python中输出杨辉三角

可以使用嵌套列表来实现输出杨辉三角。以下是一个示例代码：

def generate_pascal_triangle(num_rows):
    triangle = []
    for row_num in range(num_rows):
        # 每一行开始和结尾都是1
        row = [1] * (row_num + 1)
        # 计算中间的数值
        for j in range(1, row_num):
            row[j] = triangle[row_num - 1][j - 1] + triangle[row_num - 1][j]
        triangle.append(row)
    return triangle

# 输出10层的杨辉三角
triangle = generate_pascal_triangle(10)
for row in triangle:
    print(row)

输出结果如下：

[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]