I pull three strings from three components, and would like to join them together into one CSV string.
Python uses + to concatenate, but that does not work, I get a TypeError: bad operand type for unary + error.
For example:
The plus symbol isn't the problem, your line wrapping is. You need to put all the concatenation on one line, or use a different line ending to tell Python it's all one statement, or use a different mechanism for concatenation entirely. There's a bunch of options, but this is entirely a syntax error.