Python实现"加一"的两种方法

def plusOne(self, digits):
        """
        :type digits: List[int]
        :rtype: List[int]
        """
        extra = 0  #进位
        one = 1    #加一
        digits = digits[::-1]
        for index, num in enumerate(digits):
            if num+one+extra == 10:     #判断是否进位
                extra = 1
                one = 0
                digits[index] = 0
            else:     #不进位就直接输出
                digits[index] = num+one+extra
                return digits[::-1]
        digits.append(1)
        return digits[::-1]

def plusOne(self, digits):
        """
        :type digits: List[int]
        :rtype: List[int]
        """
        sum = 0
        for index, num in enumerate(digits):
            sum += num*(10**(len(digits)-index-1))
        sum += 1
        new_list = []
        for i in str(sum):
            new_list.append(int(i))
        return new_list