Pascal Triangle II

def getRow(self, rowIndex):
        :type rowIndex: int
        :rtype: List[int]
        if rowIndex == 0:
            return [1]
        numRows = rowIndex + 1
        previous = [1]
        answer = None
        for x in range(2, numRows+1):
            row = [1]*x

            # Mutate the row
            for y in range(1, x-1):
                #print("x={} y={} row={} prev={}".format(x, y, row, previous))
                row[y] = previous[y-1]+ previous[y]
            del previous
            # Update previous and possible answer
            previous = row
            answer = row
        return answer

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