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

Easy way

a = [('when', 3), ('why', 4), ('throw', 9), ('send', 15), ('you', 1)]
b = ['the', 'when', 'send', 'we', 'us']
c=[] # a list to store the required tuples 
#compare the first element of each tuple in with an element in b
for i in a:
    if i[0] not in b:
        c.append(i)
print(c)