25 16:28:13',
      4: '2011-09-25 16:28:25',
      }
sorted_x = sorted(x.iteritems(), key=operator.itemgetter(1), reverse=True)

print(sorted_x)

这导致（键，值）元组列表：

[(4, '2011-09-25 16:28:25'),
 (2, '2011-09-25 16:28:19'),
 (1, '2011-09-25 16:28:18'),
 (3, '2011-09-25 16:28:13')]

---

Python builtin dict dictionaries aren't ordered, so you cannot do that, you need a different container.

With Python 3.1 or 2.7 you can use collections.OrderedDict. For earlier version see this recipe.

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