create ordered dict from list comprehension?

Question

Here is a list comprehension:

L = [{k: d[k](v) for (k, v) in l.iteritems()} for l in L]

where

• L is a list of or

Answer 1

Python dictionary unlike C++ dictionary are unordered because it uses hash for its keys. Analternative would be to use an ordered specialization of python dictionary called collections.OrdredDict.

This would turn your declaration as

from collections import OrderedDict
L = [OrderedDict((k, d[k](v)) for (k, v) in l.iteritems()) for l in L]

Answer 2

collections.OrderedDict is nothing but a dict, which remembers the order in which the elements are included in it. So you can create one with its constructor like this

[OrderedDict((k, d[k](v)) for (k, v) in l.iteritems()) for l in L]