python time.sleep()是睡眠线程还是进程

import time
from threading import Thread
class worker(Thread):
  def run(self):
    for x in xrange(0,11):
      print x
      time.sleep(1)
class waiter(Thread):
  def run(self):
    for x in xrange(100,103):
      print x
      time.sleep(5)
def run():
  worker().start()
  waiter().start()

# 例1：循环输出休眠1秒
import time
i = 1
while i <= 3:
  print i # 输出i
  i += 1
  time.sleep(1) # 休眠1秒1234567

# 例2：循环输出休眠100毫秒
import time
i = 1
while i <= 3:
  print i # 输出i
  i += 1
  time.sleep(0.1) # 休眠0.1秒