Question

Say I have a list v = [1, 2, 3, 4, 3, 1, 2]. I want to write a function, find_pair which will check if two numbers are in the list and adjacent to each other. So, find_pair(v, 2, 3) should return True, but find_pair(v, 1, 4) should return False.

Is it possible to implement find_pair without a loop?

Answer 1

v = [1,2,3,4,3,1,2]
any([2,3] == v[i:i+2] for i in xrange(len(v) - 1))

While @PaoloCapriotti’s version does the trick, this one is faster, because it stops parsing the v as soon as a match is found.