[Libguestfs] Python bindings : 'GuestFS' object has no attribute 'disk_create'

Hello, I tried to create a disk image using the python-guestfs documentatoin<http://libguestfs.org/guestfs-python.3.html#description&... when i come across "g.disk_create (output, "raw", 512 * 1024 * 1024)" i get an error saying that this function does not exist ! Besides, i tried a ctr+F over the guestfs.py and don't seem to find it. Am i missing something ? Regards,