python modules for handling disks and filesystems

["Ahmed Kamal" <email ahmedkamal googlemail com>]

Hi everyone,
I am working on some python code for an upstream project and I will
need to handle disks and filesystems. i.e. "mounting", "umounting",
"querying whether a directory is a mount point", "getting a file
system size" and such ...
Does such a module exist, or do I run shells commands and parse ?