Python 限制线程的最大数量(Sem

import threading  import time    sem=threading.Semaphore(4)  #限制线程的最大数量为4个    def gothread():      with  sem:  #锁定线程的最大数量          for i in range(8):              print(threading.current_thread().name,i)              time.sleep(1)    for i in range(5):      threading.Thread(target=gothread).start()