This is an attempt to synthesize Bill and Carsten's proposals.
http://docs.python.org/lib/typesmapping.html: for footnote (3)
Keys and values are listed in an arbitrary order. This order is
indeterminate and generally depends on factors outside the scope of
the
containing program. However, if items(), keys(), values(),
iteritems(), iterkeys(), and itervalues() are called with no
intervening modifications to the dictionary, the lists will directly
correspond.
http://docs.python.org/lib/types-set.html: append a new sentence to 2nd par.
Iteration over a set returns elements in an indeterminate order,
which
generally depends on factors outside the scope of the containing
program.
Alan Isaac
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