线程模块练习
1.主线程 import threading t = threading.current_thread() print(t) # <_MainThread(MainThread, started 139908235814720)> print(t.getName()) # MainThread print(t.ident) # 139908235814720 print(t.isAlive()) # True 2.创建线程 my_thread = threading.Thread() my_thread = threading.Thread(name='my_thread') def print_i(i): print('打印i:%d'%(i,)) my_thread = threading.Thread(target=print_i,args=(1,)) my_thread().start() 3 交替获得CPU时间片 import time from datetime import datetime import threading def print_time(): for _ in range(5): # 在每个线程中打印5次 time.sleep(0.1) # 模拟打印前的相关处理逻辑 print('当前线程%s,打印结束时间为:%s'%(threading.current_thread().getName(),datetime.today())) threads = [threading.Thread(name='t%d'%(i,),target=print_time) for i in range(3)] [t.start() for t in threads] 4.多线程抢夺同一个变量,要加锁 import threading import time locka = threading.Lock() a = 0 def add1(): global a try: locka.acquire() # 获得锁 tmp = a + 1 time.sleep(0.2) # 延时0.2秒,模拟写入所需时间 a = tmp finally: locka.release() # 释放锁 print('%s adds a to 1: %d'%(threading.current_thread().getName(),a)) threads = [threading.Thread(name='t%d'%(i,),target=add1) for i in range(10)] [t.start() for t in threads]