Dictionary in python with order I set at start

from collections import OrderedDict

d = OrderedDict()
d["server"] = "mpilgrim"
d["database"] = "master"
d['mynewkey'] = 'mynewvalue'

print(d)

OrderedDict([('server', 'mpilgrim'), ('database', 'master'), ('mynewkey', 'mynewvalue')])

Dictionary are unordered (the order is deterministic, but depends on a handful of factors you don't even think of and shouldn't care about - hash of the keys, order of insertion, collisions, etc). In Python 2.7+, use collections.OrderedDict. If you must use an older version, there are various implementations google can point you to.

If you are using python 3.6 dictionaries are now ordered by insertion order

https://www.python.org/dev/peps/pep-0468/

Otherwise (as other people have said) I would recommend collections.OrderedDict

Your dictionnary is not quite reverted. It is sorted partly according to the hash of you keys. You can't change this order (not without using a custom dictionary). In python 2.7 or later you can use an ordered dictionary (collections.OrderedDict).

In earlier version you can use the following recipe.

Also have a look at this question : What is the best ordered dict implementation in python?