python Iterable Iterator

##迭代器：是访问集合内元素的一种方式，用来for遍历数据，与下标方式的访问数据不一样，不能往回访问数据 ，提供了一种惰性方式数据的访问
#Iterable可迭代 __iter__   Iterator(Iterable) 迭代器 __iter__  __next__
from collections.abc import Iterable,Iterator
a=[]
print(isinstance(a,Iterable))##True
print(isinstance(a,Iterator))##False

def fib(index):
     a= 1 if index<2 else fib(index-1)+fib(index-2)
     return  a
print(fib(10))##89
def gen_fib(index):
    a,b,c=0,0,1
    while a<index:
        yield b+c
        b,c=c,c+b
        a+=1
for a in gen_fib(10):
    print(a)


def gen_fun():
    yield 1
    name="howhy"
    yield 2
    age=20
    return "end"
import dis
genfun=gen_fun()
print(dis.dis(genfun))
print(genfun.gi_frame.f_lasti)
print(genfun.gi_frame.f_locals)
next(genfun)
print(genfun.gi_frame.f_lasti)
print(genfun.gi_frame.f_locals)
next(genfun)
print(genfun.gi_frame.f_lasti)
print(genfun.gi_frame.f_locals)

 23           0 LOAD_CONST               1 (1)
              2 YIELD_VALUE
              4 POP_TOP

 24           6 LOAD_CONST               2 ('howhy')
              8 STORE_FAST               0 (name)

 25          10 LOAD_CONST               3 (2)
             12 YIELD_VALUE
             14 POP_TOP

 26          16 LOAD_CONST               4 (20)
             18 STORE_FAST               1 (age)

 27          20 LOAD_CONST               5 ('end')
             22 RETURN_VALUE
None
-1
{}
2
{}
12
{'name': 'howhy'}