Remove docstring_nbformat_mod decorator

IPython/nbconvert/exporters/exporter.py

@@ -1,277 +1,276 b''
 """This module defines a base Exporter class. For Jinja template-based export,
 see templateexporter.py.
 """
 
 #-----------------------------------------------------------------------------
 # 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
 #-----------------------------------------------------------------------------
 
 from __future__ import print_function, absolute_import
 
 # Stdlib imports
 import io
 import os
 import copy
 import collections
 import datetime
 
 
 # IPython imports
 from IPython.config.configurable import LoggingConfigurable
 from IPython.config import Config
 from IPython.nbformat import current as nbformat
 from IPython.utils.traitlets import MetaHasTraits, Unicode, List
 from IPython.utils.importstring import import_item
 from IPython.utils import text, py3compat
 
 #-----------------------------------------------------------------------------
 # Class
 #-----------------------------------------------------------------------------
 
 class ResourcesDict(collections.defaultdict):
     def __missing__(self, key):
         return ''
 
 
 class Exporter(LoggingConfigurable):
     """
     Class containing methods that sequentially run a list of preprocessors on a 
     NotebookNode object and then return the modified NotebookNode object and 
     accompanying resources dict.
     """
 
     file_extension = Unicode(
         'txt', config=True,
         help="Extension of the file that should be written to disk"
         )
 
     # 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,
         help="""List of preprocessors, by name or namespace, to enable.""")
 
     _preprocessors = List()
 
     default_preprocessors = List(['IPython.nbconvert.preprocessors.coalesce_streams',
                                   'IPython.nbconvert.preprocessors.SVG2PDFPreprocessor',
                                   'IPython.nbconvert.preprocessors.ExtractOutputPreprocessor',
                                   'IPython.nbconvert.preprocessors.CSSHTMLHeaderPreprocessor',
                                   'IPython.nbconvert.preprocessors.RevealHelpPreprocessor',
                                   'IPython.nbconvert.preprocessors.LatexPreprocessor',
                                   'IPython.nbconvert.preprocessors.ClearOutputPreprocessor',
                                   'IPython.nbconvert.preprocessors.ExecutePreprocessor',
                                   'IPython.nbconvert.preprocessors.HighlightMagicsPreprocessor'],
         config=True,
         help="""List of preprocessors available by default, by name, namespace, 
         instance, or type.""")
 
 
     def __init__(self, config=None, **kw):
         """
         Public constructor
 
         Parameters
         ----------
         config : config
             User configuration instance.
         """
         with_default_config = self.default_config
         if config:
             with_default_config.merge(config)
         
         super(Exporter, self).__init__(config=with_default_config, **kw)
 
         self._init_preprocessors()
 
 
     @property
     def default_config(self):
         return Config()
 
-    @nbformat.docstring_nbformat_mod
     def from_notebook_node(self, nb, resources=None, **kw):
         """
         Convert a notebook from a notebook node instance.
 
         Parameters
         ----------
-        nb : :class:`~{nbformat_mod}.nbbase.NotebookNode`
+        nb : :class:`~IPython.nbformat.current.NotebookNode`
           Notebook node
         resources : dict
           Additional resources that can be accessed read/write by
           preprocessors and filters.
         **kw
           Ignored (?)
         """
         nb_copy = copy.deepcopy(nb)
         resources = self._init_resources(resources)
         
         if 'language' in nb['metadata']:
             resources['language'] = nb['metadata']['language'].lower()
 
         # Preprocess
         nb_copy, resources = self._preprocess(nb_copy, resources)
 
         return nb_copy, resources
 
 
     def from_filename(self, filename, resources=None, **kw):
         """
         Convert a notebook from a notebook file.
 
         Parameters
         ----------
         filename : str
             Full filename of the notebook file to open and convert.
         """
 
         # Pull the metadata from the filesystem.
         if resources is None:
             resources = ResourcesDict()
         if not 'metadata' in resources or resources['metadata'] == '':
             resources['metadata'] = ResourcesDict()
         basename = os.path.basename(filename)
         notebook_name = basename[:basename.rfind('.')]
         resources['metadata']['name'] = notebook_name
 
         modified_date = datetime.datetime.fromtimestamp(os.path.getmtime(filename))
         resources['metadata']['modified_date'] = modified_date.strftime(text.date_format)
 
         with io.open(filename, encoding='utf-8') as f:
             return self.from_notebook_node(nbformat.read(f, 'json'), resources=resources, **kw)
 
 
     def from_file(self, file_stream, resources=None, **kw):
         """
         Convert a notebook from a notebook file.
 
