Python Dictionaries to Create New List

Civil3D
,
1

Hi there,

Im trying to create a new list matching my subassembly parameters with a personalized dictionary.

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I try to find an answer in the forum and things like that:

but im still not able to do it (sorry I delete my test, I could repeat if necessary so the problem could be check). This is the dictionary:

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I always have this error: Unhashable XXX. I think I read there was problems with dictionaries in Dynamo, so Im not really sure how could i solve this problem.

Thank in advance

2

Can you show us what you’ve tried? It’s hard to tell you what the problem is if we can see what you’ve done.

3

Hi,

I have this Input:

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This Script:

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Where say dataEnteringNode is actually IN only

And This error:

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PS: I have just basic knowledge of Phyton, I made some scripts but with really explicit guides.

Thanks in advance

4

Change how you are asking for the items out, just supply a single value, not the (n,n).

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5

Hi @SeanP ,

I try like this but still the same problem… Actually my INPUT is a list of lists, dont know if that could affect…

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6

Your inputs don’t appear to be a dictionary either. The first two sublists look the same. The easiest thing to do would be to supply the keys and the values separately or as pairs.

7

Yes, if you have list inputs, then you’d need to iterate those as well while looking to get values.

1 Like
8

hello
try this

OUT = [[dic.get(n) for n in sublist] for sublist in IN[0]]

7 Likes
9

Thanks a lot @c.poupin , that actually works but, can you explain a bit the logic behind this? As I said Im starting with Phyton and some things looks magic for me

10

Hello @manumolina96
it’s a Nested List Comprehensions to keep the structure of the entry list
some explanation here

1 Like
11

Here is an example of what the expanded form would look like:

Lists = IN[0]

output = []

for sublist in Lists:
    newItems =[]
    for item in sublist:
        newItems.append(dic.get(item))
    output.append(newItems)

OUT = output
2 Likes