[Tutor] strange variable problem

[Alan Gauld]

> However further down in def add(...) (err I didn't think this was
> important  :-[ ) I do have a single
> ftseptr+=1
>
> I guess this is the same as ftseptr=ftseptr+1, an assignment

Yep, that'd explain it!

> PS next time I will paste all the code ... even is it is a bit
unwieldy !

Fragments are OK, but at least check the fragment to check it actually
exhibits the same problem! :-)

Alan G.