用python打印杨辉三角

下面是用 Python 打印杨辉三角的代码：

def print_pascal_triangle(n):
    triangle = []
    for i in range(n):
        row = []
        for j in range(i+1):
            if j == 0 or j == i:
                row.append(1)
            else:
                row.append(triangle[i-1][j-1] + triangle[i-1][j])
        triangle.append(row)
    for row in triangle:
        print(' '.join([str(elem) for elem in row]))

# 测试
print_pascal_triangle(5)

输出结果：

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1