From 416f4c7aa7d4fde5cec0874b038c7729e82df368 Mon Sep 17 00:00:00 2001
From: Sebastianw Wehling-Benatelli <sebastian.wehling@rub.de>
Date: Tue, 12 Apr 2016 14:48:57 +0200
Subject: [PATCH] [bugfix] special method __nonzero__ should always return type
 bool

---
 pylot/core/util/pdf.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pylot/core/util/pdf.py b/pylot/core/util/pdf.py
index dddb260f..6f986666 100644
--- a/pylot/core/util/pdf.py
+++ b/pylot/core/util/pdf.py
@@ -154,7 +154,7 @@ class ProbabilityDensityFunction(object):
         prec = self.precision(self.incr)
         gtzero = np.all(self.data >= 0)
         probone = bool(np.round(self.prob_gt_val(self.axis[0]), prec) == 1.)
-        return (gtzero and probone)
+        return bool(gtzero and probone)
 
     def __str__(self):
         return str(self.data)