The file src/doc/en/thematic_tutorials/sws2rst.rst says
* Next, you will need an optional package to parse your worksheet. Use the command:: sage -i beautifulsoup but this package no longer exists. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.