#  此方法适用于排序数组
class Solution:
    def removeDuplicates(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """  
        
        j = 0
        while j < len(nums)-1:
            if nums[j] == nums[j+1]:
                nums.remove(nums[j])
            else:
                j = j + 1
        return len(nums)