Here I as producers and consumers templates to write their own a computer wallpaper for the demo,
This demo consumers while True judgment of the line
If I judge, then he will not perform the following to save the picture code,
If without this judgment, then he will download, but on will not automatically end,
Anyone who can help me to solve it the end of this automatic,

 import requests 
The from LXML import etree 
The from urllib import request 
From the queue the import queue 
The import OS 
The import threading 
HEASERS={
'the user-agent' : 'Mozilla/5.0 (Windows NT 6.1; Win64. X64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36 '
} 
# producers 
Class Producer (threading. Thread) : 
Domain_name='http://www.netbian.com' 
Def __init__ (self, page_queue, img_queue, * args, * * kwargs) : 
Super (Producer, self) __init__ (* args, * * kwargs) 
Self. Page_queue=page_queue 
Self. Img_queue=img_queue 

Def run (self) : 
While True: 
If self. Page_queue. Empty () : 
Break 
Url=self. Page_queue. The get () 
Self. Get_detail_urls (url) 
# get images under the first page address 
Def get_detail_urls (self, url) : 
The response=requests. Get (url=url, headers=HEASERS) 
Text=the response. The text 
HTML=etree. HTML (text) 
The lis=HTML. Xpath ('//div/@//li//a/@ href ') 
For li in lis: 
Href=(' href 'https://bbs.csdn.net/topics/li.get 
# self. Img_queue. Put (self domain_name + href) 
Self. Set_detail_urls (self. Domain_name + href) 

# get high-definition pictures under the second page address 
Def set_detail_urls (self, url) : 
The response=requests. Get (url=url, headers=HEASERS) 
Text=response. Content. decode (' GBK ') 
HTML=etree. HTML (text) 
The lis=HTML. Xpath ('//div/@//img/@ SRC ') 
For li in lis: 
SRC=https://bbs.csdn.net/topics/li.get (' SRC ') 
Alt=li. Get (' Alt ') 
Suffix=OS. Path. Splitext (SRC) [1] 
Self. Img_queue. Put ((SRC, Alt + suffix)) 

# print (self) page_queue) qsize ()) 
# print (self) img_queue) qsize ()) 

# consumers download 
Class Consumer (threading. Thread) : 
Def __init__ (self, page_queue, img_queue, * args, * * kwargs) : 
The self, super (Consumer) __init__ (* args, * * kwargs) 
Self. Page_queue=page_queue 
Self. Img_queue=img_queue 
# get img_queue queue data in a 

Def run (self) : 
While True: 
If self. Page_queue. Empty () and the self. The img_queue. Empty () : 
Break 
Url, Alt=self. Img_queue. The get () 
Request. Urlretrieve (url, "imgs/+ Alt) 
Print (Alt + 'the download is complete! ') 

Def the main () : 
# to create a production two queues, a consumer 
Page_queue=Queue (100) 
Img_queue=Queue (1000) 

Base_url='http://www.netbian.com/e/sch/index.php? Page={} & amp; The rid_device_info_keyboard=B6 AF FE& C2 % % % %; Totalnum=1062 '
For the x in the range (0, 1) : 
Url=base_url. The format (x) 
Page_queue. Put (url) 

For x in range (5) : 
T=Producer (page_queue img_queue) 
T.s tart () 

For x in range (5) : 
T=Consumer (page_queue img_queue) 
T.s tart () 
If __name__=="__main__ ': 
The main ()