import threading
from collections import OrderedDict
from random import randrange
import time

c = 10000
h = 0
d = OrderedDict([(k, k) for k in range(c)])


class C:
    def __hash__(self):
        global c, h, d
        for i in range(c, c+100000):
            d[i] = 0
        c += 100000
        h += 1
        return h

def f():
    global d
    time.sleep(1)
    d[C()] = d

th = [0] * 10

for i in range(1, 10):
    th[i] = threading.Thread(target=f, args=())
    th[i].start()

for i in range(1, 10):
    th[i].join()