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echo_server.py

+import socket
+import sys
+
+#using TCP socket
+serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+
+#accepting server port and only command-line argument
+port = int(sys.argv[1])
+serversocket.bind(('localhost', port))
+
+serversocket.listen(5)
+#infinite loop to wait for incoming connections from client
+while True:
+    #accept incoming connection
+    conn, client = serversocket.accept()
+    
+    #read in text from connection
+    text = conn.recv(100)
+    
+    #print text to STDOUT
+    print(text.decode())
+    
+    #send text back to client
+    conn.sendall(text)
+    
+    #close connection
+    conn.close()
+
+    
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