Finding intersection/difference between python lists

Question

I have two python lists:

a = [(\'when\', 3), (\'why\', 4), (\'throw\', 9), (\'send\', 15), (\'you\', 1)]

b = [\'the\', \'when\', \'send\', \'we\', \'us\']
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Answer 1

Use filter:

c = filter(lambda (x, y): False if x in b else True, a)