Master Python Threading: Create and Manage Threads with Simple Examples

Thread class is used to represent an individual control thread.

Syntax

t = Thread(group=None, target=None, name=None, args=(), kwargs={})

Parameters:

group : reserved for future extension, default None.

target : a callable object that the thread will execute when run() is called.

name : thread name, default creates a unique “Thread‑N” name.

args : tuple of arguments passed to the target function.

kwargs : dictionary of keyword arguments passed to the target.

Common Attributes and Methods

t.start()

: starts the thread by invoking run(); can be called only once. t.run(): method called when the thread starts; by default calls the target function; can be overridden in a subclass. t.join([timeout]): blocks until the thread terminates or timeout (seconds) occurs. Must be called after start. t.is_alive: returns True if the thread is active, otherwise False. t.name: thread name, can be changed. t.ident: integer thread identifier, None if not started. t.daemon: True if the thread is a daemon (background) thread; the program exits when only daemon threads remain.

Example 1: Using Thread object to create a simple thread and start a function

Code:

#利用Thread对象，简单创建一个线程，并启动一个函数
from threading import Thread
import time
def mark(interval):
    print("循环等待时间时间%d,等待前时间：" % (interval, time.ctime()))
    time.sleep(interval)
    print("等待后的时间：" % time.ctime())
if __name__=="__main__":
    t=Thread(target=mark,args=(3,))
    t.daemon=False  # set as non‑daemon thread to keep main thread alive
    t.start()
    print("end")

Result:

Example 2: Subclassing Thread to implement a thread class

Code:

#通过继承Thread，实现线程类
from threading import Thread
import time

class MyThread(Thread):
    def __init__(self, interval):
        #下面语句用来调用基类方法，必须调用
        Thread.__init__(self)
        self.daemon=False
        self.interval=interval
    def run(self):
        print("循环等待时间时间%d,等待前时间：" % (self.interval, time.ctime()))
        time.sleep(self.interval)
        print("等待后的时间：" % time.ctime())

if __name__=="__main__":
    t=MyThread(3)
    t.start()
    time.sleep(1)  # pause to observe output
    print("end")

Result: