Wrap import to raise a helpful error.

Author: theengineear

Diff for: plotly/graph_objs/graph_objs_tools.py

@@ -4,8 +4,16 @@
 import os
 import sys
 if sys.version[:3] == '2.6':
-    from ordereddict import OrderedDict
-    import simplejson as json
+    try:
+        from ordereddict import OrderedDict
+        import simplejson as json
+    except ImportError:
+        raise ImportError(
+            "Looks like you're running Python 2.6. Plotly expects newer "
+            "standard library versions of ordereddict and json. You can "
+            "simply upgrade with these 'extras' with the following terminal "
+            "command:\npip install 'plotly[PY2.6]'"
+        )
 else:
     from collections import OrderedDict
     import json