Generate config file from template using Python search and replace.

[Mr Zaug]

That makes sense. 

So I still can't see how to write the string object to a file whist naming the file with whatever values I provided for the NNN and BRAND variables.

Printing the contents of the string object is working with all the expected substitutions. Do I need to convert the string object into a file before I write it? Or do I need to open a new file and somehow stuff the string object into it?