From 6d17aed39fd4b95c6934ddd5e51a9fc01a0aff7a Mon Sep 17 00:00:00 2001
From: Ray Osborn <rayosborn@mac.com>
Date: Fri, 3 Jul 2015 20:04:05 -0500
Subject: [PATCH] Make the plot_shape property a tuple

In all other contexts, shapes are tuples. This returned a list.
---
 src/nexusformat/nexus/tree.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nexusformat/nexus/tree.py b/src/nexusformat/nexus/tree.py
index e8363ed..4d252ac 100644
--- a/src/nexusformat/nexus/tree.py
+++ b/src/nexusformat/nexus/tree.py
@@ -2394,7 +2394,7 @@ def plot_shape(self):
         _shape = list(self.shape)
         while 1 in _shape:
             _shape.remove(1)
-        return _shape
+        return tuple(_shape)
 
     @property
     def plot_rank(self):