Dynamo sys.exit()

Revit
1

I am trying to create forms in Dynamo based on user selection, and I want the script to stop executing once the user closes or cancels the form.

Currently, I am using sys.exit() to terminate the script when the user clicks Close or Cancel, but this is causing an error inside the Python node.

I need a proper way to safely stop or exit the script execution in Dynamo when the form is closed or cancelled.

2

What error? If you’re referring to the warning status, this is by design and likely a good thing for you as users may not know why things stopped working without it. I would recommend changing it to sys.exit(“/r/r/tInput form canceled/r/r”) so the reason is clear.

3

Indeed, you are quite right; it is, in fact, a warning.

4

As a workaround, you can implement a ContextManager to manage the workflow with ‘SystemExit’ BaseExceptions .

image
image1917×885 136 KB

import sys
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *

class ErrorContextManager:

    def __init__(self):
        pass
        
    def __enter__(self):
        print("Context Successfully Started")
        return self
        
    def __exit__(self, exc_type, exc_value, exc_tb):
        if exc_type is None:
            print("Successfully Exited From Context\n")
            return False

        if issubclass(exc_type, SystemExit):
            return True  

        line_no = exc_tb.tb_lineno if exc_tb else "unknown"
        error_msg = f"{exc_value} at line {line_no}"
        
        exc_value.args = (error_msg,)
        return False  
        
with ErrorContextManager() as c:
    print(1)
    sys.exit()
    print(2)

OUT = 0

Personally, I handle this using simple if statements