Use _default method instead of redefining trait

IPython/nbconvert/exporters/latex.py

@@ -1,90 +1,89 b''
 """LaTeX Exporter class"""
 
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # Stdlib imports
 import os
 
 # IPython imports
 from IPython.utils.traitlets import Unicode
 from IPython.config import Config
 
 from IPython.nbconvert import filters, preprocessors
 from .templateexporter import TemplateExporter
 
 #-----------------------------------------------------------------------------
 # Classes and functions
 #-----------------------------------------------------------------------------
 
 class LatexExporter(TemplateExporter):
     """
     Exports to a Latex template.  Inherit from this class if your template is
     LaTeX based and you need custom tranformers/filters.  Inherit from it if 
     you are writing your own HTML template and need custom tranformers/filters.  
     If you don't need custom tranformers/filters, just change the 
     'template_file' config option.  Place your template in the special "/latex" 
     subfolder of the "../templates" folder.
     """
 
     def _file_extension_default(self):
         return 'tex'
 
     def _template_file_default(self):
         return 'article'
 
     #Latex constants
     def _default_template_path_default(self):
         return os.path.join("..", "templates", "latex")
 
-    template_skeleton_path = Unicode(
-        os.path.join("..", "templates", "latex", "skeleton"), config=True,
-        help="Path where the template skeleton files are located.") 
+    def _template_skeleton_path_default(self):
+        return os.path.join("..", "templates", "latex", "skeleton")
 
     #Special Jinja2 syntax that will not conflict when exporting latex.
     jinja_comment_block_start = Unicode("((=", config=True)
     jinja_comment_block_end = Unicode("=))", config=True)
     jinja_variable_block_start = Unicode("(((", config=True)
     jinja_variable_block_end = Unicode(")))", config=True)
     jinja_logic_block_start = Unicode("((*", config=True)
     jinja_logic_block_end = Unicode("*))", config=True)
     
     #Extension that the template files use.    
     template_extension = Unicode(".tplx", config=True)
 
     output_mimetype = 'text/latex'
 
 
     @property
     def default_config(self):
         c = Config({
             'NbConvertBase': {
                 'display_data_priority' : ['latex', 'pdf', 'png', 'jpg', 'svg', 'jpeg', 'text']
                 },
              'ExtractOutputPreprocessor': {
                     'enabled':True
                  },
              'SVG2PDFPreprocessor': {
                     'enabled':True
                  },
              'LatexPreprocessor': {
                     'enabled':True
                  },
              'SphinxPreprocessor': {
                     'enabled':True
                  },
              'HighlightMagicsPreprocessor': {
                     'enabled':True
                  }
          })
         c.merge(super(LatexExporter,self).default_config)
         return c