Python线程实例常用方法及属性设置

def run(self):

print("%s's first thread!!!"% self.name)

time.sleep(5)

mike = mythread('mike')

jone = mythread('jone')

mike.start()

jone.start()

线程threading.Thread实例常用方法

可以通过help(threading.Thread)查看线程实例所有方法

1.start()

help解释：Start the thread’s activity

启动线程

2.join()

help解释：Wait until the thread terminates

阻塞线程直至线程终止，然后在继续运行

'''

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'''

import time

import threading

def thread_run(name):

time.sleep(2)

print("%s's first thread!!!"% name)

mike = threading.Thread(target=thread_run, args=('Mike', ))

jone = threading.Thread(target=thread_run, args=('jone', ))

mike.start()

jone.start()

mike.join() #阻塞子线程mike直到mike线程执行完毕

jone.join() #阻塞子线程jone直到jone线程执行完毕

print('main thread is running!!!')

执行结果：

jone's first thread!!!

Mike's first thread!!!

main thread is running!!!

如果上面列子不执行join()，主线程先执行，然后才会执行子线程mike和jone

import time

import threading

def thread_run(name):

time.sleep(2)

print("%s's first thread!!!"% name)

mike = threading.Thread(target=thread_run, args=('Mike', ))

jone = threading.Thread(target=thread_run, args=('jone', ))

mike.start()

jone.start()

#mike.join() #阻塞子线程mike

#jone.join() #阻塞子线程jone

print('main thread is running!!!')

执行结果：

main thread is running!!!

jone's first thread!!!

Mike's first thread!!!

3. isAlive = is_alive(self)

help解释：Return whether the thread is alive.

这个方法用于判断线程是否运行。

• 当线程未调用 start()来开启时，isAlive()会返回False

• 但线程已经执行后并结束时，isAlive()也会返回False

'''

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'''

import time

import threading

def thread_run(name):

time.sleep(2)

print("%s's first thread!!!"% name)

mike = threading.Thread(target=thread_run, args=('Mike', ))

jone = threading.Thread(target=thread_run, args=('jone', ))

mike.start()

jone.start()

print('isAlive status: %s'% mike.isAlive())

print('is_alive status: %s' %mike.is_alive())

print('main thread is running!!!')

执行结果：

isAlive status: True

is_alive status: True

main thread is running!!!

Mike's first thread!!!

jone's first thread!!!

4. name

help解释：A string used for identification purposes only.

name属性表示线程的线程名 默认是 Thread-x x是序号，由1开始，第一个创建的线程名字就是 Thread-1

import time

import threading

def thread_run(name):

print("%s's first thread!!!"% name)

time.sleep(5)

mike = threading.Thread(target=thread_run, args=('Mike', ), name='Thread-mike') #name设置线程名

jone = threading.Thread(target=thread_run, args=('jone', )) #默认线程name是Thread-X

mike.start()

jone.start()

print(mike.name) #打印线程名

print(jone.name) #打印线程名

执行结果：

Mike's first thread!!!

jone's first thread!!!

Thread-mike

Thread-1

5. setName()

用于设置线程的名称name

'''

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'''

import time

import threading

def thread_run(name):

print("%s's first thread!!!"% name)

time.sleep(5)

mike = threading.Thread(target=thread_run, args=('Mike', ))

jone = threading.Thread(target=thread_run, args=('jone', )) #默认线程name是Thread-X

mike.setName('Thread-mike') #name设置线程名

mike.start()

jone.start()

print(mike.name) #打印线程名

print(jone.name) #打印线程名

执行结果：

Mike's first thread!!!

jone's first thread!!!

Thread-mike

Thread-2

6. getName()

获取线程名称name

'''

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'''

import time

import threading

def thread_run(name):

print("%s's first thread!!!"% name)

time.sleep(5)

mike = threading.Thread(target=thread_run, args=('Mike', ))

jone = threading.Thread(target=thread_run, args=('jone', )) #默认线程name是Thread-X

mike.setName('Thread-mike') #name设置线程名

mike.start()

jone.start()

print(mike.getName()) #打印线程名

print(jone.getName()) #打印线程名

7. daemon

help解释：A boolean value indicating whether this thread is a daemon thread

当 daemon = False 时，线程不会随主线程退出而退出（默认时，就是 daemon = False）

当 daemon = True 时，当主线程结束，其他子线程就会被强制结束

import time

import threading

def thread_mike_run(name):

time.sleep(1)

print('mike thread is running 1S')

time.sleep(5)

print("%s's first thread!!!"% name)

def thread_jone_run(name):

time.sleep(2)

print("%s's first thread!!!"% name)

mike = threading.Thread(target=thread_mike_run, args=('Mike', ), daemon=True) #设置daemon为True

#mike = threading.Thread(target=thread_mike_run, args=('Mike', ))

jone = threading.Thread(target=thread_jone_run, args=('jone', ))

mike.start()

jone.start()

print('main thread') #由于线程没有join()，所以主线程会先运行；而jone的daemon为false，所以主线程会等待jone线程运行完毕；但是mike的daemon为True，所以主线程不会等待mike线程

执行结果：

main thread

mike thread is running 1S #mike线程只执行了1S的print，5S的为执行就直接退出了

jone's first thread!!!

8. setDaemon()