从列表中创建矩阵

def create_matrix_from_list(lst):
    rows = len(lst)
    cols = max(len(row) for row in lst)
    matrix = [[0] * cols for _ in range(rows)]
    
    for i in range(rows):
        for j in range(len(lst[i])):
            matrix[i][j] = lst[i][j]
    
    return matrix

# 示例列表
lst = [[1, 2, 3], [4, 5], [6, 7, 8, 9]]

# 创建矩阵
matrix = create_matrix_from_list(lst)

# 打印矩阵
for row in matrix:
    print(row)

[1, 2, 3, 0]
[4, 5, 0, 0]
[6, 7, 8, 9]