21-作业-面向对象特殊成员和异常处理

  1. 列举你了解的面向对象中的特殊成员，并为每个写代码示例。

  2. 看代码写结果

    		class Foo(object):
    		 
    		    def __init__(self, age):
    		        self.age = age
    		 
    		    def display(self):
    		        print(self.age)
    		 
    		 
    		data_list = [Foo(8), Foo(9)]
    		for item in data_list:
    		    print(item.age, item.display())

  3. 看代码写结果

    		class Base(object):
    		    def __init__(self,a1):
    		        self.a1 = a1
    		        
    		    def f2(self,arg):
    		        print(self.a1,arg)
    		        
    		class Foo(Base):
    		    def f2(self,arg):
    		        print('666')
    		        
    		obj_list = [Base(1),Foo(2),Foo(3)]
    		for obj in obj_list:
    			item.f2()

  4. 看代码写结果

    		class StarkConfig(object):
    		 
    		    def __init__(self,num):
    		        self.num = num
    		 
    		    def changelist(self,request):
    		        print(self.num,request)
    		 
    		class RoleConfig(StarkConfig):
    		 
    		    def changelist(self,request):
    		        print('666')
    		 
    		config_obj_list = [StarkConfig(1),StarkConfig(2),RoleConfig(3)]
    		for item in config_obj_list:
    		    print(item.num)

  5. 看代码写结果

    		class StarkConfig(object):
    		 
    		    def __init__(self,num):
    		        self.num = num
    		 
    		    def changelist(self,request):
    		        print(self.num,request)
    		 
    		class RoleConfig(StarkConfig):
    		    pass
    		 
    		config_obj_list = [StarkConfig(1),StarkConfig(2),RoleConfig(3)]
    		for item in config_obj_list:
    		    item.changelist(168)

  6. 看代码写结果

    		class StarkConfig(object):
    		 
    		    def __init__(self,num):
    		        self.num = num
    		 
    		    def changelist(self,request):
    		        print(self.num,request)
    		 
    		class RoleConfig(StarkConfig):
    		 
    		    def changelist(self,request):
    		        print(666,self.num)
    		 
    		config_obj_list = [StarkConfig(1),StarkConfig(2),RoleConfig(3)]
    		for item in config_obj_list:
    		    item.changelist(168)

  7. 看代码写结果

    		class StarkConfig(object):
    		 
    		    def __init__(self,num):
    		        self.num = num
    		 
    		    def changelist(self,request):
    		        print(self.num,request)
    		 
    		    def run(self):
    		        self.changelist(999)
    		 
    		class RoleConfig(StarkConfig):
    		 
    		    def changelist(self,request):
    		        print(666,self.num)
    		 
    		config_obj_list = [StarkConfig(1),StarkConfig(2),RoleConfig(3)]
    		config_obj_list[1].run()
    		config_obj_list[2].run()

  8. 看代码写结果

    		class StarkConfig(object):
    		 
    		    def __init__(self,num):
    		        self.num = num
    		 
    		    def changelist(self,request):
    		        print(self.num,request)
    		 
    		    def run(self):
    		        self.changelist(999)
    		 
    		class RoleConfig(StarkConfig):
    		 
    		    def changelist(self,request):
    		        print(666,self.num)
    		 
    		 
    		class AdminSite(object):
    		    def __init__(self):
    		        self._registry = {}
    		 
    		    def register(self,k,v):
    		        self._registry[k] = v
    		 
    		site = AdminSite()
    		print(len(site._registry)) 
    		site.register('range',666)
    		site.register('shilei',438)
    		print(len(site._registry))
    		 
    		site.register('lyd',StarkConfig(19))
    		site.register('yjl',StarkConfig(20))
    		site.register('fgz',RoleConfig(33))
    		 
    		print(len(site._registry))
    		print(site._registry)

  9. 看代码写结果

    		class StarkConfig(object):
    		 
    		    def __init__(self,num):
    		        self.num = num
    		 
    		    def changelist(self,request):
    		        print(self.num,request)
    		 
    		    def run(self):
    		        self.changelist(999)
    		 
    		class RoleConfig(StarkConfig):
    		 
    		    def changelist(self,request):
    		        print(666,self.num)
    		 
    		class AdminSite(object):
    		    def __init__(self):
    		        self._registry = {}
    		 
    		    def register(self,k,v):
    		        self._registry[k] = v
    		 
    		site = AdminSite()
    		site.register('lyd',StarkConfig(19))
    		site.register('yjl',StarkConfig(20))
    		site.register('fgz',RoleConfig(33))
    		print(len(site._registry)) # 3
    		 
    		for k,row in site._registry.items():
    		    row.changelist(5)

  10. 看代码写结果

    		class StarkConfig(object):
    		 
    		    def __init__(self,num):
    		        self.num = num
    		 
    		    def changelist(self,request):
    		        print(self.num,request)
    		 
    		    def run(self):
    		        self.changelist(999)
    		 
    		class RoleConfig(StarkConfig):
    		 
    		    def changelist(self,request):
    		        print(666,self.num)
    		 
    		class AdminSite(object):
    		    def __init__(self):
    		        self._registry = {}
    		 
    		    def register(self,k,v):
    		        self._registry[k] = v
    		 
    		site = AdminSite()
    		site.register('lyd',StarkConfig(19))
    		site.register('yjl',StarkConfig(20))
    		site.register('fgz',RoleConfig(33))
    		print(len(site._registry)) # 3
    		 
    		for k,row in site._registry.items():
    		    row.run()

