backports/weakref was denied for all except of backports/weakref
@@ -140,3 +140,8 @@ DENY .* -> contrib/deprecated/python/diff2html
# usage restriction
ALLOW yweb/antimalware/ -> contrib/libs/sophos
DENY .* -> contrib/libs/sophos
+
+# contrib/python/backports should not be used in new projects because we want
+# to start new projects on Py3
+ALLOW contrib/python/backports/tempfile -> contrib/python/backports/weakref
+DENY .* -> contrib/python/backports/weakref
