When all else fails RTFM:
5.10 Boolean operations
....
"In the context of Boolean operations, and also when expressions are
used by control flow statements, the following values are interpreted as
false: |False|, |None|, numeric zero of all types, and empty strings and
containers (including strings, tuples, lists, dictionaries, sets and
frozensets). All other values are interpreted as true."
--
Bob Gailer
919-636-4239 Chapel Hill, NC
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