Debugging code in Transaction using pyRevit

[imigas434]

Hello, I create new scripts and custom panels/buttons using pyRevit. One of my scripts must simply update parameter of a single room. It seems there is an error, but because it is in Transaction part, I cannot see the error in the output terminal. Revit immediately shuts down pyRevit window and throws an alert that it will rollback transaction because it was not closed.

My question is: how can I properly debug my script in this situation? Can I do anything to stop Revit from throwing this alert?

Following code is my test script. (What is even funnier, if I used with revit.Transaction(sth) from pyrevit module instead of EnsureInTransaction, the script would not throw any error or alert. But I cannot use this method as importing revit from pyrevit is impossible while using CPython 3)

#! python3

import clr
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = __revit__.ActiveUIDocument.Document

room_ref = doc.GetElement('bf8888de-1dca-490a-a125-17b87a35bea6-006b3d62')

def set_parameter_value(element, parameter_name, value):
    param = element.LookupParameter(parameter_name)
    if param:
        return param.Set(value)
    return False

TransactionManager.Instance.EnsureInTransaction(doc)
set_parameter_value(room_ref, '_dyn_sh_MieszkaniePowierzchnia', 5000)
TransactionManager.Instance.TransactionTaskDone()

[jmcouffin]

more suitable for the forum IMHO

see https://danimosite.wordpress.com/2017/05/11/intro-to-transactions/

 TransactionManager.Instance.EnsureInTransaction(doc)
 try:            
     #Make some changes to the Revit Document...
 except Exception as e:
    print(e)
     #Maybe Throw an Error Message...
 TransactionManager.Instance.TransactionTaskDone()