From b59af7a08f21e4367d999ed5c3e7fe68c9e4324a Mon Sep 17 00:00:00 2001
From: Dave Jones <dave@waveform.org.uk>
Date: Sat, 22 Oct 2016 15:48:12 +0100
Subject: [PATCH] Remove py2 incompatible raise in WeakMethod backport

---
 gpiozero/compat.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gpiozero/compat.py b/gpiozero/compat.py
index c8c01a2..0549c77 100644
--- a/gpiozero/compat.py
+++ b/gpiozero/compat.py
@@ -99,7 +99,7 @@ class WeakMethod(weakref.ref):
             func = meth.__func__
         except AttributeError:
             raise TypeError("argument should be a bound method, not {0}"
-                            .format(type(meth))) from None
+                            .format(type(meth)))
         def _cb(arg):
             # The self-weakref trick is needed to avoid creating a reference
             # cycle.