In bidirectional communications channel, sockets are two end points. Sockets can communicate between process on the same machine or on different continents.
Sockets are implemented by the different types of channel-TCP, UDP.
For creating Socket, we need socket module and socket.socket () function.
Syntax
my_socket = socket.socket (socket_family, socket_type, protocol=0)
Different methods in Server Socket
my_socket.bind()
This method is used for binding address (hostname, port number pair) to socket.
my_socket.listen()
This method is used for set up and start TCP listener.
my_socket.accept()
This method is used for accepting TCP client connection, waiting until connection arrives (blocking).
Different methods in Client Socket
my_socket.connect()
This method actively initiates TCP server connection.
General Socket Methods
my_socket.recv()
This method receives TCP message
my_socket.send()
This method transmits TCP message
my_socket.recvfrom()
This method receives UDP message
my_socket.sendto()
This method transmits UDP message
my_socket.close()
This method closes socket
my_socket.gethostname()
This method returns the hostname.
Server socket
Example
import socket
my_socket = socket.socket() # Create a socket object
my_host = socket.gethostname()
my_port = 00000# Store a port for your service.
my_socket.bind((my_host, my_port))
my_socket.listen(5) # Now wait for client connection.
while True:
cl, myaddr = my_socket.accept() # Establish connection with client.
print ('Got connection from', myaddr)
cl.send('Thank you for connecting')
cl.close() # Close the connection
Client socket
Example
import socket # Import socket module my_socket = socket.socket() # Create a socket object my_host = socket.gethostname() # Get local machine name my_port = 00000# Store a port for your service. my_socket.connect((my_host, my_port)) print (my_socket.recv(1024)) my_socket.close