How can I sort a dictionary by key?

Question

What would be a nice way to go from {2:3, 1:89, 4:5, 3:0} to {1:89, 2:3, 3:0, 4:5}?
I checked some posts but they all use the "sorted" operator that returns tuples.

Answer 1

Will generate exactly what you want:

 D1 = {2:3, 1:89, 4:5, 3:0}

 sort_dic = {}

 for i in sorted(D1):
     sort_dic.update({i:D1[i]})
 print sort_dic


{1: 89, 2: 3, 3: 0, 4: 5}

But this is not the write way to do this, because, It could show a distinct behavior with different dictionaries , which I have learned recently. Hence perfect way has been suggested by Tim In the response of my Query which I am sharing here.

from collections import OrderedDict
sorted_dict = OrderedDict(sorted(D1.items(), key=lambda t: t[0]))

Answer 2

Python dicts are un-ordered. Usually, this is not a problem since the most common use case is to do a lookup.

The simplest way to do what you want would be to create a collections.OrderedDict inserting the elements in sorted order.

ordered_dict = collections.OrderedDict([(k, d[k]) for k in sorted(d.keys())])

If you need to iterated, as others above have suggested, the simplest way would be to iterate over sorted keys. Examples-

Print values sorted by keys:

# create the dict
d = {k1:v1, k2:v2,...}
# iterate by keys in sorted order
for k in sorted(d.keys()):
    value = d[k]
    # do something with k, value like print
    print k, value

Get list of values sorted by keys:

values = [d[k] for k in sorted(d.keys())]

Answer 3

Or use pandas,

Demo:

>>> d={'B':1,'A':2,'C':3}
>>> df=pd.DataFrame(d,index=[0]).sort_index(axis=1)
   A  B  C
0  2  1  3
>>> df.to_dict('int')[0]
{'A': 2, 'B': 1, 'C': 3}
>>> 

See:

Docs of this

Documentation of whole pandas

Answer 4

l = dict.keys()
l2 = l
l2.append(0)
l3 = []
for repeater in range(0, len(l)):
    smallnum = float("inf")
    for listitem in l2:
        if listitem < smallnum:
            smallnum = listitem
    l2.remove(smallnum)
    l3.append(smallnum)
l3.remove(0)
l = l3

for listitem in l:
    print(listitem)

Answer 5

dictionary = {1:[2],2:[],5:[4,5],4:[5],3:[1]}

temp=sorted(dictionary)
sorted_dict = dict([(k,dictionary[k]) for i,k in enumerate(temp)])

sorted_dict:
         {1: [2], 2: [], 3: [1], 4: [5], 5: [4, 5]}

Answer 6

Simply:

d = {2:3, 1:89, 4:5, 3:0}
sd = sorted(d.items())

for k,v in sd:
    print k, v

Output:

1 89
2 3
3 0
4 5