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super

内置方法：__len__(self), __getitem(self, key) ,  __setitem__(self, key,value), __delitem__(self, key)

property: 4个参数分别是fget, fset, fdel doc

class rect:    def __init__(self):        self.width = 0        self.height = 0    def setsize(self, size):        self.width, self.height = size    def getsize(self):        return self.width, self.height    size = property(getsize, setsize)

>>> r=rect()>>> r.width = 10>>> r.height = 5>>> r.size(10, 5)>>> r.size = 150, 100>>> r.width150

__getattr__(self.name)

__setattr__(self.name, value)

__delattr__(self,name)

使用self.__dict__[name]避免死循环。

迭代器：对象有__iter__可以迭代，next实现迭代： 放在for 循环使用，能返回所需的迭代器

class Fibs:    def __init__(self):        self.a = 0        self.b = 1    def __next__(self):        self.a, self.b = self.b, self.a + self.b        return self.a    def __iter__(self):        return self

>>> fibs =Fibs()>>> for f in fibs:	if f > 1000:		print(f)		break	1597

class Fibs:    def __init__(self):        self.a = 0        self.b = 1    def __next__(self):        #self.a, self.b = self.b, self.a + self.b        #return self.a        pass    def __iter__(self):        return self

>>> fibs =Fibs()>>> i =1>>> for f in fibs:	if i < 10:		print(f)		i+=1	else:		print('finish')		break	NoneNoneNoneNoneNoneNoneNoneNoneNonefinish

>>> it = iter([1,2,3])>>> it.__next__()1>>> it.__next__()2>>> it.__next__()3>>> it.__next__()Traceback (most recent call last):  File "
   
    ", line 1, in 
    
         it.__next__()StopIteration
    
   

class titer:    value = 0    def __next__(self):        self.value += 1        if self.value > 10: raise StopIteration        return self.value    def __iter__(self):        return self

>>> ti =titer()>>> list(ti)[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

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