Tableau Prep Builder - TabPy configuration in a V1 credentials.json

 The Tableau Prep Builder credentials.json documentation suggests that for a V1 credentials.json, all you need to specify for TabPy support is the password, if any exists. If you do this with a flow that you created using a recent version of Tableau Prep Builder, though, you'll get a ton of errors stating that some field names do not exist, even if the flow functions perfectly from within Prep Builder itself.

Buried within those errors is likely one that indicates that the TabPy configuration is invalid. I originally assumed that Prep Builder saved the TabPy configuration I had entered into the flow itself, but this is not the case. So, the TabPy configuration info isn't in the flow file, and the documentation doesn't indicate how you should enter this info into a V1 credentials.json, so what do you do?

It turns out that you can apparently mix and match parts of the V1 and V2 configurations just fine. The V1 configuration has no way to provide a server hostname and port number, but the V2 configuration does, e.g.:

{

"extensions": {

    "extensionName": "pythonSupport",

    "regular": {

        "host": "localhost",

        "port": "9004"

    }

}

This can happily sit next to a V1 "inputConnections" section. With the V2 extension configuration entered into the credentials.json file, the flow will run correctly.