Append a nested dictionary to a dictionary in python

Question

I’m trying to append a nested dictionary to a dictionary, I have searched the internet and couldn’t find an answer.

I tried

Colors = {}

a = {"1:1":{255,1,2}}
b = {"2:1":{1,255,2}}
Colors.update(a)
Colors.update(b)

print(Colors)

It prints

{'1:1': {1, 2, 255}, '2:1': {1, 2, 255}}

Instead of

{'1:1': {255,1,2}, '2:1': {1,255,2}}

Asked By: Richard

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Source

Answer 1

The reason the values don’t keep their order is because you’re using sets and not lists. Unlike lists, sets are unordered (you can read more here).
To fix your issue, you can use lists instead (note the {} turned into []:

Colors = {}

a = {"1:1":[255,1,2]}
b = {"2:1":[1,255,2]}
Colors.update(a)
Colors.update(b)

print(Colors)

Which prints:

{'1:1': [255, 1, 2], '2:1': [1, 255, 2]}

Answered By: Adid

Append a nested dictionary to a dictionary in python

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