python file upload with socket

Please, I have these codes in python 2.7 which great in downloading files from the server. How could extend them to add upload using a socket, threading with the ability to list files in server side and user should enter hardcoded username and password before it granted to enter and list files?

the requirements are simple but I'm still beginner ..

Server Code

 

  import socket
    import threading
    import os

    def RetrFile(name, sock):
    filename = sock.recv(1024)
    if os.path.isfile(filename):
        sock.send("EXISTS " + str(os.path.getsize(filename)))
        userResponse = sock.recv(1024)
        if userResponse[:2] == 'OK':
            with open(filename, 'rb') as f:
                bytesToSend = f.read(1024)
                sock.send(bytesToSend)
                while bytesToSend != "":
                    bytesToSend = f.read(1024)
                    sock.send(bytesToSend)
    else:
        sock.send("ERR ")

    sock.close()

def Main():
    host = '127.0.0.1'
    port = 5000


    s = socket.socket()
    s.bind((host,port))

    s.listen(5)

    print "Server Started."
    while True:
        c, addr = s.accept()
        print "client connedted ip:<" + str(addr) + ">"
        t = threading.Thread(target=RetrFile, args=("RetrThread", c))
        t.start()

    s.close()

if __name__ == '__main__':
    Main()

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Client code

import socket

def Main():
    host = '127.0.0.1'
    port = 5000

    s = socket.socket()
    s.connect((host, port))

    filename = raw_input("Filename? -> ")
    if filename != 'q':
        s.send(filename)
        data = s.recv(1024)
        if data[:6] == 'EXISTS':
            filesize = long(data[6:])
            message = raw_input("File exists, " + str(filesize) +"Bytes, download? (Y/N)? -> ")
            if message == 'Y':
                s.send("OK")
                f = open('new_'+filename, 'wb')
                data = s.recv(1024)
                totalRecv = len(data)
                f.write(data)
                while totalRecv < filesize:
                    data = s.recv(1024)
                    totalRecv += len(data)
                    f.write(data)
                    print "{0:.2f}".format((totalRecv/float(filesize))*100)+ "% Done"
                print "Download Complete!"
                f.close()
        else:
            print "File Does Not Exist!"

    s.close()

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