Python 线程模块。不确定我是否创建了多个线程

我正在尝试学习“线程”模块。但是，我不确定我是否能够创建多个线程

import threading
import time
def somefunction():
    for loop in range (10):
        print "thread sleeps for 20 seconds"
        time.sleep(20)
        print "thread %d woke up"

counter = 0
while counter < 10:
     threader = threading.Thread(target=somefunction())
     counter = counter +1

---

我做错了什么？

您必须使用参数

target

中对

somefunction

的引用，而不是调用该函数

import threading
import time
def somefunction():
    for loop in range (10):
        print "thread sleeps for 20 seconds"
        time.sleep(20)
        print "thread %d woke up"

for counter in range(10):
     threader = threading.Thread(target=somefunction)

---

非常感谢。它起作用了。不过，我有一个问题。为了关闭所有线程，我可以在代码末尾添加这个？threader.join（）

import threading
import time
def somefunction():
    for loop in range (10):
        print "thread sleeps for 20 seconds"
        time.sleep(20)
        print "thread %d woke up"

for counter in range(10):
     threader = threading.Thread(target=somefunction)