Improved flexibility of plot_exps.py script.

* No longer needs an X connection to render. This also vastly increases
performance.
* If too many configuration values are plotted, a key with color=column1,
line=column2, marker=column3 etc is not created. Instead, each combination
of values is given its own line/color/marker style and plotted, and each
line has an entry in the key. Ugly, but better than nothing.

1 files changed, 1 insertions, 1 deletions

diff --git a/parse/col_map.py b/parse/col_map.py
index ccce865..f1f9e52 100644
--- a/parse/col_map.py
+++ b/parse/col_map.py
@@ -45,7 +45,7 @@ class ColMap(object):
 
         for col in self.col_list:
             if col not in kv:
-                key += (None,)
+                key += (str(None),)
             else:
                 key += (str(kv[col]),)