using multi-threading to excute member function in Python

using multi-threading to excute member function in Python

I am trying to use python to code a multi-threading program. Since I am
very new to python, I appologise if I asked something common to you.
Here is my code in main:
multi_threads = []
simulator = Simulation(simulation_number)
# Simulation is my class, run() is a member function
for i in range(0, thread_number):
multi_threads.append(Thread(target = simulator.run, args = (start,
end,)))
for i in range(0, thread_number):
multi_threads[i].start()
multi_threads[i].join()
and in Simulation::run:
def run(self, start, end):
# do something...
print "in run"
return
I expect to see in run few times. But it turns out there is nothing.
May I know what am I wrong? Many thanks in advance.