human
I am working on the file "41_Progress.ipynb".
The first task is:
A Reusable class for IPython Progress
There currently are too many caveates with out support for Abort. Let us create a reusable class which will automatically generate the UUID and just display the progress.
Can you write Python program for it?
 What is a the Python program you requested?
assistant
#Here is the Python program you requested.

import uuid
from IPython.display import HTML, Javascript, display

class HTMLProgressWatcher:
    def __init__(self, po):
        self.processObject = po
        self.abort = False
        
        po.AddCommand(sitk.sitkStartEvent, lambda: self.cmdStartEvent() )
        po.AddCommand(sitk.sitkProgressEvent, lambda: self.cmdProgressEvent() )
        po.AddCommand(sitk.sitkEndEvent, lambda: self.cmdEndEvent() )
        
    def cmdStartEvent(self):
        global sitkIPythonProgress_UUID
        self.abort=False
        self.divid = str(uuid.uuid4())
        
        try:
            sitkIPythonProgress_UUID[self.divid] = self
        except NameError:
            sitkIPythonProgress_UUID = {self.divid: self}
        
        html_progress_abort="""
<p style="margin:5px">{0}:</p>
<div style="border: 1px solid black;padding:1px;margin:5px">
  <div id="{1}" style="background-color:blue; width:0%%">&nbsp;</div>
</div>
""".format(self.processObject.GetName(), self.divid)
        
        display(HTML(html_progress_abort+javascript_abort))
    
    def cmdProgressEvent(self):
        p = self.processObject.GetProgress()
        display(Javascript("$('div#%s').width('%i%%')" % (self.divid, int(p*100))))
        if self.abort:
            self.processObject.Abort()
    
    def cmdEndEvent(self):
        global sitkIPythonProgress_UUID
        del sitkIPythonProgress_UUID[self.divid]
        del self.divid

filter.RemoveAllCommands()
watcher  = HTMLProgressWatcher(filter)

filter.Execute()

threading.Thread.start?