Python 练习实例61
题目:打印出杨辉三角形(要求打印出10行如下图)。
程序分析:无。
实例
#!/usr/bin/python # -*- coding: UTF-8 -*- if __name__ == '__main__': a = [] for i in range(10): a.append([]) for j in range(10): a[i].append(0) for i in range(10): a[i][0] = 1 a[i][i] = 1 for i in range(2,10): for j in range(1,i): a[i][j] = a[i - 1][j-1] + a[i - 1][j] from sys import stdout for i in range(10): for j in range(i + 1): stdout.write(str(a[i][j])) stdout.write(' ') print
以上实例输出结果为:
1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1 1 7 21 35 35 21 7 1 1 8 28 56 70 56 28 8 1 1 9 36 84 126 126 84 36 9 1