python做一个分层，分为一级部门二级部门三级部门

好的，以下是一个三级部门的示例代码：

class Department:
    
    def __init__(self, name):
        self.name = name
        self.sub_departments = []
        
    def add_sub_department(self, sub_department):
        self.sub_departments.append(sub_department)
        
    def print_structure(self, level=0):
        print("|   " * level + "|--", self.name)
        for sub_department in self.sub_departments:
            sub_department.print_structure(level+1)

这个示例中，我们定义了一个 `Department` 类，表示部门。每个部门有一个 `name` 属性，并且可以包含多个子部门，子部门通过 `add_sub_department` 方法添加到父部门中。最后，我们定义了一个 `print_structure` 方法，用于打印出整个部门的层级结构。

使用示例：

# 创建部门
head_department = Department("总公司")
sub_department1 = Department("一级部门1")
sub_department2 = Department("一级部门2")
sub_department3 = Department("一级部门3")
sub_sub_department1 = Department("二级部门1")
sub_sub_department2 = Department("二级部门2")
sub_sub_department3 = Department("二级部门3")
sub_sub_sub_department1 = Department("三级部门1")
sub_sub_sub_department2 = Department("三级部门2")

# 添加子部门
sub_department1.add_sub_department(sub_sub_department1)
sub_department1.add_sub_department(sub_sub_department2)
sub_department2.add_sub_department(sub_sub_department3)
sub_sub_department1.add_sub_department(sub_sub_sub_department1)
sub_sub_department2.add_sub_department(sub_sub_sub_department2)
head_department.add_sub_department(sub_department1)
head_department.add_sub_department(sub_department2)
head_department.add_sub_department(sub_department3)

# 打印层级结构
head_department.print_structure()

输出结果：

|-- 总公司
|   |-- 一级部门1
|   |   |-- 二级部门1
|   |   |   |-- 三级部门1
|   |   |-- 二级部门2
|   |   |   |-- 三级部门2
|   |-- 一级部门2
|   |   |-- 二级部门3
|   |-- 一级部门3

这样就可以方便地打印出整个部门的层级结构了。