martin v löwis qpnyslvloewisde jason orendorff wrote tue apr 1 2008 937 pm martin v löwis wrote think fairly obvious 2x keys change wasteful actually build list keys dictionary even values create tuples well want iterate common operation keys iterate look right dont think use case dkeys write k see subject say ditems framing question iterate vs copy seems bogus like view vs copy thing copying provides semantics want course dont want extra helpings aliasing spooky interaction collections nuts slowness never bothered methat know views would faster silently different semantics think want copying think zero chance revert decision regards martin _______________________________________________ python3000 mailing list python3000pythonorg httpmailpythonorgmailmanlistinfopython3000 unsubscribe httpmailpythonorgmailmanoptionspython3000python300040tangomucom thu 07 aug 2008 080046 0200 python3000 spooky behavior dictitems friends