Convert IRIS DynamicArray to Python list

Question

Question

Ashok Kumar · Aug 4

Hello Community,

How to convert the IRIS %DynamicArray into python list. I got " <THROW>TestDyncArray+1^MyLearn.Pyth.NewClass1.1 *%Exception.PythonException <PYTHON EXCEPTION> 246 <class 'AttributeError'>: <unknown exception data>" error when passing array values to python class.

ClassMethod TestDyncArray()
{
	Do ..DyncArrayInPy([1,2,3,4])
}

ClassMethod DyncArrayInPy(numbers) [ Language = python ]
{
	import iris
	print(type(numbers)) ;<class 'iris.%Library.DynamicArray'> need to be a <class 'list'>
	for num in numbers:
		print(num)
}

Thanks!

Product version: IRIS 2024.1

$ZV: IRIS for Windows (x86-64) 2024.1 (Build 267.2U) Tue Apr 30 2024 16:41:33 EDT

Discussion (3)1

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score 0 · Answer 1 · 2024-08-05T11:46:29-04:00

Hi,

you can use this method to convert an ObjectScript $LIST to a Python list. I'm not sure if this works with %DynamicArray. If not you could try to convert the %DynamicArray to a $LIST first.

set plist = ##class(%SYS.Python).ToList(clist)

https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.cls...

score 0 · Answer 2 · 2024-08-05T12:40:14-04:00

Hello @Tommy Heyding

Thank you for pointing ToList in %SYS.Python It works for $LIST only not for the dynamicarray. Yes I believe the same convert the dynamic array to $LIST and send to the python. I grab the sample from doc

set clist = $lb(123, 456.789, "hello world")
set plist = ##class(%SYS.Python).ToList(clist)

score 2 · Answer 3 · 2024-08-05T15:57:36-04:00

First convert the dynamic array to a Cache List and then the Cache List to Python List - voila the job is done

/// Convert a dynamic array to a Cache List
/// 
ClassMethod ArrayToList(arr)
{
	q:'arr.%Size() $lb()
	s list="", it=arr.%GetIterator()
	while it,it.%GetNext(.key,.val) {
		s typ=arr.%GetTypeOf(key)
		s list=list_$case(typ,"object":$lb(val.%ToJSON()),"array":$lb(..ArrayToList(val)),"null":$lb(),:$lb(val))
	}
	q list
}