TestComplete does not support the "None" value for a variable in Python Script in Keyword Test.
For example the "Null" value for a variable in VB Script is supported as the following sample.
https://support.smartbear.com/testcomplete/videos/?utm_source=TestComplete&utm_medium=StarterPage
Working With A Null Value In Data Driven Testing
I hope TestComplete will support this feature in the future.
