flatten tuple

[John Hunter]

>>>>> "holger" == holger krekel <pyth at devel.trillke.net> writes:

    holger> Hello John, because i have related interests i have taken
    holger> the time to write a very small (one screen) and robust
    holger> more general 'SubstDict'. you can use it like this:

Thanks to all for really helpful suggestions.  Duncan's code worked
great -- Bengt's even does the recursive check.  I have upgraded to
2.2, and will study your examples closely to gleam some knowledge from
them.

Thanks again,
John Hunter