[O] Trouble exporting inline code blocks

[Richard Stanton]

Here’s a very simple org file:

————

Some inline Python code: 2 plus 2 is src_python[:session]{2+2}

————-

If I put the cursor on the code block and type C-c C-c, I get  nice results 
block containing the answer, 4. So far so good.

I’d like to export just the results to PDF via LaTeX. However, no matter what 
options I pass, the exported PDF file shows both the source and the output. 
E.g.,

src_python[:session :exports results]{2+2}
src_python[:session :exports none]{2+2}

Am I missing something? Thanks. By the way, I’m using org mode v. 9.0.5. 

Richard Stanton