         Parameters
         ----------
         file_stream : file-like object
             Notebook file-like object to convert.
         """
         return self.from_notebook_node(nbformat.read(file_stream, 'json'), resources=resources, **kw)
 
 
     def register_preprocessor(self, preprocessor, enabled=False):
         """
         Register a preprocessor.
         Preprocessors are classes that act upon the notebook before it is
         passed into the Jinja templating engine.  preprocessors are also
         capable of passing additional information to the Jinja
         templating engine.
 
         Parameters
         ----------
         preprocessor : preprocessor
         """
         if preprocessor is None:
             raise TypeError('preprocessor')
         isclass = isinstance(preprocessor, type)
         constructed = not isclass
 
         # Handle preprocessor's registration based on it's type
         if constructed and isinstance(preprocessor, py3compat.string_types):
             # Preprocessor is a string, import the namespace and recursively call
             # this register_preprocessor method
             preprocessor_cls = import_item(preprocessor)
             return self.register_preprocessor(preprocessor_cls, enabled)
 
         if constructed and hasattr(preprocessor, '__call__'):
             # Preprocessor is a function, no need to construct it.
             # Register and return the preprocessor.
             if enabled:
                 preprocessor.enabled = True
             self._preprocessors.append(preprocessor)
             return preprocessor
 
         elif isclass and isinstance(preprocessor, MetaHasTraits):
             # Preprocessor is configurable.  Make sure to pass in new default for 
             # the enabled flag if one was specified.
             self.register_preprocessor(preprocessor(parent=self), enabled)
 
         elif isclass:
             # Preprocessor is not configurable, construct it
             self.register_preprocessor(preprocessor(), enabled)
 
         else:
             # Preprocessor is an instance of something without a __call__ 
             # attribute.  
             raise TypeError('preprocessor')
 
 
     def _init_preprocessors(self):
         """
         Register all of the preprocessors needed for this exporter, disabled
         unless specified explicitly.
         """
         self._preprocessors = []
 
         # Load default preprocessors (not necessarly enabled by default).
         for preprocessor in self.default_preprocessors:
             self.register_preprocessor(preprocessor)
 
         # Load user-specified preprocessors.  Enable by default.
         for preprocessor in self.preprocessors:
             self.register_preprocessor(preprocessor, enabled=True)
 
 
     def _init_resources(self, resources):
 
         #Make sure the resources dict is of ResourcesDict type.
         if resources is None:
             resources = ResourcesDict()
         if not isinstance(resources, ResourcesDict):
             new_resources = ResourcesDict()
             new_resources.update(resources)
             resources = new_resources
 
         #Make sure the metadata extension exists in resources
         if 'metadata' in resources:
             if not isinstance(resources['metadata'], ResourcesDict):
                 resources['metadata'] = ResourcesDict(resources['metadata'])
         else:
             resources['metadata'] = ResourcesDict()
             if not resources['metadata']['name']:
                 resources['metadata']['name'] = 'Notebook'
 
         #Set the output extension
         resources['output_extension'] = self.file_extension
         return resources
 
 
     def _preprocess(self, nb, resources):
         """
         Preprocess the notebook before passing it into the Jinja engine.
         To preprocess the notebook is to apply all of the
 
         Parameters
         ----------
         nb : notebook node
             notebook that is being exported.
         resources : a dict of additional resources that
             can be accessed read/write by preprocessors
         """
 
         # Do a copy.deepcopy first,
         # we are never safe enough with what the preprocessors could do.
         nbc =  copy.deepcopy(nb)
         resc = copy.deepcopy(resources)
 
         #Run each preprocessor on the notebook.  Carry the output along
         #to each preprocessor
         for preprocessor in self._preprocessors:
             nbc, resc = preprocessor(nbc, resc)
         return nbc, resc

