From 4705a302fecee356b3c7bc49910d063016ae9bc1 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Thu, 27 Sep 2018 16:29:21 +0200
Subject: [PATCH] Clarify missing-property error message.

The error message is modelled like CPython's normal AttributeError
message ('foo' object has no attribute 'bar').
---
 lib/matplotlib/artist.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/matplotlib/artist.py b/lib/matplotlib/artist.py
index bb2a2de6b0e9..799cc0cd93f8 100644
--- a/lib/matplotlib/artist.py
+++ b/lib/matplotlib/artist.py
@@ -965,7 +965,8 @@ def _update_property(self, k, v):
             else:
                 func = getattr(self, 'set_' + k, None)
                 if not callable(func):
-                    raise AttributeError('Unknown property %s' % k)
+                    raise AttributeError('{!r} object has no property {!r}'
+                                         .format(type(self).__name__, k))
                 return func(v)
 
         with cbook._setattr_cm(self, eventson=False):