python thread多线程

python-thread-loop.py

import threading
import time

thread_num = 0
lock = threading.Lock()

def do_request():
    global thread_num
    # -------------
    # my code here
    # -------------
    with lock:
        thread_num -= 1

while True:
    if thread_num <= 50:
        with lock:
            thread_num += 1
        t = threading.Thread(target=do_request)
        t.start()
    else:
        time.sleep(0.01)