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内置特殊方法及装饰器完结
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‎python_pro/oop面向对象/内置特殊方法.py‎

Lines changed: 201 additions & 48 deletions
Original file line numberDiff line numberDiff line change
@@ -314,60 +314,213 @@
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# ----------------遍历操作,恢复迭代器初始值-------------------------
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class Person:
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def __init__(self):
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self.res = 1
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# 方式一
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# def __getitem__(self, item):
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# self.res += 1
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# if self.res >= 6:
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# raise StopIteration("停止遍历")
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# return self.res
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# 方式二
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def __iter__(self):
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# 每次迭代重新赋值，使得迭代器重用
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self.res = 1
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return self
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# def __next__(self):
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# self.res += 1
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# if self.res >= 6:
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# raise StopIteration("停止遍历")
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# return self.res
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# class Person:
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# def __init__(self):
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# self.res = 1
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#
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# # 方式一
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# # def __getitem__(self, item):
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# # self.res += 1
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# # if self.res >= 6:
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# # raise StopIteration("停止遍历")
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# # return self.res
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#
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# # 方式二
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# def __iter__(self):
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# # 每次迭代重新赋值，使得迭代器重用
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# self.res = 1
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# return self
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#
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# # def __next__(self):
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# # self.res += 1
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# # if self.res >= 6:
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# # raise StopIteration("停止遍历")
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# # return self.res
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#
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# def __call__(self, *args, **kwargs):
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# self.res += 1
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# if self.res >= 6:
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# raise StopIteration("停止遍历")
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# return self.res
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#
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#
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# p = Person()
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# # 前提是实现了__getitem__方法，才可以使用iter()
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# # pt = iter(p.__next__, 4)
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# # 实例可以被调用，实现call方法
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# pt = iter(p, 4)
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# print(pt)
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# print(p is pt)
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# for i in pt:
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# print(i)
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#
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# # for i in p:
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# # print(i)
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#
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# # 可迭代对象或迭代器肯定可以for in，但是可以for in 不一定是可迭代对象或迭代器
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# from collections.abc import *
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#
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# # 实例成为迭代器条件：写__iter__方法与__next__方法
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# # 判断是不是迭代器对象
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# print(isinstance(p, Iterator))
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# # 判断是不是可迭代对象
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# print(isinstance(p, Iterable))
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# print(isinstance(pt, Iterator))
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# print(isinstance(pt, Iterable))
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# ----------------描述器定义方式一-------------------------
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# class Person:
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# def __init__(self):
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# self.__age = 18
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#
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# @property
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# def age(self):
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# return self.__age
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#
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# @age.setter
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# def age(self, value):
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# if value < 0:
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# value = 0
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# self.__age = value
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#
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# @age.deleter
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# def age(self):
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# del self.__age
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#
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# num = "jj"
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#
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#
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# person = Person()
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# person.age = 10
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# print(person.age)
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# del person.age
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# # print(person.age)
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# help(person)
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# ----------------描述器定义方式二-------------------------
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# class Age(object):
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# def __get__(self, instance, owner):
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# print("get")
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#
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# def __set__(self, instance, value):
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# print("set")
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#
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# def __delete__(self, instance):
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# print("delete")
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#
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#
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# class Person(object):
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# age = Age()
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# # def __getattribute__(self, item):
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# # print("kkkk")
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#
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# # 只要新式类才会转换操作描述器
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# person = Person()
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# person.age = 10
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# print(person.age)
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# del person.age
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# print(person.age)
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# help(person)
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# 只打印get。不会转换set和delete。所以一般通过实例操作描述器
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# print(Person.age)
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# Person.age = 20
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# del Person.age
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# 如果实现了__get__, 判定为"非资料描述器"
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# 如果实现了__get__、 __set__，判定为"资料描述器"
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# 资料描述器 > 实例字典 > 非资料描述器
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# ----------------描述器优先级-------------------------
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# class Age(object):
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# def __get__(self, instance, owner):
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# print("get")
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#
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# # def __set__(self, instance, value):
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# # print("set")
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# #
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# # def __delete__(self, instance):
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# # print("delete")
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#
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#
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# class Person(object):
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# age = Age()
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#
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# def __init__(self):
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# self.age = 100
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#
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#
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# # 只要新式类才会转换操作描述器
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# person = Person()
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# person.age = 10
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# print(person.age)
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# # del person.age
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# print(person.__dict__)
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# ----------------描述器值存在问题-------------------------
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# class Age(object):
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# def __get__(self, instance, owner):
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# print("get")
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# return instance.v
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#
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# def __set__(self, instance, value):
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# print("set", self, instance, value)
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# instance.v = value
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#
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# def __delete__(self, instance):
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# print("delete")
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# del instance.v
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#
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#
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# class Person(object):
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# age = Age()
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#
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#
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# # 多个实例的age对象相同，通过instance来修改值
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# person = Person()
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# person.age = 10
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# print(person.age)
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# # del person.age
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# person2 = Person()
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# person2.age = 100
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# print(person2.age)
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# print(person.age)
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# ----------------使用类实现装饰器-------------------------
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# def check(func):
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# def inner():
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# print("登录验证")
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# func()
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#
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# return inner
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class Check:
504+
def __init__(self, func):
505+
self.func = func
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340507
def __call__(self, *args, **kwargs):
341-
self.res += 1
342-
if self.res >= 6:
343-
raise StopIteration("停止遍历")
344-
return self.res
345-
346-
347-
p = Person()
348-
# 前提是实现了__getitem__方法，才可以使用iter()
349-
# pt = iter(p.__next__, 4)
350-
# 实例可以被调用，实现call方法
351-
pt = iter(p, 4)
352-
print(pt)
353-
print(p is pt)
354-
for i in pt:
355-
print(i)
508+
print("登录验证")
509+
self.func()
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357-
# for i in p:
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# print(i)
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360-
# 可迭代对象或迭代器肯定可以for in，但是可以for in 不一定是可迭代对象或迭代器
361-
from collections.abc import *
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# 语法糖装饰器 函数装饰器：@check 类装饰器：@Check
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# @check
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# @Check
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def publish_novels():
516+
print("发说说")
362517

363-
# 实例成为迭代器条件：写__iter__方法与__next__方法
364-
# 判断是不是迭代器对象
365-
print(isinstance(p, Iterator))
366-
# 判断是不是可迭代对象
367-
print(isinstance(p, Iterable))
368-
print(isinstance(pt, Iterator))
369-
print(isinstance(pt, Iterable))
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519+
# 函数装饰器
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# publish_novels = check(publish_novels)
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# 类装饰器
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publish_novels = Check(publish_novels)
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publish_novels()
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'''
372525
内置特殊方法
373526
1.生命周期方法[链接过去]

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