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

posted @ 2019-06-15 09:34  指弹小能手  阅读(82)  评论(0)    收藏  举报

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