#!/usr/local/bin/python3
from threading import Thread, local

class C(object):
  l = local()
  l.d = {}
  def __init__(self, n, v):
    self.l.d = {}
    self.l.d[n] = v

def f1():
  C(1, 1)

def f2():
  C(2, 2)

Thread(target=f1).start()
Thread(target=f2).start()
print(C.l.__dict__)