From 44141d603a4cdcf80820efcc70108c8814f6e0cc Mon Sep 17 00:00:00 2001
From: Nelle Varoquaux <nelle.varoquaux@gmail.com>
Date: Wed, 25 Feb 2015 11:02:04 +0100
Subject: [PATCH] ENH better error message for wrong fontsize

When the fontsize provided is unknown to matplotlib, the error raised now
contains the list of known fontsize.
---
 lib/matplotlib/font_manager.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/matplotlib/font_manager.py b/lib/matplotlib/font_manager.py
index b281aba15d85..bf86649c7e73 100644
--- a/lib/matplotlib/font_manager.py
+++ b/lib/matplotlib/font_manager.py
@@ -899,7 +899,9 @@ def set_size(self, size):
             size = float(size)
         except ValueError:
             if size is not None and size not in font_scalings:
-                raise ValueError("size is invalid")
+                raise ValueError(
+                    "Size is invalid. Valid font size are " + ", ".join(
+                        str(i) for i in font_scalings.keys()))
         self._size = size
 
     def set_file(self, file):