use tempfile.Tempfile instead of os.devnull if file DNE, 'r', and not FILE_MODE
use tempfile.Tempfile instead of os.devnull if file DNE, 'r', and not FILE_MODE


git-svn-id: df3a7ed15ef7bc1bd4e913d3c8231ba6def0a9e6@722 8bfda07e-5b16-0410-ab1d-fd04ec2748df

wxiang7/dill,mindw/dill