When I try to set the level for Duct fitting or pipe fitting using python, I'm getting a error saying the parameter is read only, can someone help me with this

Developers
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1

Kindly see the below snip for more info.

image
image1503×637 68.3 KB

Python Script:

elements = UnwrapElement(IN[0])
Level  = UnwrapElement(IN[1])
#Do some action in a Transaction
TransactionManager.Instance.EnsureInTransaction(doc)
for element in elements:
	Param = element.LookupParameter("Level")
	SetValue = Param.Set(Level.Id)


TransactionManager.Instance.TransactionTaskDone()

OUT = element

Error I got “IronPythonEvaluator.EvaluateIronPythonScript operation failed.
Traceback (most recent call last):
File “”, line 47, in
Exception: The parameter is read-only.”

2

The LookupParameter() method returns the first match it finds. In this case, DuctFitting elements actually have two “Level” parameters. The first one is the schedule level, which is read-only, and the second is the associated level that you’re looking for.

To get the specific parameter that you’re after, you can use the BuiltInParameter method instead.
element.get_Parameter(BuiltInParameter.FAMILY_LEVEL_PARAM)

If you use the standard Dynamo nodes this would get handled automatically.

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3

I know dynamo nodes gives better result but I’m working on a bigger script in which this was the small portion where I got the error, so I have just concentrate on the error to get the answer. Thanks anyway, I didn’t know this. If you can explain how to set the this BuiltInParameter.FAMILY_LEVEL_PARAM with different Element Id it would be helpful.

Thanks

4

The issue was that you were collecting the wrong parameter. That line will get you the correct parameter that you can then write to like any other parameter.

5

It is working thanks