python 单线程实现并发

单线程下支持并发(服务端)：

from gevent import spawn,monkey;monkey.patch_all()  
from socket import *  
  
def server(ip,port):  
    server = socket(AF_INET, SOCK_STREAM)  
    server.bind((ip,port))  
    server.listen(5)  
  
    while True:  
        conn, addr = server.accept()  
        print(addr)  
        # ....  
        # t=Thread(target=talk,args=(conn,add))  
        # t.start()  
        spawn(talk,conn,addr)  
  
def talk(conn,addr):  
    while True:  
        try:  
            data=conn.recv(1024)  
            if not data:break  
            conn.send(data.upper())  
        except ConnectionResetError:  
            break  
    conn.close()  
  
if __name__ == '__main__':  
    server('127.0.0.1',8080) 

单线程下实现并发(客户端)：

from socket import *  
client = socket(AF_INET, SOCK_STREAM)  
client.connect(('127.0.0.1',8080))  
  
while True:  
    client.send('hello'.encode('utf-8'))  
    data=client.recv(1024)  
    print(data.decode('utf-8'))