IPython/nbconvert/exporters/templateexporter.py

@@ -1,322 +1,320 b''
 """This module defines TemplateExporter, a highly configurable converter
 that uses Jinja2 to export notebook files into different formats.
 """
 
 #-----------------------------------------------------------------------------
 # 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
 #-----------------------------------------------------------------------------
 
 from __future__ import print_function, absolute_import
 
 # Stdlib imports
 import os
 
 # other libs/dependencies are imported at runtime
 # to move ImportErrors to runtime when the requirement is actually needed
 
 # IPython imports
 from IPython.utils.traitlets import MetaHasTraits, Unicode, List, Dict, Any
 from IPython.utils.importstring import import_item
 from IPython.utils import py3compat, text
 
-from IPython.nbformat.current import docstring_nbformat_mod
 from IPython.nbconvert import filters
 from .exporter import Exporter
 
 #-----------------------------------------------------------------------------
 # Globals and constants
 #-----------------------------------------------------------------------------
 
 #Jinja2 extensions to load.
 JINJA_EXTENSIONS = ['jinja2.ext.loopcontrols']
 
 default_filters = {
         'indent': text.indent,
         'markdown2html': filters.markdown2html,
         'ansi2html': filters.ansi2html,
         'filter_data_type': filters.DataTypeFilter,
         'get_lines': filters.get_lines,
         'highlight2html': filters.Highlight2HTML,
         'highlight2latex': filters.Highlight2Latex,
         'ipython2python': filters.ipython2python,
         'posix_path': filters.posix_path,
         'markdown2latex': filters.markdown2latex,
         'markdown2rst': filters.markdown2rst,
         'comment_lines': filters.comment_lines,
         'strip_ansi': filters.strip_ansi,
         'strip_dollars': filters.strip_dollars,
         'strip_files_prefix': filters.strip_files_prefix,
         'html2text' : filters.html2text,
         'add_anchor': filters.add_anchor,
         'ansi2latex': filters.ansi2latex,
         'wrap_text': filters.wrap_text,
         'escape_latex': filters.escape_latex,
         'citation2latex': filters.citation2latex,
         'path2url': filters.path2url,
         'add_prompts': filters.add_prompts,
         'ascii_only': filters.ascii_only,
 }
 
 #-----------------------------------------------------------------------------
 # Class
 #-----------------------------------------------------------------------------
 
 class TemplateExporter(Exporter):
     """
     Exports notebooks into other file formats.  Uses Jinja 2 templating engine
     to output new formats.  Inherit from this class if you are creating a new
     template type along with new filters/preprocessors.  If the filters/
     preprocessors provided by default suffice, there is no need to inherit from
     this class.  Instead, override the template_file and file_extension
     traits via a config file.
 
     {filters}
     """
     
     # finish the docstring
     __doc__ = __doc__.format(filters = '- '+'\n    - '.join(default_filters.keys()))
 
 
     template_file = Unicode(u'default',
             config=True,
             help="Name of the template file to use")
     def _template_file_changed(self, name, old, new):
         if new == 'default':
             self.template_file = self.default_template
         else:
             self.template_file = new
         self.template = None
         self._load_template()
     
     default_template = Unicode(u'')
     template = Any()
     environment = Any()
 
     template_path = List(['.'], config=True)
     def _template_path_changed(self, name, old, new):
         self._load_template()
 
     default_template_path = Unicode(
         os.path.join("..", "templates"), 
         help="Path where the template files are located.")
 
     template_skeleton_path = Unicode(
         os.path.join("..", "templates", "skeleton"), 
         help="Path where the template skeleton files are located.") 
 
