Python sort dictionary items by value then by key

Question

I have the following dictionary:

{1: (8, 3), 0: (8, 0), 2: (2, 3), 3: (2, 0)}

I would like to sort it by the tuple key and then by the key of the dictionary so the above will be:

 [{1: (2, 3), 3: (2, 0),0: (8, 3), 1: (8, 0)}]

I wrote the following:

result_list = sorted(codebook.items(), key= lambda item: item[1][0])

This sort by the tuple key but not afterwards by the dictionary key.

How can I do it?

Your output would be a list, not a dictionary; dictionaries are unordered. — Martijn Pieters
– Martijn Pieters, Commented Jan 8, 2014 at 18:17
Its a little unclear what you're trying, but if you're trying to sort the dictionary, stop, it cannot be done. Dictionaries in python are not sorted (and cannot be sorted) — wnnmaw
– wnnmaw, Commented Jan 8, 2014 at 18:17
Also, your sample dictionary has two keys that are the same. This can't possibly be correct. — user2555451
– user2555451, Commented Jan 8, 2014 at 18:18
I fixed my question there is already a correct answer to accept i — Dejell
– Dejell, Commented Jan 8, 2014 at 18:22

Joran Beasley · Accepted Answer · 2014-01-08 19:20:14Z

5

sorted(codebook.items(), key= lambda item: (item[1][0],item[0]))

this will sort first by the first item in the tuple then by the dictionary key

just to clarify a few things for OP

Dictionaries are not sortable, so you cannot ever have a "sorted" dictionary
- (there is a OrderedDictionary, but its essentially the same as a NamedTuple, both of these containers do have an order)
This will return a list of tuples not a dictionary. the return will look like

[(dictionary_key,(tuple,values)),(dictionary_key,(tuple,values),...]

edited Jan 8, 2014 at 19:20

answered Jan 8, 2014 at 18:17

Joran Beasley

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7 Comments

That1Guy Over a year ago

I'm also curious about the -1. +1 to make up for it.

Robᵩ Over a year ago

I'm not the -1, but this answer doesn't produce the OP's desired result, a list containing one sorted dict. In fact, no answer possibly can.

Dejell Over a year ago

It's exactly what I wanted - to sort the dictionary

Joran Beasley Over a year ago

meh thats based on the authors incorrect wording of his desired solution ... I think this answers what he actually was asking

Robᵩ Over a year ago

@Dejel , one cannot sort a dictionary, and that isn't what this answer does. I'm glad you found an answer the works for you, but I'm concerned that you are still confused about what this does.

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