  11. 看代码写结果

    		class UserInfo(object):
    		    pass
    		 
    		class Department(object):
    		    pass
    		 
    		class StarkConfig(object):
    		 
    		    def __init__(self,num):
    		        self.num = num
    		 
    		    def changelist(self,request):
    		        print(self.num,request)
    		 
    		    def run(self):
    		        self.changelist(999)
    		 
    		class RoleConfig(StarkConfig):
    		 
    		    def changelist(self,request):
    		        print(666,self.num)
    		 
    		class AdminSite(object):
    		    def __init__(self):
    		        self._registry = {}
    		 
    		    def register(self,k,v):
    		        self._registry[k] = v(k)
    		 
    		site = AdminSite()
    		site.register(UserInfo,StarkConfig)
    		site.register(Department,StarkConfig)
    		print(len(site._registry))
    		for k,row in site._registry.items():
    		    row.run()

  12. 看代码写结果

    		class F3(object):
    		    def f1(self):
    		        ret = super().f1()
    		        print(ret)
    		        return 123
    		    
    		class F2(object):
    		    def f1(self):
    		        print('123')
    		        
    		class F1(F3, F2):
    			pass
    		 
    		obj = F1()
    		obj.f1()

  13. 看代码写结果

    		class Base(object):
    		    def __init__(self,name):
    		        self.name = name
    		        
    		class Foo(Base):
    		    def __init__(self,name):
    		        super().__init__(name)
    		        self.name = "于大爷"
    		        
    		obj1 = Foo('alex')
    		print(obj1.name)
    		 
    		obj2 = Base('alex')
    		print(obj2.name)

  14. 看代码写结果

    		class Base(object):
    		    pass
    		 
    		class Foo(Base):
    		    pass
    		 
    		 
    		obj = Foo()
    		 
    		print(type(obj) == Foo)
    		print(type(obj) == Base)
    		print(isinstance(obj,Foo))
    		print(isinstance(obj,Base))

  15. 看代码写结果

    		class StarkConfig(object):
    		    def __init__(self, num):
    		        self.num = num
    		    def __call__(self, *args, **kwargs):
    		        print(self.num)
    		class RoleConfig(StarkConfig):
    		    def __call__(self, *args, **kwargs):
    		        print(self.num)
    		 
    		v1 = StarkConfig(1)
    		v2 = RoleConfig(11)
    		 
    		v1() 
    		v2()

  16. 看代码写结果

    		class StarkConfig(object):
    		    def __init__(self, num):
    		        self.num = num
    		    def run(self):
    		        self()
    		    def __call__(self, *args, **kwargs):
    		        print(self.num)
    		        
    		class RoleConfig(StarkConfig):
    		    def __call__(self, *args, **kwargs):
    		        print(345)
    		    def __getitem__(self, item):
    		        return self.num[item]
    		    
    		v1 = RoleConfig('alex')
    		v2 = StarkConfig("wupeiqi")
    		 
    		print(v1[1])
    		print(v2[2])

  17. 补全代码

    		class Context:
    			pass
    		 
    		with Context() as ctx:
    		    ctx.do_something()

  18. 补全代码

    		class Stack(object):
    		    def __init__(self):
    		        self.data_list = []
    		        
    		    def push(self,val):
    		        pass
    		    
    		    def pop(self):
    		        pass
    		    
    		    
    		obj = Stack()
    		# 调用push方法，将数据加入到data_list中。
    		obj.push('alex')
    		obj.push('武沛齐')
    		obj.push('金老板')
    		 
    		# 调用pop讲数据从data_list获取并删掉，注意顺序(按照后进先出的格式)
    		v1 = obj.pop() # 金老板
    		v2 = obj.pop() # 武沛齐
    		v3 = obj.pop() # alex
    		 
    		# 请补全Stack类中的push和pop方法，将obj的对象维护成 后进先出 的结构。

  19. 如何主动触发一个异常？

  20. 看代码写结果

    		def func(arg):
    		    try:
    		        int(arg)
    			except Exception as e:
    		        print('异常')
    			finally:
    		        print('哦')
    		        
    		func('123')
    		func('二货')

预习

  • 面向对象约束

    		class BaseAuthentication(object):
    		    """
    		    All authentication classes should extend BaseAuthentication.
    		    """
    		 
    		    def authenticate(self, request):
    		        """
    		        Authenticate the request and return a two-tuple of (user, token).
    		        """
    		        raise NotImplementedError(".authenticate() must be overridden.")
    		 
    		 
    		class Foo(BaseAuthentication):
    		    def authenticate(self,request):
    		        pass
    		 
    		obj = Foo()
    		obj.authenticate()

  • 可迭代对象

  • 反射

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