Question

Use Python TCP socket to implement an application with client-server architecture. In this application, client must read a line of characters from its input and send it to the server. The server must remove all non-alphanumeric characters from the input and send the modified data to the client. The client must receive the modified data and displays it on its screen.

Answer 1

Plese find below the code,

# save the below code as server.py

import socket

def remove_non_alphanumeric_characters(msg):
    """
    function to remove the nin alphanumeric chars from cleient message
    """
    return "".join([x for x in msg if x.isalnum()])
s = socket.socket()
port = 30013 #port number for connecting to server
host = socket.gethostname() # default localhost
s.bind((host, port)) # binding host with port
s.listen(5) # listening the client to connect
print("server listening.........\n")
while True:
   client, address = s.accept()
   client_msg = str(client.recv(1024).decode())
   print("Message received from client : ", client_msg)
   # removing the special character and sending to client
   client.send(remove_non_alphanumeric_characters(client_msg).encode())
   client.close()

# save the below code as client.py

import socket
# """ socket object """
s = socket.socket()
# port number for connection
port = 30013
host = socket.gethostname() # default hostname
s.connect((host, port)) # getting connection from host
msg = input("Enter the message  : ")
s.send(msg.encode()) # message sent to server
filtered_message  = s.recv(1024).decode()
print("Message after removing the non-alphanumeric charcaters : ",filtered_message)
s.close() # closing the connection

#first run the server.py and in another terminal/console run the client.py

#output

➜ python server.py
server listening.........

Message received from client : this_is_#message!
Message received from client : this_is@@@another.msg$#

➜ python client.py
Enter the message : this_is_#message!   
Message after removing the non-alphanumeric charcaters : thisismessage

➜ python client.py
Enter the message : this_is@@@another.msg$#
Message after removing the non-alphanumeric charcaters : thisisanothermsg