class Solution(object):

    def containsDuplicate(self, nums):

        """

        :type nums: List[int]

        :rtype: bool

        """

        if len(nums) == 0 or len(nums) == 1:

            return False

        return not (len(set(nums)) == len(nums))

class Solution(object):

    def containsDuplicate(self, nums):

        """

        :type nums: List[int]

        :rtype: bool

        """

        hasht = {}

        for num in nums:

            if num not in hasht:

                hasht[num] = True

            else:

                return True

        return False