我正在构建一个讨论板风格的服务器/客户机应用程序，如果客户机连接到服务器，能够发布消息、阅读消息和退出。在
参见下面的客户代码：import socket
target_host = "0.0.0.0"
target_port = 9996
#create socket object
client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
#connect the client
client.connect((target_host,target_port))
#receiving user name prompt
print client.recv(1024)
usrname = str(raw_input())
#send username
client.send(usrname)
#check if username was unique
while client.recv(1024) == "NU": #should exit once "ACK" received
print client.recv(1024) #print username promt again
usrname = str(raw_input()) #client enters in another username
client.send(usrname)
#receive user joined message/welcome message/help menu
response = client.recv(1024)
print response
print client.recv(1024)
#loops until client disconnects
while True:
request = str(raw_input("\n\nWhat would you like to do? "))
client.send(request)
if request == "-h":
help_menu = client.recv(1024)
print help_menu
elif request == "-p":
#get subject
subject_request = client.recv(1024)
print subject_request
subject = str(raw_input())
client.send(subject)
#get contents of post
contents_request = client.recv(1024)
print contents_request
contents = str(raw_input())
client.send(contents)
#get post notification
message_post = client.recv(1024)
print message_post
elif request == "-r":
#get id value of post
id_request = client.recv(1024)
print id_request
message_id = str(raw_input())
client.send(message_id)
#get contents of post
message_contents = client.recv(2048)
print message_contents
elif request == "-q":
break
else:
print client.recv(1024)
当一个客户机加入时，我希望通知所有其他连接的客户机有一个新的客户机加入，但是每个客户机在代码中可能处于不同的位置(有些客户机可能正处于post的中间，在“您想做什么？”声明等)。在
那么，如何设置我的客户机代码，使它能够在另一个客户机加入时接受来自服务器的消息呢？在