problem with variable scoping

[Michael Dingler]

> Your thinking like this is a C or Pascal program.  The assignment of
> last_line_empty creates an instance in the local scope.  It does not
> modify the instance in the enclosing scope.
> 
> Add 'global last_line_empty' at the top of the function and the problem
> should be fixed.

Thanks.
Indeed my background is more towards C and Pascal, and as lots of scripting
languages try to emulate the idiosyncrasies of them, I kinda suspected
Python was doing the same. Well, one never should think that all algol-like
languages are the same ;)

...Michael...