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* 内容：使多个对象都有机会处理请求，从而避免请求的发送者和接收者之间的耦合关系。将这些对象连成一条链，并沿着这条链传递该请求，直到有一个对象处理它为止。
* 角色：
* 抽象处理者（Handler）
* 具体处理者（ConcreteHandler）
* 客户端（Client）
* UML图
* 举个例子：
需求：在公司申请请假，请假天数的不同，审批权限也不同，根据天数来这个一个模式进行申请分发。 from abc import ABCMeta,
abstractmethodclass Handler(metaclass=ABCMeta): @abstractmethod def handle_leave
(self, day): pass class GeneralManager(Handler): def handle_leave(self, day): if
day<= 10: print("总经理准假%d天" % day) else: print("你还是辞职吧") class DepartmentManager
(Handler): def __init__(self): self.next=GeneralManager() def handle_leave(self,
day): if day<=5: print("部门经理准假%s天"%day) else: print("部门经理职权不足") self.next.
handle_leave(day) class ProjectDirector(Handler): def __init__(self): self.next=
DepartmentManager() def handle_leave(self, day): if day<=3: print("项目主管准假%d天"%
day) else: print("项目主管权限不足") self.next.handle_leave(day) # client day=15 h=
ProjectDirector() h.handle_leave(day)
输出结果：
项目主管权限不足
部门经理职权不足
你还是辞职吧
* 适用场景：
* 有多个对象处理一个请求，哪个对象处理由运行时决定
* 在不明确接收者的情况下，向多个对象中的一个提交一个请求
* 优点：
* 降低偶合度：一个对象无需知道是其他哪一个对象处理其请求
