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Backport PR #4163: Fix for incorrect default encoding on Windows....
Backport PR #4163: Fix for incorrect default encoding on Windows. Whilst trying out rendering notebooks in a flask app under Apache on Windows I got the below error when simply trying to import `SlidesExporter` ```python mod_wsgi (pid=6260): Exception occurred processing WSGI script 'flask_test.wsgi'. Traceback (most recent call last): File "flask_test.py", line 81, in render_notebook from IPython.nbconvert.exporters import SlidesExporter File "c:\\dev\\code\\ipython\\IPython\\__init__.py", line 47, in <module> from .terminal.embed import embed File "c:\\dev\\code\\ipython\\IPython\\terminal\\embed.py", line 32, in <module> from IPython.terminal.interactiveshell import TerminalInteractiveShell File "c:\\dev\\code\\ipython\\IPython\\terminal\\interactiveshell.py", line 25, in <module> from IPython.core.interactiveshell import InteractiveShell, InteractiveShellABC File "c:\\dev\\code\\ipython\\IPython\\core\\interactiveshell.py", line 59, in <module> from IPython.core.prompts import PromptManager File "c:\\dev\\code\\ipython\\IPython\\core\\prompts.py", line 138, in <module> HOME = py3compat.str_to_unicode(os.environ.get("HOME","//////:::::ZZZZZ,,,~~~")) File "c:\\dev\\code\\ipython\\IPython\\utils\\py3compat.py", line 18, in decode return s.decode(encoding, "replace") LookupError: unknown encoding: cp0 ``` A little bit of [googling](http://bugs.python.org/issue6501) suggests that Windows returns 'cp0' to indicate there is no code page. This fix simply looks for this invalid value and replaces it with something valid. With this change it works for me.

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__init__.py
74 lines | 2.4 KiB | text/x-python | PythonLexer
"""The main API for the v3 notebook format.
Authors:
* Brian Granger
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2008-2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
from .nbbase import (
NotebookNode,
new_code_cell, new_text_cell, new_notebook, new_output, new_worksheet,
new_metadata, new_author, new_heading_cell, nbformat, nbformat_minor
)
from .nbjson import reads as reads_json, writes as writes_json
from .nbjson import reads as read_json, writes as write_json
from .nbjson import to_notebook as to_notebook_json
from .nbpy import reads as reads_py, writes as writes_py
from .nbpy import reads as read_py, writes as write_py
from .nbpy import to_notebook as to_notebook_py
from .convert import convert_to_this_nbformat
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
def parse_filename(fname):
"""Parse a notebook filename.
This function takes a notebook filename and returns the notebook
format (json/py) and the notebook name. This logic can be
summarized as follows:
* notebook.ipynb -> (notebook.ipynb, notebook, json)
* notebook.json -> (notebook.json, notebook, json)
* notebook.py -> (notebook.py, notebook, py)
* notebook -> (notebook.ipynb, notebook, json)
Parameters
----------
fname : unicode
The notebook filename. The filename can use a specific filename
extention (.ipynb, .json, .py) or none, in which case .ipynb will
be assumed.
Returns
-------
(fname, name, format) : (unicode, unicode, unicode)
The filename, notebook name and format.
"""
if fname.endswith(u'.ipynb'):
format = u'json'
elif fname.endswith(u'.json'):
format = u'json'
elif fname.endswith(u'.py'):
format = u'py'
else:
fname = fname + u'.ipynb'
format = u'json'
name = fname.split('.')[0]
return fname, name, format