     #Jinja block definitions
     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(".tpl", config=True)
 
     filters = Dict(config=True,
         help="""Dictionary of filters, by name and namespace, to add to the Jinja
         environment.""")
 
     raw_mimetypes = List(config=True,
         help="""formats of raw cells to be included in this Exporter's output."""
     )
     def _raw_mimetypes_default(self):
         return [self.output_mimetype, '']
 
 
     def __init__(self, config=None, extra_loaders=None, **kw):
         """
         Public constructor
     
         Parameters
         ----------
         config : config
             User configuration instance.
         extra_loaders : list[of Jinja Loaders]
             ordered list of Jinja loader to find templates. Will be tried in order
             before the default FileSystem ones.
         template : str (optional, kw arg)
             Template to use when exporting.
         """
         super(TemplateExporter, self).__init__(config=config, **kw)
 
         #Init
         self._init_template()
         self._init_environment(extra_loaders=extra_loaders)
         self._init_filters()
 
 
     def _load_template(self):
         """Load the Jinja template object from the template file
         
         This is a no-op if the template attribute is already defined,
         or the Jinja environment is not setup yet.
         
         This is triggered by various trait changes that would change the template.
         """
         from jinja2 import TemplateNotFound
         
         if self.template is not None:
             return
         # called too early, do nothing
         if self.environment is None:
             return
         # Try different template names during conversion.  First try to load the
         # template by name with extension added, then try loading the template
         # as if the name is explicitly specified, then try the name as a 
         # 'flavor', and lastly just try to load the template by module name.
         try_names = []
         if self.template_file:
             try_names.extend([
                 self.template_file + self.template_extension,
                 self.template_file,
             ])
         for try_name in try_names:
             self.log.debug("Attempting to load template %s", try_name)
             try:
                 self.template = self.environment.get_template(try_name)
             except (TemplateNotFound, IOError):
                 pass
             except Exception as e:
                 self.log.warn("Unexpected exception loading template: %s", try_name, exc_info=True)
             else:
                 self.log.info("Loaded template %s", try_name)
                 break
 
-    @docstring_nbformat_mod
     def from_notebook_node(self, nb, resources=None, **kw):
         """
         Convert a notebook from a notebook node instance.
     
         Parameters
         ----------
-        nb : :class:`~{nbformat_mod}.nbbase.NotebookNode`
+        nb : :class:`~IPython.nbformat.current.NotebookNode`
           Notebook node
         resources : dict
           Additional resources that can be accessed read/write by
           preprocessors and filters.
         """
         nb_copy, resources = super(TemplateExporter, self).from_notebook_node(nb, resources, **kw)
         resources.setdefault('raw_mimetypes', self.raw_mimetypes)
 
         self._load_template()
 
         if self.template is not None:
             output = self.template.render(nb=nb_copy, resources=resources)
         else:
             raise IOError('template file "%s" could not be found' % self.template_file)
         return output, resources
 
 
     def register_filter(self, name, jinja_filter):
         """
         Register a filter.
         A filter is a function that accepts and acts on one string.  
         The filters are accesible within the Jinja templating engine.
     
         Parameters
         ----------
         name : str
             name to give the filter in the Jinja engine
         filter : filter
         """
         if jinja_filter is None:
             raise TypeError('filter')
         isclass = isinstance(jinja_filter, type)
         constructed = not isclass
 
         #Handle filter's registration based on it's type
         if constructed and isinstance(jinja_filter, py3compat.string_types):
             #filter is a string, import the namespace and recursively call
             #this register_filter method
             filter_cls = import_item(jinja_filter)
             return self.register_filter(name, filter_cls)
         
         if constructed and hasattr(jinja_filter, '__call__'):
             #filter is a function, no need to construct it.
             self.environment.filters[name] = jinja_filter
             return jinja_filter
 
         elif isclass and isinstance(jinja_filter, MetaHasTraits):
             #filter is configurable.  Make sure to pass in new default for 
             #the enabled flag if one was specified.
             filter_instance = jinja_filter(parent=self)
             self.register_filter(name, filter_instance )
 
         elif isclass:
             #filter is not configurable, construct it
             filter_instance = jinja_filter()
             self.register_filter(name, filter_instance)
 
         else:
             #filter is an instance of something without a __call__ 
             #attribute.  
             raise TypeError('filter')
 
         
     def _init_template(self):
         """
         Make sure a template name is specified.  If one isn't specified, try to
         build one from the information we know.
         """
         self._template_file_changed('template_file', self.template_file, self.template_file)
         
 
     def _init_environment(self, extra_loaders=None):
         """
         Create the Jinja templating environment.
         """
         from jinja2 import Environment, ChoiceLoader, FileSystemLoader
         here = os.path.dirname(os.path.realpath(__file__))
         loaders = []
         if extra_loaders:
             loaders.extend(extra_loaders)
 
         paths = self.template_path
         paths.extend([os.path.join(here, self.default_template_path),
                       os.path.join(here, self.template_skeleton_path)])
         loaders.append(FileSystemLoader(paths))
 
         self.environment = Environment(
             loader= ChoiceLoader(loaders),
             extensions=JINJA_EXTENSIONS
             )
         
