From 6762e5c7b557c6c39eb8ff8ff436115400594fb2 Mon Sep 17 00:00:00 2001
From: Christopher Amin <camin@ripe.net>
Date: Fri, 12 Feb 2016 12:09:07 +0100
Subject: [PATCH] Add __nonzero__ method to ParsingDict so that keys() isn't
 called if you evaluate its truthiness

---
 ripe/atlas/sagan/base.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ripe/atlas/sagan/base.py b/ripe/atlas/sagan/base.py
index 604cd83..cb141ef 100644
--- a/ripe/atlas/sagan/base.py
+++ b/ripe/atlas/sagan/base.py
@@ -89,6 +89,11 @@ def __init__(self, **kwargs):
         self._on_malformation = kwargs.pop("on_malformation", self.ACTION_WARN)
         self.is_malformed = False
 
+    def __nonzero__(self):
+        # If we don't define this, Python ends up calling keys()
+        # via __len__()  whenever we evaluate the object as a bool.
+        return True
+
     def __len__(self):
         return len(self.keys())