On Thursday, April 30, 2015 at 1:05:05 PM UTC-4, Ben Finney wrote:
> Tim writes:
> > You can use 'extend' to add set elements to a list and use 'update' to
> > add list elements to a set.
>
> And you can use both of those methods to add items from a file::
>
> >>> foo = ['one', 'two']
> >>> bar = open('/usr/share/common-licenses/GPL-3')
> >>> foo.extend(bar)
> >>> foo
> ['one', 'two', ' GNU GENERAL PUBLIC LICENSE\n',
> ' Version 3, 29 June 2007\n', '\n',
> ...
>
> You have merely discovered that 'list.extend' and 'set.update' accept an
> iterable <URL:https://wiki.python.org/moin/Iterator>.
>
> Sets and lists and files and many other collections are all iterables,
> so any of them can be passed to a function that accepts an iterable.
Thanks for the answers, that makes perfect sense.
It sure is useful too.
--Tim
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