Seperate client and server of FTP

file_transfer_protocol/client.py

@@ -1,13 +1,13 @@
 import socket                   # Import socket module
 
-s = socket.socket()             # Create a socket object
+sock = socket.socket()             # Create a socket object
 host = socket.gethostname()     # Get local machine name
 port = 12312
 
-s.connect((host, port))
-s.send(b'Hello server!')
+sock.connect((host, port))
+sock.send(b'Hello server!')
 
-with open('Received_file', 'wb') as f:
+with open('Received_file', 'wb') as file:
     print('File opened')
     print('Receiving data...')
     while True:
@@ -16,8 +16,8 @@
         if not data:
             break
         # write data to a file
-        f.write(data)
+        file.write(data)
 
 print('Successfully got the file')
-s.close()
+sock.close()
 print('Connection closed')

file_transfer_protocol/server.py

@@ -3,32 +3,32 @@
 ONE_CONNECTION_ONLY = True      # Set this to False if you wish to continuously accept connections
 
 port = 12312                    # Reserve a port for your service.
-s = socket.socket()             # Create a socket object
+sock = socket.socket()             # Create a socket object
 host = socket.gethostname()     # Get local machine name
-s.bind((host, port))            # Bind to the port
-s.listen(5)                     # Now wait for client connection.
+sock.bind((host, port))            # Bind to the port
+sock.listen(5)                     # Now wait for client connection.
 
 print('Server listening....')
 
 while True:
-    conn, addr = s.accept()     # Establish connection with client.
+    conn, addr = sock.accept()     # Establish connection with client.
     print('Got connection from', addr)
     data = conn.recv(1024)
     print('Server received', repr(data))
 
     filename='mytext.txt'
-    f = open(filename,'rb')
-    l = f.read(1024)
-    while (l):
-       conn.send(l)
-       print('Sent ',repr(l))
-       l = f.read(1024)
-    f.close()
+    file = open(filename,'rb')
+    data = file.read(1024)
+    while (data):
+       conn.send(data)
+       print('Sent ',repr(data))
+       data = file.read(1024)
+    file.close()
 
     print('Done sending')
     conn.send(b'Thank you for connecting')
     conn.close()
     if ONE_CONNECTION_ONLY:  # This is to make sure that the program doesn't hang while testing
         break
-s.shutdown(1)
-s.close()
+sock.shutdown(1)
+sock.close()