Dynamic update of arcpy.AddMessage progress line in dialog box?

Question

I have a lengthy field list and would like the dialog box to show script progress on a single line, rather than returning to a new line.

what I have:
field1
field2
field3 ....

current code:

for fieldName in fieldList.split(';'):
    arcpy.gp.CalculateField_management(inFeature, fieldName, "2")
    arcpy.gp.AddMessage(fieldName)

what I would like:
field1, field2, field3, ...
I don't want to simply list the fields, but keep the list updating with a new field separated by a comma each time on the same line

Answer 1

This is How you will use SetProgressor:

You can try this progress bar functions. May be you need a little modification according to your python versions. So, I donot know that dialog box is possible in arcgis custom tool box. But you can see the progresses in progressbar labels as you expected I hope.

count=1
arcpy.SetProgressor("step","Calculating fields for fieldnew Values", 0, len(fieldList),1)
    field_names=["..."]
    for fieldName in fieldList.split(';'):
        field_name.insert[count-1, fieldName] 
        arcpy.SetProgressorLabel(" Calculating field :{}".format(fieldName))
        arcpy.gp.CalculateField_management(inFeature, fieldName, "2")
        arcpy.SetProgressorLabel("We are done with {}".format(field_names))
        #arcpy.gp.AddMessage(fieldName)

    count=count+1