From: Fred Morris <consulting@m3047.net>
Date: Sat, 17 Sep 2016 22:54:28 +0000 (-0700)
Subject: Truthiness of Answers
X-Git-Tag: v1.15.0~23^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4dcfdff670a1c2a0d99600a96f0efaf517b1263d;p=thirdparty%2Fdnspython.git

Truthiness of Answers

Internally it was failing, because the rrset is None and the __len__ method was being invoked and not checking for that.
---

diff --git a/dns/resolver.py b/dns/resolver.py
index 5bd1e8d8..8e8126e4 100644
--- a/dns/resolver.py
+++ b/dns/resolver.py
@@ -271,10 +271,10 @@ class Answer(object):
             raise AttributeError(attr)
 
     def __len__(self):
-        return len(self.rrset)
+        return self.rrset and len(self.rrset) or 0
 
     def __iter__(self):
-        return iter(self.rrset)
+        return self.rrset and iter(self.rrset) or iter(tuple())
 
     def __getitem__(self, i):
         return self.rrset[i]