如何更改dict中键的索引？

Question

I'm using Python 3.7 so dictionnaries are ordered. I have a dict like this: d = { 'a': 10, 'b': 20, 'c': 30} . I want to get: d = { 'a': 10, 'c': 30, 'b': 20,} . I know I can get the index of a key with d.index("a") , but I didn't find a way to change the index.

Answer 1

One option is to use d.items(). This will return a list [('a', 10), ('b', 20), ('c', 30)]. Lists can be easily rearranged however you want. Check out https://www.w3schools.com/python/ref_list_sort.asp

Answer 2

Try using OrderedDict from the collections library. Then you can change the order of the keys by using the move_to_end() method and sort the dictionary however you'd like.

from collections import OrderedDict


data = OrderedDict({'a': 10, 'b': 20, 'c': 30})
print(data.keys())
# output: odict_keys(['a', 'b', 'c'])

data.move_to_end('b')
print(data.keys())
# output: odict_keys(['a', 'c', 'b'])

Answer 3

You should try something like this!

d[newKey] = d[oldKey]
del d[oldKey]

If the key is undefined it will raise an error