打印出杨辉三角形（要求打印出10行如下图）。
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#!/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] = 1a[i][i] = 1for 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 stdoutfor i in range(10):
for j in range(i + 1):
stdout.write(str(a[i][j]))stdout.write(' ')print
程序源代码：
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] = 1a[i][i] = 1for 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 stdoutfor 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
打印出杨辉三角形（要求打印出10行如下图）。
