我有一个变量和一个矩阵，如何正确移动元素？

# 示例代码：将矩阵中的元素向右移动一列
def shift_matrix_right(matrix):
    rows = len(matrix)
    cols = len(matrix[0])
    new_matrix = [[0] * cols for _ in range(rows)]
    
    for i in range(rows):
        for j in range(cols - 1):
            new_matrix[i][j + 1] = matrix[i][j]
    
    return new_matrix

# 示例矩阵
matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

# 移动后的矩阵
new_matrix = shift_matrix_right(matrix)
print(new_matrix)

# 示例代码：将矩阵中的元素向左移动一列
def shift_matrix_left(matrix):
    rows = len(matrix)
    cols = len(matrix[0])
    new_matrix = [[0] * cols for _ in range(rows)]
    
    for i in range(rows):
        for j in range(cols):
            if j > 0:
                new_matrix[i][j - 1] = matrix[i][j]
            else:
                new_matrix[i][-1] = matrix[i][j]
    
    return new_matrix

# 示例矩阵
matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

# 移动后的矩阵
new_matrix = shift_matrix_left(matrix)
print(new_matrix)

# 示例代码：处理边界问题
def shift_matrix_right(matrix):
    rows = len(matrix)
    cols = len(matrix[0])
    new_matrix = [[0] * cols for _ in range(rows)]
    
    for i in range(rows):
        for j in range(cols - 1):
            new_matrix[i][j + 1] = matrix[i][j]
        new_matrix[i][0] = matrix[i][-1]  # 处理最后一列
    
    return new_matrix

# 示例代码：避免数据覆盖
def shift_matrix_right(matrix):
    rows = len(matrix)
    cols = len(matrix[0])
    new_matrix = [[0] * cols for _ in range(rows)]
    
    for i in range(rows):
        for j in range(cols - 1):
            new_matrix[i][j + 1] = matrix[i][j]
        new_matrix[i][0] = matrix[i][-1]  # 处理最后一列
    
    return new_matrix