On Thu, Apr 30, 2015 at 10:07 AM, Tim <jtim.arn...@gmail.com> wrote: > I noticed this today, using Python2.7 or 3.4, and wondered if it is > implementation dependent: > > You can use 'extend' to add set elements to a list and use 'update' to add > list elements to a set.
It's not implementation dependent. Both methods are documented as accepting arbitrary iterables. The same is also true for the other foo_update set methods (and is generally true of built-ins). It is *not* true for the operator versions of the set methods, however (|, -, &, ^). It's also true for dict.update, except that in this case if an iterable is passed instead of a map, then each element of the iterable must be a 2-element iterable. -- https://mail.python.org/mailman/listinfo/python-list
