协程相关

主要的思想:
如果一个变量自己有某种方法,而你想在不改变调用方式的前提下,希望可以点出它本身不存在的方法,就要想到用  类  封装的思想 , 将这个变量,改变为一个类的对象,在类中增加你需要的方法
例如:

# lst1= [1,2,3,4]#有append 的功能
# lst2= [1,2,3,4]#有append 的功能
# lst3= [1,2,3,4]#有append 的功能
# lst4= [1,2,3,4]#有append 的功能
# l = [lst1,lst2,lst3,lst4]
# for i in l:
#    i.append(6)#很明显都可以执行,
#    # i.eat()  明显直接飘红了,怎样在我不改变调用方式的前提下,可以将该功能实现:

import socket
import requests

# 方式一
ret = requests.get(‘https://www.baidu.com/s?wd=alex‘)


# 方式二
client = socket.socket()

# 百度创建连接: 阻塞
client.connect((‘www.baidu.com‘,80))

# 问百度我要什么？
client.sendall(b‘GET /s?wd=alex HTTP/1.0\r\nhost:www.baidu.com\r\n\r\n‘)

# 我等着接收百度给我的回复
chunk_list = []
while True:
    chunk = client.recv(8096)
    if not chunk:
        break
    chunk_list.append(chunk)

body = b‘‘.join(chunk_list)
print(body.decode(‘utf-8‘))

for item in key_list:
    ret = requests.get(‘https://www.baidu.com/s?wd=%s‘ %item)

# 方式二
def get_data(key):
    # 方式二
    client = socket.socket()

    # 百度创建连接: 阻塞
    client.connect((‘www.baidu.com‘,80))

    # 问百度我要什么？
    client.sendall(b‘GET /s?wd=alex HTTP/1.0\r\nhost:www.baidu.com\r\n\r\n‘)

    # 我等着接收百度给我的回复
    chunk_list = []
    while True:
        chunk = client.recv(8096)
        if not chunk:
            break
        chunk_list.append(chunk)

    body = b‘‘.join(chunk_list)
    print(body.decode(‘utf-8‘))

key_list = [‘alex‘,‘db‘,‘sb‘]
for item in key_list:
    get_data(item)

import threading

key_list = [‘alex‘,‘db‘,‘sb‘]
for item in key_list:
    t = threading.Thread(target=get_data,args=(item,))
    t.start()

import socket

client = socket.socket()
client.setblocking(True) # 将原来阻塞的位置变成非阻塞（报错）,改成 false即变成阻塞的了
# 百度创建连接: 阻塞

try:
    client.connect((‘www.baidu.com‘,80)) # 执行了但报错了
except BlockingIOError as e:
    pass

# 检测到已经连接成功

# 问百度我要什么？
client.sendall(b‘GET /s?wd=alex HTTP/1.0\r\nhost:www.baidu.com\r\n\r\n‘)

# 我等着接收百度给我的回复
chunk_list = []
while True:
    chunk = client.recv(8096) # 将原来阻塞的位置变成非阻塞（报错）
    if not chunk:
        break
    chunk_list.append(chunk)

body = b‘‘.join(chunk_list)
print(body.decode(‘utf-8‘))

import socket
import select



client1 = socket.socket()
client1.setblocking(False) # 百度创建连接: 非阻塞

try:
    client1.connect((‘www.baidu.com‘,80))
except BlockingIOError as e:
    pass


client2 = socket.socket()
client2.setblocking(False) # 百度创建连接: 非阻塞
try:
    client2.connect((‘www.sogou.com‘,80))
except BlockingIOError as e:
    pass


client3 = socket.socket()
client3.setblocking(False) # 百度创建连接: 非阻塞
try:
    client3.connect((‘www.oldboyedu.com‘,80))
except BlockingIOError as e:
    pass

socket_list = [client1,client2,client3]
conn_list = [client1,client2,client3]

while True:
    rlist,wlist,elist = select.select(socket_list,conn_list,[],0.005)
    # wlist中表示已经连接成功的socket对象
    for sk in wlist:
        if sk == client1:
            sk.sendall(b‘GET /s?wd=alex HTTP/1.0\r\nhost:www.baidu.com\r\n\r\n‘)
        elif sk==client2:
            sk.sendall(b‘GET /web?query=fdf HTTP/1.0\r\nhost:www.sogou.com\r\n\r\n‘)
        else:
            sk.sendall(b‘GET /s?wd=alex HTTP/1.0\r\nhost:www.oldboyedu.com\r\n\r\n‘)
        conn_list.remove(sk)
    for sk in rlist:
        chunk_list = []
        while True:
            try:
                chunk = sk.recv(8096)
                if not chunk:
                    break
                chunk_list.append(chunk)
            except BlockingIOError as e:
                break
        body = b‘‘.join(chunk_list)
        # print(body.decode(‘utf-8‘))
        print(‘------------>‘,body)
        sk.close()
        socket_list.remove(sk)
    if not socket_list:
        break

import socket
import select

class Req(object):
    def __init__(self,sk,func):
        self.sock = sk
        self.func = func

    def fileno(self):
        return self.sock.fileno()


class Nb(object):

    def __init__(self):
        self.conn_list = []
        self.socket_list = []

    def add(self,url,func):
        client = socket.socket()
        client.setblocking(False)  # 非阻塞
        try:
            client.connect((url, 80))
        except BlockingIOError as e:
            pass
        obj = Req(client,func)
        self.conn_list.append(obj)
        self.socket_list.append(obj)

    def run(self):

        while True:
            rlist,wlist,elist = select.select(self.socket_list,self.conn_list,[],0.005)
            # wlist中表示已经连接成功的req对象
            for sk in wlist:
                # 发生变换的req对象
                sk.sock.sendall(b‘GET /s?wd=alex HTTP/1.0\r\nhost:www.baidu.com\r\n\r\n‘)
                self.conn_list.remove(sk)
            for sk in rlist:
                chunk_list = []
                while True:
                    try:
                        chunk = sk.sock.recv(8096)
                        if not chunk:
                            break
                        chunk_list.append(chunk)
                    except BlockingIOError as e:
                        break
                body = b‘‘.join(chunk_list)
                # print(body.decode(‘utf-8‘))
                sk.func(body)
                sk.sock.close()
                self.socket_list.remove(sk)
            if not self.socket_list:
                break


def baidu_repsonse(body):
    print(‘百度下载结果：‘,body)

def sogou_repsonse(body):
    print(‘搜狗下载结果：‘, body)

def oldboyedu_repsonse(body):
    print(‘老男孩下载结果：‘, body)


t1 = Nb()
t1.add(‘www.baidu.com‘,baidu_repsonse)
t1.add(‘www.sogou.com‘,sogou_repsonse)
t1.add(‘www.oldboyedu.com‘,oldboyedu_repsonse)
t1.run()