118_pascalsTriangle.py

class Solution:
    def generate(self, numRows):
        """
        :type numRows: int
        :rtype: List[List[int]]
        """
        lists = []
        for i in range(numRows):
            lists.append([1]*(i+1))
            if (i > 1):
                for j in range(1,i):
                    lists[i][j] = lists[i-1][j-1] + lists[i-1][j]
        return lists