From 2b81848faa091486c40c8187de72200526bfc0fd Mon Sep 17 00:00:00 2001
From: Skipper Seabold <jsseabold@gmail.com>
Date: Thu, 24 Apr 2014 14:06:00 -0400
Subject: [PATCH] MAINT: Numpy deprecated boolean unary '-' operator

---
 pandas/core/common.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/core/common.py b/pandas/core/common.py
index 18a3dba1a44a4..ad5d14989b742 100644
--- a/pandas/core/common.py
+++ b/pandas/core/common.py
@@ -280,7 +280,7 @@ def notnull(obj):
     res = isnull(obj)
     if np.isscalar(res):
         return not res
-    return -res
+    return ~res
 
 def _is_null_datelike_scalar(other):
     """ test whether the object is a null datelike, e.g. Nat