explain some network issues

Author: jhpx

README.md

@@ -4,7 +4,7 @@ This repository includes solutions to the Python Challenge quizzes for practice
 
 Website: [The Python Challenge](http://www.pythonchallenge.com/) — enjoy!
 
-(There are bugs in level_13、level_17 under python 3.13 on 2025.)
+(There are network issues in level_13、level_15、level_17 in China.)
 
 ### Level 0
 2 to 38 = ?

level_13.py

@@ -4,6 +4,7 @@
 # Phone that (remote) evil.
 import re
 import xmlrpc.client
+from ftplib import print_line
 
 PREFIX = "http://huge:file@www.pythonchallenge.com/pc/return/"
 url = PREFIX + '../phonebook.php'
@@ -12,9 +13,10 @@
 def solve(url):
     print("Looking up Bert(Evil):")
     phonebook = xmlrpc.client.ServerProxy(url)
+    # This line will raise an exception if you're within the Great Firewall (GFW).
     response = phonebook.phone('Bert')
     whom = re.findall(r'[A-Z]+', response)[0].lower()
-    println(whom)
+    print_line(whom)
 
     return whom
 

level_15.py

@@ -29,6 +29,7 @@ def solve(year):
     # 1756/01/27
 
     wikiurl = 'https://en.wikipedia.org/wiki/January_27'
+    # This line will raise an exception if you're within the Great Firewall (GFW).
     r = requests.get(wikiurl)
     text = catch(r.text, '<li><a href="/wiki/' + year + '.*?</a>(.*?)</li>')
     text = re.findall(r'<a.*?>(.+?)</a>', text)[0]

level_17.py

@@ -52,6 +52,7 @@ def solve(url):
     import xmlrpc.client
 
     url2 = PREFIX_AUTH + '../phonebook.php'
+    # This line will raise an exception if you're within the Great Firewall (GFW).
     phonebook = xmlrpc.client.ServerProxy(url2)
     response = phonebook.phone('Leopold')
     whom = catch(response, r'[A-Z]+').lower()