Python 多協程實驗時報錯 Error: maximum recursion depth exceeded 程序退出代碼1073741571

在多協程程序代碼過程中，試驗了一個小項目，獲取上千個url中頁面，代碼如下：

import gevent
from gevent.queue import Queue
import time
import requests

from gevent import monkey#把下面有可能有IO操作的單獨做上標記
monkey.patch_all() # 將IO轉爲異步執行的函數

link_list = []
with open(r'D:\...\alexa.txt', 'r') as file:
    file_list = file.readlines()
    for eachone in file_list:
        link = eachone.split('\t')[1]
        link = link.replace('\n','')
        link_list.append(link)

start = time.time()
def crawler(index):
    Process_id = 'Process-' + str(index)
    while not workQueue.empty():
        url = workQueue.get(timeout=2)
        try:
            r = requests.get(url, timeout=20)
            print (Process_id, workQueue.qsize(), r.status_code, url)
        except Exception as e:
            print (Process_id, workQueue.qsize(), url, 'Error: ', e)

def boss():
    for url in link_list:
        workQueue.put_nowait(url)   #不阻塞地存放消息

if __name__ == '__main__':
    workQueue = Queue(1000