List replace by condition to Empty List Item

[Vikram_Subbaiah]

You could try this workaround
Not very clean though.

def emp (a:var[]..[])
{
	b = [Imperative]
	{
		for (i in a)
		{
			if (i==[])
			{
				return null;
			}
			else
			{
				return i;
			}
		}
	}
	return b == null ? "xx" : b;
};

[ruben.romero]

perfect, empty to Null to variable as well

Null to Empty to Variable

It didn’t work because you have a list with sub-lists, which means that you have to add another loop to iterate the sub-lists as well. So this would be something like: [1] def item_tolist (input): tolist = input if isinstance(input,list) else [input] return tolist var = item_tolist(IN[0]) string = IN[1] result = [] first_lp_list = [] for lst in var: if lst == []: first_lp_list.append(string) result.append(first_lp_list) else: sec_lp_list = [] for item in lst: if item==[]: …

[ruben.romero]

@Vikram_Subbaiah

You could try this workaround

many thanks for the loads of possible solutions, finally I take this like the best option. I modified a script sample of @c.poupin of other post with similar questions to get this solution as well.

the designscript with definition in external code of @Vikram_Subbaiah gets warning telling that “emp” is not defined but it is, although I get result correct but warning and dynamo freezing, not responding for a while, in comparison the python code runs instantly without waiting response, quite tiny in the graph as well.

[c.poupin]

@ruben.romero

I am curious, with DesignScript, is possible to compress that code with few lines? too many “{ }” symbols.

this kind of answer is not acceptable on a forum where you are offered help, and avoid create multiple topics with same questions

How to get help on the Dynamo forums

Here are some more additions. First, do not ask anyone to do your job! This is a help forum to ask for help with things that you cannot figure out on your own, but actually tried. Most important, please remember always come back if anyone is trying to help you. If your graph provides you an error messages, please reveal the content of it as a part of the image. Please put ‘Watch’ nodes and notes in the graph describing what essential parts does. The notes will help you to remember what you did…

[ruben.romero]

@Organon

Try deleting some braces.

I tried to delete some braces but the code block gets a red warning, expecting the brace removed, I am not familiar writting code as this type, many thanks for your solution, it works well.

[Marcel_Rijsmus]

If you want to learn DesignScript, there is lots to download.

DesignScriptDocumentation.pdf (705.5 KB)
designscript-final.pdf (1.5 MB)
DesignScriptGuideV2.1.pdf (343.2 KB)