Find Minimum in Rotated Sorted Array II

class Solution(object):
    def findMin(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        if len(nums) <= 0:
            return 0
        if len(nums) == 1:
            return nums[0]
        size=len(nums)
        left=0
        right=size-1
        while (left<right) and (nums[left] >= nums[right]):
            mid = (left+right)/2
            if nums[mid] > nums[right]:
                left=mid+1
            elif nums[mid] < nums[left]:
                right=mid
            else:
                left+=1
        return nums[left]