The function `org-babel-python-evaluate-session' doesn't process temp
file names with `org-babel-process-file-name' before inserting them into
the Python code blocks. This causes a 'No such file' error when the
executing the code blocks on a remote directory.

The attached patch fixes this issue, allowing compilation of Python
source blocks with a remote directory, such as :dir /ssh:user@server:/.

This is my first patch ever, so please let me know if there's ways I can
improve.

Thanks!
-- 
Christian Vanderwall