How to initiate bidirectional file transfer between server and client using Python socket to measure upload and download speed?

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Python

sockets

I am writing a python code to find throughput between server and client. It is based on speedtest.net functionality where I am sending a dummy file to calculate the speed. The problem I am facing is unidirectional throughput. How to work on transferring files from client to server and measure the upload speed as well as the same time? I will appreciate your suggestions on the same. Here is the code.

Server.py

import socket

import os

port = 60000
s = socket.socket()
host = socket.gethostname()
print host
s.bind((host, port))
s.listen(5)

print 'Server listening....'

while True:
    conn, addr = s.accept()
    print 'Got connection from', addr
    data = conn.recv(1024)
    print('Server received', repr(data))

    filename = 'ak.zip'
    b = os.path.getsize(filename)
    f = open(filename, 'rb')
    l = f.read(b)

    while (l):
        conn.send(l)

        l = f.read(b)
    f.close()

    print('Done sending')
    conn.send('Thank you for connecting')
    conn.close()

Client.py

import socket
import time
import os

s = socket.socket()
host = socket.gethostname()
port = 60000
print host
t1 = time.time()
s.connect((host, port))
s.send("Hello server!")

with open('received_file1', 'wb') as f:
    print 'file opened'
    t2 = time.time()
    while True:

        data = s.recv(1024)

        f.write(data)
        t3 = time.time()

        if not data:
            break


    d = os.path.getsize('received_file1')
print data
print d
print 'Total:', t3 - t1
print 'Throughput:', round((d * 0.001) / (t3 - t1), 3),
print 'K/sec.'
f.close()
print('Successfully received the file')
s.close()
print('connection closed')

Output on client side file opened

Total: 0.0469999313354
Throughput: 136213.986 K/sec.
Successfully received the file
connection closed

What I have tried:

Have worked to find throughput in one direction, but unable to do so for the other direction (at the same time)