Second largest

Return the second-biggest distinct value. Duplicates of the maximum don't count, so [5, 5, 4] gives 4, not 5.

One clean route: drop duplicates with set(...), sort the result, and take the value one in from the end with [-2].

Write second_largest(xs) that returns the second-largest distinct value in xs. You may assume there are at least two distinct values.

def second_largest(xs):
    # the second-largest distinct value
    return 0

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