Tim <jtim.arn...@gmail.com> 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.
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Ben Finney
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