class Fib(object):
def __init__(self):
self.a,self.b=0,1
def __iter__(self):
return self
def __next__(self):
self.a,self.b=self.b,self.a+self.b
if self.a>100:
raise StopIteration()
return self.a
def __getitem__(self,n):
if isinstance(n,int):
a,b=1,1
for x in range(n):
a,b=b,a+b
return a
if isinstance(n,slice):
start=n.start
stop=n.stop
step=1
step=n.step
a,b=1,1
R=[]
K=[]
for x in range(stop):
if x>=start:
R.append(a)
a,b=b,a+b
K=R[::step]
return K
print(Fib()[0:99:2])
class Mydict(object):
def __init__(self,key,value):
self.dict={}
self.dict[key]=value
def __getitem__(self,key):
return self.dict[key]
def __setitem__(self,key,value):
self.dict[key]=value
def __delitem__(self,key):
self.dict.pop(key)
a=Mydict(‘Eng‘,99)
a[‘Math‘]=90
print(a[‘Eng‘])
print(a[‘Math‘])
del a[‘Math‘]
print(a[‘Math‘])
原文：http://www.cnblogs.com/vonkimi/p/6942440.html