学步园

import itertools
def fib():
    first = 0
    second = 1
    while 1:
        n=first+second
        yield n
        first=second
        second=n

print list(itertools.islice(fib(),10))

import itertools
def fib():
    first, second=0, 1
    while 1:
        yield second
        first, second= second, first+second

print list(itertools.islice(fib(),10))

def get(n):
    a=0
    b=1
    for k in range(n):
        a,b=b,a+b
        if b>n:
            yield b
            break

for i in get(100):#此处的100也是循环的次数
    print i

def get(n):
    a=0
    b=1
    l.extend((a,b)) #将a、b追加至l
    for k in range(n):
        a,b=b,a+b
        l.append(b)
        
        if len(l)==10:
            yield l
            break
l=[]
for i in get(10):
    print i  # 结果[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]