How to create an empty 'Array[int]'

ZZ.tang

import array as arr
a=arr.array('i', [1, 2, 3])+(Temp.Ids)
unsupported operand type(s) for +: 'array' and 'Array[int]'

It seems like the types of "arr.array('i', [1, 2, 3]) " and "Temp.Ids" are different.

Pernelle Marone-Hitz

We'd need more info to understand the question. What Ansys product are you using. What is stored in Temp ? What are you trying to do exactly?

ZZ.tang

@Pernelle Marone-Hitz said:
We'd need more info to understand the question. What Ansys product are you using. What is stored in Temp ? What are you trying to do exactly?

I'm using Mechanical 2021 R2.
I want to Initialize a variable which have empty value. Then use a loop to extend the Geo Ids of a named selection into the variable.
But when I try to extend the variable, it seems the data type didn't match.

Temp is defined like this:

Temp=Model.AddNamedSelection()
some code
Temp.Ids
a=arr.array('i', [])
a+Temp.Ids

it returned "unsupported operand type(s) for +: 'array' and 'Array[int]'"

And I also tried below

Temp=ExtAPI.SelectionManager.CurrentSelection
a+Temp.ids

it returned "unsupported operand type(s) for +: 'array' and 'List[int]'

ZZ.tang

@Pernelle Marone-Hitz said:
We'd need more info to understand the question. What Ansys product are you using. What is stored in Temp ? What are you trying to do exactly?

I'm trying to Initialize an empty variable and use a loop to extend this variable with the named selection Ids list.

When I trying to do this I noticed the data type of the "named selection Ids" is 'Array[int]'
and I don't know how to create an empty 'Array[int]'

Pernelle Marone-Hitz

I'm afraid I still don't have enough information to help. What Ansys product are you using ? Mechanical ? Maybe this post will help for ids of entities scoped in named selections: https://discuss.ansys.com/discussion/1309/identify-bodies-in-named-selections-and-make-dedicated-named-selections-for-each?utm_source=community-search&utm_medium=organic-search&utm_term=named+selections