         #Set special Jinja2 syntax that will not conflict with latex.
         if self.jinja_logic_block_start:
             self.environment.block_start_string = self.jinja_logic_block_start
         if self.jinja_logic_block_end:
             self.environment.block_end_string = self.jinja_logic_block_end
         if self.jinja_variable_block_start:
             self.environment.variable_start_string = self.jinja_variable_block_start
         if self.jinja_variable_block_end:
             self.environment.variable_end_string = self.jinja_variable_block_end
         if self.jinja_comment_block_start:
             self.environment.comment_start_string = self.jinja_comment_block_start
         if self.jinja_comment_block_end:
             self.environment.comment_end_string = self.jinja_comment_block_end
 
     
     def _init_filters(self):
         """
         Register all of the filters required for the exporter.
         """
         
         #Add default filters to the Jinja2 environment
         for key, value in default_filters.items():
             self.register_filter(key, value)
 
         #Load user filters.  Overwrite existing filters if need be.
         if self.filters:
             for key, user_filter in self.filters.items():
                 self.register_filter(key, user_filter)

IPython/nbformat/current.py

@@ -1,223 +1,212 b''
 """The official API for working with notebooks in the current format version."""
 
 from __future__ import print_function
 
-from xml.etree import ElementTree as ET
 import re
 
 from IPython.utils.py3compat import unicode_type
 
 from IPython.nbformat.v3 import (
     NotebookNode,
     new_code_cell, new_text_cell, new_notebook, new_output, new_worksheet,
     parse_filename, new_metadata, new_author, new_heading_cell, nbformat,
     nbformat_minor, nbformat_schema, to_notebook_json
 )
 from IPython.nbformat import v3 as _v_latest
 
 from .reader import reads as reader_reads
 from .reader import versions
 from .convert import convert
 from .validator import validate
 
 from IPython.utils.log import get_logger
 
 __all__ = ['NotebookNode', 'new_code_cell', 'new_text_cell', 'new_notebook',
 'new_output', 'new_worksheet', 'parse_filename', 'new_metadata', 'new_author',
 'new_heading_cell', 'nbformat', 'nbformat_minor', 'nbformat_schema',
 'to_notebook_json', 'convert', 'validate', 'NBFormatError', 'parse_py',
 'reads_json', 'writes_json', 'reads_py', 'writes_py', 'reads', 'writes', 'read',
 'write']
 
 current_nbformat = nbformat
 current_nbformat_minor = nbformat_minor
 current_nbformat_module = _v_latest.__name__
 
 
-def docstring_nbformat_mod(func):
-    """Decorator for docstrings referring to classes/functions accessed through
-    nbformat.current.
-
-    Put {nbformat_mod} in the docstring in place of 'IPython.nbformat.v3'.
-    """
-    func.__doc__ = func.__doc__.format(nbformat_mod=current_nbformat_module)
-    return func
-
-
 class NBFormatError(ValueError):
     pass
 
 
 def parse_py(s, **kwargs):
     """Parse a string into a (nbformat, string) tuple."""
     nbf = current_nbformat
     nbm = current_nbformat_minor
     
     pattern = r'# <nbformat>(?P<nbformat>\d+[\.\d+]*)</nbformat>'
     m = re.search(pattern,s)
     if m is not None:
         digits = m.group('nbformat').split('.')
         nbf = int(digits[0])
         if len(digits) > 1:
             nbm = int(digits[1])
 
     return nbf, nbm, s
 
 
 def reads_json(nbjson, **kwargs):
     """Read a JSON notebook from a string and return the NotebookNode
     object. Report if any JSON format errors are detected.
 
