> >>> seq = [1,2] > > >>> seq.extend((3,4))
OK, this feature is referenced in the Python Library reference here : https://docs.python.org/3.2/library/stdtypes.html#typesseq-mutable not thoroughly referenced but, anyway, referenced. > > >>> seq+= {5, 6} # the order of extending is not determined > > >>> seq > > [1, 2, 3, 4, 5, 6] > > >>> Good and interesting observation. But I can't find out where this feature is referenced in the Language/Library Reference. Because, as my first post explains, augmented assignment performs the binary operation associated to the augmented assignment, cf. https://docs.python.org/3.2/reference/simple_stmts.html#augmented-assignment-statements so seq+= {5, 6} performs seq + {5, 6}, the later raising a TypeError. -- https://mail.python.org/mailman/listinfo/python-list
