Raymond Hettinger added the comment:
Thanks Terry.
And yes, your reading of the set.update() docs is correct, "Update the set,
adding elements from all others" means that it updates the set by adding the
elements from the other sets.
FWIW, getting into details about "which value wins" goes against the core
concept of the data structure. Sets (in a mathematical sense) are about
treating elements of an equivalence class as being identical. We intentionally
treat {1, 1.1} as being of length one and equal to {1.1, 1} eventhough the
integer 1 and the float 1.0 are actually distinguishable in ways not tested by
equality.
This isn't just a concept with sets. The dict.update() method works similarly
as does other container operations that depend on a notion of equivalence that
is independent of other distinctive traits (object identity, attached values,
type, etc).
----------
resolution: -> invalid
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20902>
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