Longest Consecutive Sequence

class Solution(object):
    def longestConsecutive(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        nums = set(nums)
        result = 0
        for i in nums:
            if i-1 not in nums:
                current = i
                temp = 1
                while current + 1 in nums:
                    temp+=1
                    current +=1
                result = temp if temp>result else result
        return result