Problem with tool validation script in ArcGIS?

Question

I have tried to write some validation code for a script in ArcGIS. This validation code more or less repeats what the script itself does, which is a simple cutting up of a long string by using the Python "split" string method, and then using each of the outcomes to define some parameters. This works great for most variables here, but for some reason the params 2 and 6 are being set to the full original string when I review the validation results in the ModelBuilder window by hovering over the variable. I have no idea why this is happening. Both of these parameters are defined as String output on the script. There is one more string output variable here (params 8), that displays a good value, and the only difference I see is the extra "replace". I have even tried to hard code the values for params 2 and 6, by setting it directly equivalent to a string, but to no avail, it still showed the full original unsplitted string.

What am I missing?

def updateParameters(self):
"""Modify the values and properties of parameters before internal
validation is performed.  This method is called whenever a parameter
has been changed."""
    self.params[1].value = self.params[0].value.split(';')[0]
    self.params[2].value = self.params[0].value.split(';')[1]
    self.params[3].value = self.params[0].value.split(';')[2]
    self.params[4].value = self.params[0].value.split(';')[3]
    isExportFeatureClassStr = self.params[0].value.split(';')[4]

    if isExportFeatureClassStr == "True":
        isExportFeatureClass = True
        flowControlBoolean = False
    else:
        isExportFeatureClass = False
        flowControlBoolean = True

    self.params[5].value = isExportFeatureClass
    self.params[6].value = self.params[0].value.split(';')[5]
    self.params[7].value = flowControlBoolean
    self.params[8].value = self.params[0].value.split(';')[6].replace(",",";")

return

Answer 1

I have tested it like this:

  def updateParameters(self):
    ValuesStr = self.params[0].value
    Values = ValuesStr.split(';')

    self.params[1].value = Values[0]
    self.params[2].value = Values[1]
    self.params[3].value = Values[2]
    self.params[4].value = Values[3]
    isExportFeatureClassStr = Values[4]

    if isExportFeatureClassStr == "True":
      isExportFeatureClass = True
      flowControlBoolean = False
    else:
      isExportFeatureClass = False
      flowControlBoolean = True

    Val6 = Values[6]
    Val6 = Val6.replace(",",";")

    self.params[5].value = isExportFeatureClass
    self.params[6].value = Values[5]
    self.params[7].value = flowControlBoolean
    self.params[8].value = Val6

    return

with the test string:

zero numeric value;one value one;two is two;three tripple 3;True;five of six;seven, and end of param, for now;

And it works just fine...

As replace(",",";") modifies the string it's best to separate it out by making it a string and not a string in a list.