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Python how to iterate through a list and compare lists of strings found within

原文 2010-11-06 00:07:47 2 2 python/ iteration/ nested-lists

If I have a nested list that looks like this:

bigstringlist = [['rob', 'bob', 'sam', 'angie'], ['jim', 'angie', 'tom', 'sam'], ['sam', 'mary', 'angie', 'sally']]

How do I iterate through this list and extract a list of names that appear in all the nested lists? ie:

finallist = ['sam', 'angie']

Would this be better accomplished by typecasting this nested list as a set?

2 answers

reduce(set.intersection, map(set , bigstringlist))

A variation on singularity's solution, maybe a little faster:

bigstringiter = iter(bigstringlist)
reduce(set.intersection, bigstringiter, set(next(bigstringiter)))

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