# class Student(object):

# """docstring for Student"""

# def __init__(self, name):

# self.name = name

# def __str__(self):

# return'just a test %s'% self.name

# obj=Student('sweke')

# print(str(obj))

# print(Student('stefen'))

class fib(object):

"""docstring for fib"""

# def __init__(self, arg):

# super(fib, self).__init__()

# self.arg = arg

# def __getitem__(self,n):

# pass

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

return self.a

def __getitem__(self,n):

if isinstance(n,int):

if n>10000:

raise ValueError('range of fib must be less than 10000')

a,b=1,1

while n:

a,b=b,a+b

n-=1

return a

if isinstance(n,slice):

start=n.start

stop=n.stop

step=n.step

if step==None:

step=1

if stop>10000:

raise ValueError('the range of slice must be less than 10000')

if start==None:

start=0

if stop==None:

stop=10000

if step>(stop-start):

raise ValueError('step must be less than range of slice')

List=[]

a,b=1,1

for i in range(start,stop):

if step==1:

List.append(a)

elif(i-start)%step==0:

List.append(a)

a,b=b,a+b

return List

f=fib()

print(f[:15])

print(f[:15:2])