import threading
def run(name):
  for i in range(3):
　　  print(name)
if __name__ == '__main__':
  t1 = threading.Thread(target=run, args=("t1",))
  t2 = threading.Thread(target=run, args=("t2",))
  t1.start()
  t2.start()

--------------------------------------------
t1
t2
t2
t1
t2
t1

import threading
class MyThread(threading.Thread):
  def __init__(self, name):
    super(MyThread, self).__init__()
    self.name = name
  def run(self):
    for i in range(3):
      print(self.name)
if __name__ == "__main__":
  t1 = MyThread("t1")
  t2 = MyThread("t2")
  t1.start()
  t2.start()

from threading import Thread,Lock
n = 10
def run():
  global n
  locker.acquire()
  n -= 1
  locker.release()

if __name__ == '__main__':
  locker = Lock()
  t1 = Thread(target=run)
  t2 = Thread(target=run)
  t1.start()
  t2.start()