How to print unsorted dictionary in python?

Question

I have this dict in python;

d={} d['b']='beta' d['g']='gamma' d['a']='alpha' 

when i type dict;

 for k,v in d.items(): print k 

I get this:

 a b g 

it looks like python is sorting the dict automatically! How can I get the original unsorted list?

Gough

Answer 1

Dictations do not work like this:

CPython implementation details . Keys and values ​​are listed in random order, which is nonrandom, varies in different Python implementations, and depends on the history of inserting and deleting dictionaries.

Instead, you can use a list with 2 roots:

 d = [('b', 'beta'), ('g', 'gamma'), ('a', 'alpha')] 

A similar but better solution is described in the Wayne answer .

Answer 2

As already mentioned, dicts does not order or order the elements you insert. This is “magic” as to how it is ordered when it is received. If you want to keep the order sorted or not, you also need to bind a list or tuple.

This will give you the same dict result with a list that keeps order:

 greek = ['beta', 'gamma', 'alpha'] d = {} for x in greek: d[x[0]] = x 

Just change [] to () if you don't need to change the original list / order.

Answer 3

Do not use a dictionary. Or use the Python 2.7 / 3.1 OrderedDict .

Answer 4

No dictionaries in dictionaries, no original unsorted list.

Answer 5

No, python does not sort the dict, it would be too expensive. The order of items() arbitrary. From python docs:

CPython implementation details: Keys and values ​​are listed in an arbitrary order, which is not accidental, varies through the Python implementation and depends on the history of the insert and delete dictionaries.