Determines if a list of integers are seqential (n,n+1,n+2, etc..)

sort_sequential.py

def _sequential_ints(self, item_vals):
        prev = 0
        result = False
        item_vals.sort()
        for i in item_vals:
            if prev > 0:
                if i - prev != 1:
                    break
            prev = i
        else:
            result = True

        return result