LintCode Python 101. 删除排序数组中的重复数字 II

def removeDuplicates(self, nums):
    # write your code here
    if nums == []:
        return 0
    index,count = 0, 1
    for i in range(1, len(nums)):
        if nums[index] == nums[i] and count < 2:
            index += 1
            count += 1
            nums[index] = nums[i]
        if nums[index] != nums[i]:
            index += 1
            count = 1
            nums[index] = nums[i]
    return index+1