迭代器和生成器

ite=iter([1,2,3,4,5])#迭代器

print(ite.next())#1

print(ite.next())#2

print(ite.next())#3

print(ite.next())#4

def cash_money(money):#这个函数是生成器（yield)但返回的结果是一个迭代器

      money-=100

      yield 100

      print('again get money..')

atm=cash_money(500)

print(type(atm))#<type 'generator'>

print(atm.next())
print(atm.next())
print(atm.next())

print('i will go to play..')

print(atm.next())

#ret 正常的函数是需将函数执行完时才做做其它操作，但yield却实现了异步的效果

100

again get money...

100

again get money...

100

i will go to play..

again get money...

100

import time

def consumer(name):

    print("%s 准备吃包子啦!" %name)

    while True:

       baozi = yield

 

       print("包子[%s]来了,被[%s]吃了!" %(baozi,name))

 

def producer(name):

    c = consumer('A')

    c2 = consumer('B')

    c.__next__()

    c2.__next__()

    print("老子开始准备做包子啦!")

    for i in range(10):

        time.sleep(1)

        print("做了2个包子!")

        c.send(i)

        c2.send(i)

 

producer("alex")