组合补充,主动调用其他类的成员,特殊成员

一丶组合补充

1.类或对象是否能做字典的key

class Foo:
    pass

user_info = {
    Foo:1,
    Foo():5
}

print(user_info)

2.对象中到底有什么?

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.烧脑练习 top 1

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')

# 创建了一个列表,列表中有三个对象(实例)
# [ StarkConfig对象(num=1), StarkConfig对象(num=2), RoleConfig对象(num=3) ]
config_obj_list = [StarkConfig(1),StarkConfig(2),RoleConfig(3)]
for item in config_obj_list:
    print(item.num)

4.烧脑练习top2

class StarkConfig(object):

    def __init__(self,num):
        self.num = num

    def changelist(self,request):
        print(self.num,request)

class RoleConfig(StarkConfig):
    pass

# 创建了一个列表,列表中有三个对象(实例)
# [ StarkConfig对象(num=1), StarkConfig对象(num=2), RoleConfig对象(num=3) ]
config_obj_list = [StarkConfig(1),StarkConfig(2),RoleConfig(3)]
for item in config_obj_list:
    item.changelist(168)

5.烧脑练习top3

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)

# 创建了一个列表,列表中有三个对象(实例)
# [ StarkConfig对象(num=1), StarkConfig对象(num=2), RoleConfig对象(num=3) ]
config_obj_list = [StarkConfig(1),StarkConfig(2),RoleConfig(3)]
for item in config_obj_list:
    item.changelist(168)

6.烧脑练习top4

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() # 666 3

7.烧脑练习top5

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)) # 0
site.register('range',666)
site.register('shilei',438)
print(len(site._registry)) # 2

site.register('lyd',StarkConfig(19))
site.register('yjl',StarkConfig(20))
site.register('fgz',RoleConfig(33))

print(len(site._registry)) # 5

8.烧脑练习top6

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)

9.烧脑练习top7

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()

10.烧脑练习top8

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)) # 3
for k,row in site._registry.items():
    row.run()

二丶主动调用其他类的成员

　　方法一:

            class Base(object):

                def f1(self):
                    print('5个功能')

            class Foo(object):

                def f1(self):
                    print('3个功能')
                    Base.f1(self)

            obj = Foo()
            obj.f1(

　总结:Base.实例方法(自己上传self)

　　　与继承能力无关

　　　　方法二:

            class Foo(object):
                def f1(self):
                    super().f1()
                    print('3个功能')

            class Bar(object):
                def f1(self):
                    print('6个功能')

            class Info(Foo,Bar):
                pass

            # obj = Foo()
            # obj.f1()

            obj = Info()
            obj.f1()

　　

三丶特殊成员

1.类名() 自动执行__init__

class Foo(object):

    def __init__(self,a1,a2):
        self.a1 = a1
        self.a2 = a2
obj = Foo(1,2)

2.对象() 自动执行__call__

def __call__(self, *args, **kwargs):
        print(11111,args,kwargs)
        return 123
ret = obj(6,4,2,k1 = 456)

3.对象['xx'] 自动执行__getitem__

def __setitem__(self, key, value):
        print(key,value,111111111)
ret = obj['yu']
print(ret)

4.对象['xx'] = 11 自动执行__setitem__

def __setitem__(self, key, value):
        print(key,value,111111111)
obj['k1'] = 123

5.del 对象[xx]   自动执行__delitem__

 def __delitem__(self, key):
        print(key)
del obj['uuu']

6.对象+对象  自动执行__add__

def __add__(self, other):
      return self.a1 + other.a2
obj1 = Foo(1,2)
obj2 = Foo(88,99)
ret = obj2 + obj1
print(ret)

7.with 对象 　　自动执行 __enter/__exit__

def __enter__(self):
        print('1111')
        return 999

def __exit__(self, exc_type, exc_val, exc_tb):
        print('22222')

obj = Foo(1,2)
with obj as f:
    print(f)
    print('内部代码')

8.__str__如果类中定义了__str__方法,那么打印对象时,默认该输出方法的返回值

class Foo:

    def __str__(self):
        return 1


obj = Foo()
print obj
# 输出：1

9.__doc__  表示类的描述信息

class Foo:
    """ 描述类信息 """

    def func(self):
        pass

print Foo.__doc__
#输出：类的描述信息

10.__dict__  类或者对象的所有成员

class Foo(object):
    def __init__(self,name,age):
        self.name = name
        self.age = age

    def func(self):
        pass

obj1 = Foo('刘博文',99)
obj2 = Foo('史雷',89)

print(obj1.__dict__) # {'name': '刘博文', 'age': 99}
print(obj2.__dict__) # {'name': '史雷', 'age': 89}

11.__iter__用于迭代器，之所以列表、字典、元组可以进行for循环，是因为类型内部定义了 __iter__ 

    # l1是list类的一个对象，可迭代对象
            l1 = [11,22,33,44]

            # l2是list类的一个对象，可迭代对象
            l2 = [1,22,3,44]


            class Foo(object):
                def __init__(self,name,age):
                    self.name = name
                    self.age = age

                def func(self):
                    pass

                def __iter__(self):
                    # return iter([11,22,33,44,55,66])

                    yield 11
                    yield 22
                    yield 33

            # obj1是Foo类的一个对象，可迭代对象
            """
            如果想要把不可迭代对象 -> 可迭代对象
            1. 在类中定义__iter__方法
            2. iter内部返回一个迭代器(生成器也是一种特殊迭代器)
            """
            obj1 = Foo('刘博文',99)

            for item in obj1:
                print(item)

12.真正的构造方法

class Foo(object):
    def __init__(self, a1, a2):     # 初始化方法
        """
        为空对象进行数据初始化
        :param a1:
        :param a2:
        """
        self.a1 = a1
        self.a2 = a2

    def __new__(cls, *args, **kwargs): # 构造方法
        """
        创建一个空对象
        :param args:
        :param kwargs:
        :return:
        """
        return object.__new__(cls) # Python内部创建一个当前类的对象(初创时内部是空的.).

obj1 = Foo(1,2)
print(obj1)

obj2 = Foo(11,12)
print(obj2)