You can code long script sections such as a class definition.
The rule is: a long script section is started by a
line starting with @ and ending with :,( or one of the
characters that python would recognize that signifies
that there is more to come. You must then indent the code
with exactly one extra space. A long script section
is ended by the first line not having a space character
in column 1 (or the end of file).
The whole of a long script section is collected and then
executed at once.
Errors in script sections are reported with a traceback
but do not halt processing. You cannot terminate an Interscript
processing run inside a script section, not even with sys.exit().