线程常用方法及常见特性

from threading import Thread
import time


def func(arg):
    time.sleep(2)
    print(arg)

p1 = Thread(target=func, args=(1,))  #创建线程
p2 = Thread(target=func, args=(2,))
p1.start()      #启动线程
p2.start()
print(123)

from threading import Thread
import time


def func(arg):
    time.sleep(2)
    print(arg)

p1 = Thread(target=func, args=(1,))
p2 = Thread(target=func, args=(2,))
p1.setDaemon(True)         #参数为True 设置为守护线程，随主线程结束而结束
#p1.setDaemon(False)  
p1.start()
p2.setDaemon(True)
#p1.setDaemon(False)  
p2.start()

from threading import Thread
import time


def func(arg):
    time.sleep(2)
    print(arg)

print(‘主线程1段‘)
p1 = Thread(target=func, args=(1,))
p2 = Thread(target=func, args=(2,))
p1.start()
p1.join()      #主线程等待此线程的结束在继续执行
print(‘主线程2段‘)
p2.start()
p2.join()
print(‘主线程3段‘)
print(123)

from threading import Thread,current_thread

def func(arg):
    t = current_thread()  #获取线程
    print(arg, t)
p1 = Thread(target=func, args=(1,))
p1.setName("第一个线程")   #为线程设置别名
p2 = Thread(target=func, args=(2,))
p2.setName("第二个线程")
p1.start()
p2.start()

from threading import Thread,RLock
lock = RLock()      # 定义个锁
n = 10
def change(arg):
    lock.acquire()  #获取钥匙
    global n
    n = i
    print(n)
    lock.release()  #归还钥匙

for i in range(10):
    t = Thread(target=change, args=(i,))
    t.start()