This use tcp Protocol transfer data （ That is, set word selection tcp The corresponding parameter ,SOCKET_STREAM）

One 、 precondition :

          Import socket package , Two computers under one LAN （ Or create one locally win virtual machine ）

Two 、 Create server

        1、 Create socket

        2、 Bind local information

        3、 Use listen Change the default socket from active to passive

        4、 Waiting for a link from the client （accept), And create a socket to serve the linked client

        5、 Receiving data from clients

        6、 Send data to client

        7、 Close socket

from socket import *
def main():
# Create socket , Listening socket Be responsible for waiting for the new client to link
tcp_server_socket = socket(AF_INET,SOCK_STREAM)
# Bind local information
tcp_server_socket.bind(('' ,7890))
# Change socket from active to passive
tcp_server_socket.listen(128)
print('-------------listen---------')
#accept Waiting for a link from the client accept The new socket generated is used to serve the client
client_scoket,client_addr = tcp_server_socket.accept()
print('-------------accept---------')
print(client_addr)
# Receive information from clients
recv_data=client_scoket.recv(1024)
print(recv_data.decode('utf-8'))
# Send messages to clients
client_scoket.send(' Ha ha ha ha '.encode('utf-8'))
# Close socket
client_scoket.close()
tcp_server_socket.close()
if __name__ == '__main__':
main()

3、 ... and 、 Create client

        1、 Create socket

        2、 Link server

        3、 send out / receive data

        4、 Close socket

from socket import *
def main():
# Create socket
tcp_clien_socket = socket(AF_INET, SOCK_STREAM)
# Link server
server_addr = ('192.168.25.234', 7890)
tcp_clien_socket.connect(server_addr)
# send out / receive data
send_data = input(' Please input the data to be sent ')
tcp_clien_socket.send(send_data.encode('utf-8'))
rs_data = tcp_clien_socket.recv(1024)
print(rs_data.decode('utf-8'))
# Close socket
tcp_clien_socket.close()
if __name__ == '__main__':
main()

Four 、 Be careful ！！：

        accept and recv When there is no link or data received, it will cause function congestion ！！ Be similar to input, It's just input Waiting for you to enter data on the command line , and accept and recv It is waiting for the link and data of the client or server .