Leetcode_Python 303 区域和检索 - 数组不可变

class NumArray(object):
    def __init__(self, nums):
        """
        :type nums: List[int]
        """
        self.nums = nums
        self.list = [0]
        for i in range(0,len(self.nums)):
            self.list.append(self.nums[i]+self.list[i])
    def sumRange(self, i, j):
        """
        :type i: int
        :type j: int
        :rtype: int
        """
        return (self.list[j+1]-self.list[i])
# Your NumArray object will be instantiated and called as such:
# obj = NumArray(nums)
# param_1 = obj.sumRange(i,j)