From 39de146775bab2f3c3020283f076c420b1e8d15a 2013-12-13 22:46:51
From: Thomas Kluyver <takowl@gmail.com>
Date: 2013-12-13 22:46:51
Subject: [PATCH] Make output_mimetype accessible from the class.

Traitlets are only accessible by instantiating the class. There's no
clear reason that this needs to be a traitlet, anyway.

---

diff --git a/IPython/nbconvert/exporters/exporter.py b/IPython/nbconvert/exporters/exporter.py
index 26e1fe4..cc77fc7 100644
--- a/IPython/nbconvert/exporters/exporter.py
+++ b/IPython/nbconvert/exporters/exporter.py
@@ -53,9 +53,10 @@ class Exporter(LoggingConfigurable):
         help="Extension of the file that should be written to disk"
         )
 
-    output_mimetype = Unicode('', config=True,
-        help="MIME type of the result file, for HTTP response headers."
-        )
+    # MIME type of the result file, for HTTP response headers.
+    # This is *not* a traitlet, because we want to be able to access it from
+    # the class, not just on instances.
+    output_mimetype = ''
 
     #Configurability, allows the user to easily add filters and preprocessors.
     preprocessors = List(config=True,
diff --git a/IPython/nbconvert/exporters/html.py b/IPython/nbconvert/exporters/html.py
index 95790c1..8cb8675 100644
--- a/IPython/nbconvert/exporters/html.py
+++ b/IPython/nbconvert/exporters/html.py
@@ -43,8 +43,7 @@ class HTMLExporter(TemplateExporter):
     default_template = Unicode('full', config=True, help="""Flavor of the data 
         format to use.  I.E. 'full' or 'basic'""")
     
-    def _output_mimetype_default(self):
-        return 'text/html'
+    output_mimetype = 'text/html'
     
     @property
     def default_config(self):
diff --git a/IPython/nbconvert/exporters/latex.py b/IPython/nbconvert/exporters/latex.py
index 551e535..0a94b9d 100644
--- a/IPython/nbconvert/exporters/latex.py
+++ b/IPython/nbconvert/exporters/latex.py
@@ -63,8 +63,7 @@ class LatexExporter(TemplateExporter):
     #Extension that the template files use.    
     template_extension = Unicode(".tplx", config=True)
 
-    def _output_mimetype_default(self):
-        return 'text/latex'
+    output_mimetype = 'text/latex'
 
 
     @property
diff --git a/IPython/nbconvert/exporters/markdown.py b/IPython/nbconvert/exporters/markdown.py
index 4013c3f..6a888ae 100644
--- a/IPython/nbconvert/exporters/markdown.py
+++ b/IPython/nbconvert/exporters/markdown.py
@@ -30,8 +30,7 @@ class MarkdownExporter(TemplateExporter):
         'md', config=True, 
         help="Extension of the file that should be written to disk")
 
-    def _output_mimetype_default(self):
-        return 'text/markdown'
+    output_mimetype = 'text/markdown'
     
     def _raw_mimetypes_default(self):
         return ['text/markdown', 'text/html', '']
diff --git a/IPython/nbconvert/exporters/python.py b/IPython/nbconvert/exporters/python.py
index 750b0ac..b5a4293 100644
--- a/IPython/nbconvert/exporters/python.py
+++ b/IPython/nbconvert/exporters/python.py
@@ -29,5 +29,4 @@ class PythonExporter(TemplateExporter):
         'py', config=True, 
         help="Extension of the file that should be written to disk")
 
-    def _output_mimetype_default(self):
-        return 'text/x-python'
+    output_mimetype = 'text/x-python'
diff --git a/IPython/nbconvert/exporters/rst.py b/IPython/nbconvert/exporters/rst.py
index 0bf4ead..e401c99 100644
--- a/IPython/nbconvert/exporters/rst.py
+++ b/IPython/nbconvert/exporters/rst.py
@@ -30,8 +30,7 @@ class RSTExporter(TemplateExporter):
         'rst', config=True, 
         help="Extension of the file that should be written to disk")
 
-    def _output_mimetype_default(self):
-        return 'text/restructuredtext'
+    output_mimetype = 'text/restructuredtext'
 
     @property
     def default_config(self):
diff --git a/IPython/nbconvert/exporters/slides.py b/IPython/nbconvert/exporters/slides.py
index 6b59e00..1a4ebec 100644
--- a/IPython/nbconvert/exporters/slides.py
+++ b/IPython/nbconvert/exporters/slides.py
@@ -31,8 +31,7 @@ class SlidesExporter(HTMLExporter):
         help="Extension of the file that should be written to disk"
         )
 
-    def _output_mimetype_default(self):
-        return 'text/html'
+    output_mimetype = 'text/html'
 
     default_template = Unicode('reveal', config=True, help="""Template of the 
         data format to use.  I.E. 'reveal'""")
diff --git a/IPython/nbconvert/exporters/templateexporter.py b/IPython/nbconvert/exporters/templateexporter.py
index cdc1ee6..e127ab9 100644
--- a/IPython/nbconvert/exporters/templateexporter.py
+++ b/IPython/nbconvert/exporters/templateexporter.py
@@ -126,8 +126,6 @@ class TemplateExporter(Exporter):
         help="""Dictionary of filters, by name and namespace, to add to the Jinja
         environment.""")
 
-    output_mimetype = Unicode('')
-
     raw_mimetypes = List(config=True,
         help="""formats of raw cells to be included in this Exporter's output."""
     )