Python script unable to take multiple items from list

Revit
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For some reason I couldn’t get multiple item list inputs for the last python script working. While singular input into it works just. Any ideas why this is happening? Thanks

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Any python guru’s got any ideas?

3

The TypeError tells you that you’re giving it a list instead of a string. You’re using a conditional statement to ensure that your revs variable is always a list, but you should try to do a similar approach with your second input.

import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *

clr.AddReference('RevitServices')
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument

def set_description(r, val):
    UnwrapElement(r).Description = val
    return r

revs = IN[0]
new_description = IN[1]
if not isinstance(revs, list): # Ensure revs is always a list
    revs = [revs]
if isinstance(new_description, list): # Ensure new_description is always a string
    new_description = ' '.join(new_description)

TransactionManager.Instance.EnsureInTransaction(doc)
output = [set_description(rev, new_description) for rev in revs]
TransactionManager.Instance.TransactionTaskDone()

OUT = output

I don’t have access to Revit or Dynamo on my personal PC so I haven’t tested the above code, but it should work. I essentially just added an if statement to test whether the new description is a list and, if it is, it will join all of the items into a single string with a space between each item.

If you’re trying to assign a description to each respective Revision, you’ll have to do it slightly differently:

import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *

clr.AddReference('RevitServices')
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument

def set_description(r, val):
    UnwrapElement(r).Description = val
    return r

revs = IN[0]
new_description = IN[1]
if not isinstance(revs, list): # Ensure revs is always a list
    revs = [revs]
if not isinstance(new_description, list): # Ensure new_description is always a list
    new_description = [new_description]

output = []
TransactionManager.Instance.EnsureInTransaction(doc)
for rev, desc in zip(revs, new_description):
    output.append(set_description(rev, desc))
TransactionManager.Instance.TransactionTaskDone()

OUT = output
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