Print dict in reverse python

Question

So I have a dict of numbers and strings, like so:

d = {"Hi": None, 2110: 1110, 1110: None}

And I want to print it right to left. Like this:

{1110: None, 2110: 1110, "Hi": None}

How would I go about doing this? If possible I would like to avoid sorting as the dict is already in order, just reverse order, and it seems to me it would take less time to just print it out in reverse than sort it. If I'm wrong, please correct me and sorting is then fine.

dicts are not generally assumed to be in any particular order. — khelwood, Jul 18 '16 at 14:40
First of all dictionary doesn't have any order. If you worry about order please use `orderdict` — Rahul K P, Jul 18 '16 at 14:40
"as the dict is already in order" No, it is not, or just by coincidence. You should probably switch to using `OrderedDict` — tobias_k, Jul 18 '16 at 14:42
yeah I suggest using a different data structure for this, maybe a list of tuples will be better? — RoadRunner, Jul 18 '16 at 14:49
[enter link description here](http://stackoverflow.com/a/483833/6604142) checkout link below. — Q.ali, Jul 18 '16 at 15:00

Ohumeronen · Accepted Answer · 2016-07-18T15:06:32.513

0

You can use the code below to achieve this:

d = {"Hi": None, 2110: 1110, 1110: None}
print str(d)
print '{' + ','.join(str(d)[1:-1].split(',')[::-1]) + '}'

But actually dictionaries don't have any order at all and I think you maybe want to consider to use ordered dictionaries instead.

edited Jul 18 '16 at 15:06

answered Jul 18 '16 at 14:51

Ohumeronen

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This still does not preserve the order. The OP will have to use `OrderedDict` – RoadRunner Jul 18 '16 at 14:53
I added a note in my answer. – Ohumeronen Jul 18 '16 at 14:54

RoadRunner · Answer 2 · 2016-07-18T15:15:12.613

You would have to use OrderedDict from the collections module, and you're starting dictionary would have to be a list of tuples already ordered using OrderedDict, so you can preserve the order of the initial dictionary. This is needed as OrderedDict remembers the order of the keys that are inserted.

from collections import OrderedDict

d = OrderedDict([("Hi", None), (2110, 1110), (1110, None)])

result = OrderedDict(list(d.items())[::-1])
print(result)

Output:

OrderedDict([(1110, None), (2110, 1110), ('Hi', None)]) # remains this order always

Print dict in reverse python

2 Answers2