     """
     nb = reader_reads(nbjson, **kwargs)
     nb_current = convert(nb, current_nbformat)
     errors = validate(nb_current)
     if errors:
         get_logger().error(
             "Notebook JSON is invalid (%d errors detected during read)",
             len(errors))
     return nb_current
 
 
 def writes_json(nb, **kwargs):
     """Take a NotebookNode object and write out a JSON string. Report if
     any JSON format errors are detected.
 
     """
     errors = validate(nb)
     if errors:
         get_logger().error(
             "Notebook JSON is invalid (%d errors detected during write)",
             len(errors))
     nbjson = versions[current_nbformat].writes_json(nb, **kwargs)
     return nbjson
 
 
 def reads_py(s, **kwargs):
     """Read a .py notebook from a string and return the NotebookNode object."""
     nbf, nbm, s = parse_py(s, **kwargs)
     if nbf in (2, 3):
         nb = versions[nbf].to_notebook_py(s, **kwargs)
     else:
         raise NBFormatError('Unsupported PY nbformat version: %i' % nbf)
     return nb
 
 
 def writes_py(nb, **kwargs):
     # nbformat 3 is the latest format that supports py
     return versions[3].writes_py(nb, **kwargs)
 
 
 # High level API
 
 
 def reads(s, format, **kwargs):
     """Read a notebook from a string and return the NotebookNode object.
 
     This function properly handles notebooks of any version. The notebook
     returned will always be in the current version's format.
 
     Parameters
     ----------
     s : unicode
         The raw unicode string to read the notebook from.
     format : (u'json', u'ipynb', u'py')
         The format that the string is in.
 
     Returns
     -------
     nb : NotebookNode
         The notebook that was read.
     """
     format = unicode_type(format)
     if format == u'json' or format == u'ipynb':
         return reads_json(s, **kwargs)
     elif format == u'py':
         return reads_py(s, **kwargs)
     else:
         raise NBFormatError('Unsupported format: %s' % format)
 
 
 def writes(nb, format, **kwargs):
     """Write a notebook to a string in a given format in the current nbformat version.
 
     This function always writes the notebook in the current nbformat version.
 
     Parameters
     ----------
     nb : NotebookNode
         The notebook to write.
     format : (u'json', u'ipynb', u'py')
         The format to write the notebook in.
 
     Returns
     -------
     s : unicode
         The notebook string.
     """
     format = unicode_type(format)
     if format == u'json' or format == u'ipynb':
         return writes_json(nb, **kwargs)
     elif format == u'py':
         return writes_py(nb, **kwargs)
     else:
         raise NBFormatError('Unsupported format: %s' % format)
 
 
 def read(fp, format, **kwargs):
     """Read a notebook from a file and return the NotebookNode object.
 
     This function properly handles notebooks of any version. The notebook
     returned will always be in the current version's format.
 
     Parameters
     ----------
     fp : file
         Any file-like object with a read method.
     format : (u'json', u'ipynb', u'py')
         The format that the string is in.
 
     Returns
     -------
     nb : NotebookNode
         The notebook that was read.
     """
     return reads(fp.read(), format, **kwargs)
 
 
 def write(nb, fp, format, **kwargs):
     """Write a notebook to a file in a given format in the current nbformat version.
 
     This function always writes the notebook in the current nbformat version.
 
     Parameters
     ----------
     nb : NotebookNode
         The notebook to write.
     fp : file
         Any file-like object with a write method.
     format : (u'json', u'ipynb', u'py')
         The format to write the notebook in.
 
     Returns
     -------
     s : unicode
         The notebook string.
     """
     return fp.write(writes(nb, format, **kwargs))
 
 def _convert_to_metadata():
     """Convert to a notebook having notebook metadata."""
     import glob
     for fname in glob.glob('*.ipynb'):
         print('Converting file:',fname)
         with open(fname,'r') as f:
             nb = read(f,u'json')
         md = new_metadata()
         if u'name' in nb:
             md.name = nb.name
             del nb[u'name']            
         nb.metadata = md
         with open(fname,'w') as f:
             write(nb, f, u'json')