ant
ant copied to clipboard
copy and paste sagecode
be able to copy and paste sagecell code if you want to run it from the electronic version of the book.
comment on each code block a description and identifier label
see http://stackoverflow.com/questions/3527578/latex-listings-package-copy-pastable-listings
try this too http://www.monperrus.net/martin/copy-pastable-listings-in-pdf-from-latex