import socket
import time
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('', 11000))
s.listen(10)
def work():
    try:
        conn, addr = s.accept()
        data = conn.recv(16384)
        conn.sendall(data)
    finally:
        conn.close()
try:
    t = time.time()
    col = 0
    while 1:
        col += 1
        if not col%10000:
            t0 = time.time()
            d = t0 - t
            print '%d: %.2fs, b: %.2f' % (col, d, 10000/d)
            t = t0
        work()
finally:
    print 'close socket'
    s.close()

import socket
import time
def work():
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect(('localhost', 11000))
        #s.sendall('0123456789'*115) # <--- no errors
        s.sendall('0123456789'*10) # errors
        data = s.recv(16384)
    except Exception as e:
        print e
        time.sleep(1)
    finally:
        s.close()
col = 0
while 1:
    col += 1
    if not col%10000: print col
    work()

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

    finally:
        conn.shutdown(socket.SHUT_RDWR)
        conn.close()

[Errno 99] Cannot assign requested address
[Errno 99] Cannot assign requested address
[Errno 99] Cannot assign requested address
70000
80000
[Errno 99] Cannot assign requested address
....
[Errno 99] Cannot assign requested address
90000
100000
110000
[Errno 99] Cannot assign requested address