Apparently python 2 does not have lru_cache.

Gallopsled · Oct 27, 2020 · 681be12 · 681be12
1 parent 40b0158
commit 681be12
Showing 1 changed file with 6 additions and 4 deletions.
diff --git a/pwnlib/update.py b/pwnlib/update.py
@@ -27,7 +27,6 @@
 import os
 import time
 
-from functools import lru_cache
 from six.moves.xmlrpc_client import ServerProxy
 
 import packaging.version
@@ -67,7 +66,6 @@ def read_update_config(settings):
 
 register_config('update', read_update_config)
 
-@lru_cache
 def available_on_pypi(prerelease=current_version.is_prerelease):
     """Return True if an update is available on PyPI.
 
@@ -76,8 +74,12 @@ def available_on_pypi(prerelease=current_version.is_prerelease):
     >>> available_on_pypi(prerelease=False).is_prerelease
     False
     """
-    client = ServerProxy('https://pypi.python.org/pypi')
-    versions = client.package_releases('pwntools', True)
+    versions = getattr(available_on_pypi, 'cached', None)
+    if versions is None:
+        client = ServerProxy('https://pypi.python.org/pypi')
+        versions = client.package_releases('pwntools', True)
+        available_on_pypi.cached = versions
+
     versions = map(packaging.version.Version, versions)
 
     if not prerelease: