[O] passing the attachment folder to a python source code, how to?

[Piter_]

Hi all.
I am trying to separete files generated by python scripts in different subtrees,
It appeared to me that attachment folder could be used for it.
I should be able to pass a varible to a source code block using header
arguments,
but, now I am a bit pussled how can i get it.
Thank you in advance.
Petro.