[Tutor] List intersect

[Pawel Kraszewski]

Hello!

 I guess it may be done like this:

>>> import sets
>>> a=sets.Set()
>>> a=a.union(['a','b','c'])
>>> print a
Set(['a', 'c', 'b'])
>>> a=a.union(['b','c','d'])
>>> print a
Set(['a', 'c', 'b', 'd'])

So, for the price of loosing original order of items, we have pretty intuitive 
usage. 'Set' keeps one copy of item, no matter how many times added.


Oh, by the way - 'list intersect' is a common part of intersecting lists (the 
result would be just ['b','c']). You are talking of list union. Being a 
teacher I couldn't resist. :)


Hope it helps.

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 Pawel Kraszewski                                FreeBSD/Linux

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