Python/simple_client/server.py

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# server.py
import socket
HOST, PORT = '127.0.0.1', 1400
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)#refer to client.py
s.bind((HOST, PORT))
s.listen(1)#listen for 1 connection
conn, addr = s.accept()#start the actual data flow
print('connected to:', addr)
while 1:
data = conn.recv(1024).decode('ascii')#receive 1024 bytes and decode using ascii
if not data:
break
conn.send((data + ' [ addition by server ]').encode('ascii'))
conn.close()