用python打印十行杨辉三角形

以下是使用Python编写的打印十行杨辉三角形的代码：

def pascal_triangle(n):
    triangle = [[1]]
    for i in range(1, n):
        row = [1]
        for j in range(1, i):
            row.append(triangle[i-1][j-1] + triangle[i-1][j])
        row.append(1)
        triangle.append(row)
    return triangle

def print_pascal_triangle(n):
    triangle = pascal_triangle(n)
    for row in triangle:
        print(" ".join(str(num) for num in row).center(n*3))

print_pascal_triangle(10)

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