\envvar{PYTHONHOME} sets an alternate value for the prefix of the
Python installation. For example, if \envvar{PYTHONHOME} is set to
\samp{/www/python}, the search path will be set to \code{['',
-'/www/python/lib/python2.2/', '/www/python/lib/python2.3/plat-linux2',
-...]}.
+'/www/python/lib/python\shortversion/',
+'/www/python/lib/python\shortversion/plat-linux2', ...]}.
The \envvar{PYTHONPATH} variable can be set to a list of paths that
will be added to the beginning of \code{sys.path}. For example, if