请教一道 Python 多线程爬虫的面试题

def saveToFile(FileName,srcList):
a=0
srcTuple = (srcList)
FileName = 'os'+FileName.strip()
res = mkdir(FileName)
if res == False:
return False
#os.mkdir(FileName)
os.chdir(FileName)
que = Queue.Queue()
for sl in srcList:
que.put(sl)
for a in range(0,srcList.__len__()):
threadD = threadDownload(que,a)
threadD.start()
#print threading.enumerate()
while threading.active_count() != 0:
if threading.active_count() == 1:
print FileName+" is Done"
return True