Python 小栈_09：Python 生成器

import time
def delivery():
    print("开始生孩子啦")
    yield "我"
    time.sleep(4)
    print("开始生儿子啊")
    yield "儿子"
    time.sleep(4)
    print("开始生孙子啦")
    yield "孙子"
li=delivery()
print(li.__next__())
print(li.__next__())
print(li.__next__())

def pro_li():
    for i in range(1,20):
        print("正在生产包子")
        print("正在卖包子")
        yield "一屉包子%s"%i

a=pro_li()
print(a.__next__())
print(a.__next__())

def jidan():
    for i in range(1,15):
        yield "鸡蛋%s"%i

a=jidan()
res=a.__next__()
print("happy取走了",res)
res=a.__next__()
print("happy取走了",res)

tell内容：
{"city":"beijing","population":1322432}
{"city":"shanxi","population":1320000}
{"city":"anhui","population":1536752}
{"city":"hunan","population":906836455}

人口普查取和

def popu():
    with open("tell","r",encoding="utf-8") as f:
        for i in f:
            yield i

popu_li=popu()

res=0
for i in popu_li:
    a=eval(i)   --->注意：文件所有的记录都是以字符串形式的，要使用eval()函数把字符串中的字典形式提取出来
    print(a["population"]) --->把字典中的population中的V值提取出来
    res+=a["population"] --->求人口总和
print(res)

生产者消费者模型

def consumer(name):
    print("我是[%s]，我准备开始吃包子了"%name)
    while True:
        baozi=yield  --->到这里终止
        print("%s 很开心地把[%s]吃掉了"%(name,baozi))

def prodecer():
    c1 = consumer("happy")  --->调用执行consumer()函数
    c2 = consumer("banana")
    c1.__next__()
    c2.__next__()

    for i in range(1,15):
        c1.send("包子%s"%i)
        c2.send("包子%s" % i)
prodecer()

#可使两个程序重复交替进行

def a():
    for i in range(1,10):
        yield "鸡蛋%s"%i

b=a()
print(b.__next__())
print(b.__next__())
print(b.__next__())
print(b.__next__())
print(b.send(None))
print(b.send(None))
print(b.send(None))
print(b.send(None))

>>>

鸡蛋1
鸡蛋2
鸡蛋3
鸡蛋4
鸡蛋5
鸡蛋6
鸡蛋7
鸡蛋8