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python重写C语言经典100例

'''
【程序61】
题目：打印出杨辉三角形（要求打印出10行如下图）　　　
1.程序分析： 
'''

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(a[i][j])
            stdout.write(' ')
        print