Flask之上下文管理

import functools
def index(a1,a2):
    return a1 + a2
# 原来的调用方式
# ret = index(1,23)
# print(ret)
# 偏函数，帮助开发者自动传递参数
new_func = functools.partial(index,666)
ret = new_func(1)
print(ret)

class Base(object):
    def func(self):
        print(‘Base.func‘)
class Foo(Base):
    def func(self):
        # 方式一：根据mro的顺序执行方法
        # super(Foo,self).func()
        # 方式二：主动执行Base类的方法
        # Base.func(self)

        print(‘Foo.func‘)
obj = Foo()
obj.func()

# print(Foo.__mro__)

一
class Foo(object):
    def __init__(self):
        self.storage = {}
        # object.__setattr__(self,‘storage‘,{})

    def __setattr__(self, key, value):
        print(key,value)

obj = Foo()
obj.xx = 123

结果
storage {}
xx 123

二
class Foo(object):
    def __init__(self):
        self.storage = {}
        # object.__setattr__(self,‘storage‘,{})

    def __setattr__(self, key, value):
        print(key,value,self.storage)  # 打印self.storage会报错，因为实例化对象先执行
        #init，init中self.storage会触发seattr方法，seattr中的self.storge没有定义

obj = Foo()
obj.xx = 123


三
class Foo(object):
    def __init__(self):
        # self.storage = {}
        object.__setattr__(self,‘storage‘,{})

    def __setattr__(self, key, value):
        print(key,value,self.storage)

obj = Foo()
obj.xx = 123