import re
import ast
import requests

def get_nodes_json():
left_menu_text = requests.get(“https://bbs.csdn.net/dynamic_js/left_menu.js?csdn”).text
nodes_str_match = re.search(“forumNodes: (.*])”,left_menu_text)

if nodes_str_match:
    nodes_str = nodes_str_match.group(1).replace("null","None")
    nodes_list = ast.literal_eval(nodes_str)
    return nodes_list
return []

url_list = []
def process_nodes_list(nodes_list):
for item in nodes_list:
if “url” in item:
if “url” in item:
url_list.append(item[“url”])
if “chidlren” in item:
process_nodes_list(item[“chidlren”])
def get_level1_list(nodes_list):
level1_url = []
for item in nodes_list:
if “url” in item and item[“url”]:
level1_url.append(item[“url”])

return level1_url

nodes_list = get_nodes_json()
process_nodes_list(nodes_list)
level1_url = get_level1_list(nodes_list)
last_urls=[]
for url in url_list:
if url not in level1_url:
last_urls.append(url)
print(last_urls)
print(len(last_urls))