No Module "sage.all" or no module Pyfits

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Hello to all. I am trying to execute a python script on ubuntu with python 2.6. I would like to use two aditionnal module in the script sage and pyfits. But if i add the command line: from sage.all import *, i get the message no module named sage.all. I try to add, at the beginning of the script the line #!/usr/bin/env sage -python and now he found the sage module but not the module pyfits. Do you know how to have in both time the two modules ? Thanks in advance to all the answers. Any help will be sincerely appreciated. Cheers