[Tutor] Sorting Dictionary of Dictionary by certain Value
bill at celestial.net
Wed Sep 24 03:09:45 CEST 2008
On Wed, Sep 24, 2008, John Fouhy wrote:
>2008/9/24 Joe Python <jopython at gmail.com>:
>> Hi Pythonistas,
>> I have a large dictionary of dictionary (50,000+ keys) which has a structure
>> as follows:
>> I want to sort the dictionary by 'income'
>> Is there an efficient way to do the same.
>Note that you cannot sort a dictionary. The best you can do is build
>a list containing the dictionary keys in the appropriate order and use
>the dictionary in combination with that list.
What you can do is create a class for the objects in the top
level dictionary, and create a __cmp__ method in that class using
cmp to compare the objects in the dictionary, finally sorting the
def __init__(self, name, income):
self.name = name
self.income = int(income)
def cmp(self, other):
return(cmp((-self.income, self.name), -other.income, other.name))
d = dict(
key1 = MyStuff('john', 10000),
key2 = MyStuff('bill', 20000),
vals = d.values()
# vals should be sorted by income in descending order and name.
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