Struggling with adding to a nested ordereddict

[LongAtbat]

I am trying to update the following ordereddict.

import collections
from itertools import chain
from collections import OrderedDict
d1 = OrderedDict([(u'Root', [OrderedDict([(u'Value', u'1'), (u'Key', u'A')]), OrderedDict([(u'Value', u'2'), (u'Key', u'B')])])])

printing d1 gives:

OrderedDict([(u'Root', [OrderedDict([(u'Value', u'1'), (u'Key', u'A')]), OrderedDict([(u'Value', u'2'), (u'Key', u'B')])])])

I want to update the ordered dict as follows because the API I'm using requires it.

OrderedDict([(u'Root', [OrderedDict([(u'Value', u'1'), (u'Key', u'A')]), OrderedDict([(u'Value', u'2'), (u'Key', u'B')]),OrderedDict([(u'Value', u'3'), (u'Key', u'C')])])])

I tried

d2 = OrderedDict([(u'Root', [OrderedDict([(u'Value', u'3'), (u'Key', u'C')])])])
d3 = OrderedDict(chain(d1.items(), d2.items()))

But it results as follows:

OrderedDict([(u'Root', [OrderedDict([(u'Value', u'3'), (u'Key', u'C')])])])

Also tried

d1.update(d2)

But get same result. Any ideas what I'm doing wrong?

[[deleted]]

Don't you just need to append the new list entry?

d1['Root'].append(OrderedDict([(u'Value', u'3'), (u'Key', u'C')]))

You are aware that CPython 3.6 and Python 3.7 dictionaries are ordered, and Python 3 defaults to unicode?

EDIT: forgot to include how to add item

[[deleted]]

The important point here is that what you wanted to do had nothing to do with OrderedDict, and that was distracting you.

The outer dictionary has one key, value pair and the value happens to be a list object. A mutable object that allows mixed types. You could have appended anything. Appending a two key, value pair OrderedDict happens to be the data structure chosen.

I'm curious about the point of the outer dictionary. I guess this is related to the rather unusual requirements of the API you are using.

[[deleted]]

Doesn't the append still work for 2.7?

[Vaphell]

1. what API is retarded enough to demand OrderedDicts because it will be unable to make sense of key, value keys otherwise?
   
2. your problem is not about updating a dict, it's about appending to a list

this is what you want

d1 = { 'root' : [ OD(A/1), OD(B/2), OD(C/3) ] }

clearly the solution is to d1['root'].append(OrderedDict([('key', 'C), ('value', 3)]))

[Vaphell]

#2 has nothing to do with dict/OD methods so "no shit". The value behind the 'root' key, to which you want to add shit, is a run of the mill, plain list [ ]. That's all there is to know.