实现责任链模式示例，添加经理类及相关方法，增强代码可读性

python/chain_of_responsibility/main.py

@@ -0,0 +1,63 @@
+"""
+实例：
+汤宝宝申请报销款，需要走产品经理、部门经理和总经理的审核~
+"""
+
+class Manager:
+    def __init__(self, name):
+        self.name = name
+        self.successor = None
+        self.amount = 0
+
+    def set_successor(self, manager: 'Manager'):
+        self.successor = manager
+        print(f"{self.name}的下一级经理是{manager.name}")
+
+    def set_amount_right(self, amount: float):
+        self.amount = amount
+        print(f"{self.name}的报销权限是{amount:.2f}元")
+
+    def have_right(self, amount: float) -> bool:
+        right = amount <= self.amount
+        if right:
+            print(f"{self.name}有权限审批{amount:.2f}元的报销请求")
+        else:
+            print(f"{self.name}没有权限审批{amount:.2f}元的报销请求")
+        return right
+
+    def approve(self, name:str, amount: float):
+        print(f"{name}提交了一笔{amount:.2f}元的报销请求")
+        if self.have_right(amount):
+            print(f"{self.name}审批通过了{name}的报销请求，金额为{amount:.2f}元")
+        elif self.successor:
+            print(f"{self.name}将{name}的报销请求上报给{self.successor.name}审批")
+            self.successor.approve(name, amount)
+        else:
+            print(f"没有合适的经理审批{name}的报销请求，金额为{amount:.2f}元")
+
+if __name__ == "__main__":
+    print("========= 责任链模式 =========")
+
+    # 创建经理
+    pm = Manager("产品经理")
+    pm.set_amount_right(1000)
+    dm = Manager("部门经理")
+    dm.set_amount_right(5000)
+    gm = Manager("总经理")
+    gm.set_amount_right(20000)
+
+    # 设置责任链
+    pm.set_successor(dm)
+    dm.set_successor(gm)
+
+    # 提交报销请求
+    print("-----")
+    pm.approve("汤宝宝", 800)
+    print("-----")
+    pm.approve("汤宝宝", 3000)
+    print("-----")
+    pm.approve("汤宝宝", 15000)
+    print("-----")
+    pm.approve("汤宝宝", 25000)
+
+    print("\n======= 责任链模式结束 =======")