Автозакрытие Thread после выполнения

import urllib2
import time
import json
import threading
 
 
BBBBB = open("ddddd.txt", "a")
def scan(aaaaa):
    urlRequest = urllib2.Request("https://xxx=" + aaaaa)
    data = urllib2.urlopen(urlRequest).read()
    json_data = json.loads(data)
    if json_data["result"]>"0":
            BBBBB.write("BBBBB of " + aaaaa + " is " + str(json_data["result"]) + "\n") 
    print ("BBBBB of " + aaaaa + " is " + str(json_data["result"]) + "\n")
 
def main():
    f = open("rass1.txt", "r")
    for line in f:
        t = threading.Thread(target=scan, args=(line,))
        t.daemon = True
        time.sleep(0)
        t.start()
 
if __name__ == '__main__':
    main()

  File "G:\python\lib\threading.py", line 736, in start
    _start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread

import urllib2
import time
import json
import threading
threadArray =[]
 
balances = open("ddddd.txt", "a")
def scan(address):
    urlRequest = urllib2.Request("https://api.etherscan.io/api?module=account&action=balance&address=" + address)
    data = urllib2.urlopen(urlRequest).read()
    json_data = json.loads(data)
    if json_data["result"]>"0":
            balances.write("Balance of " + address + " is " + str(json_data["result"]) + "\n")
    print ("Balance of " + address + " is " + str(json_data["result"]) + "\n")
 
def main():
    f = open("rass1.txt", "r")
    for line in f:
        threadArray.append(threading.Thread(target=scan, args=(line,)))
        threadArray[-1].start()
        time.sleep(0.01)
    
if __name__ == '__main__':
    main()

def main():
    f = open("rass1.txt", "r")
    for line in f:

for t in range(thread_count):

    task_count = 100
    tasks = range(task_count)
    for task in tasks:
        work_queue.put(task)

    f = open("rass1.txt", "r")
    for line in f:
       work_queue.put(line)

    import queue
ImportError: No module named queue

g:\>easy_install-2.7 queue
Searching for queue
Reading [url]https://pypi.python.org/simple/queue/[/url]
No local packages or working download links found for queue
error: Could not find suitable distribution for Requirement.parse('queue')
 
g:\>pip2.7 install queue
Collecting queue
  Could not find a version that satisfies the requirement queue (from versions:
)
No matching distribution found for queue