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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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convert.py
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/ IPython / nbformat / v3 / convert.py
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"""Code for converting notebooks to and from the v2 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 (
new_code_cell, new_text_cell, new_worksheet, new_notebook, new_output,
nbformat, nbformat_minor
)
from IPython.nbformat import v2
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
def convert_to_this_nbformat(nb, orig_version=2, orig_minor=0):
"""Convert a notebook to the v3 format.
Parameters
----------
nb : NotebookNode
The Python representation of the notebook to convert.
orig_version : int
The original version of the notebook to convert.
orig_minor : int
The original minor version of the notebook to convert (only relevant for v >= 3).
"""
if orig_version == 1:
nb = v2.convert_to_this_nbformat(nb)
orig_version = 2
if orig_version == 2:
# Mark the original nbformat so consumers know it has been converted.
nb.nbformat = nbformat
nb.nbformat_minor = nbformat_minor
nb.orig_nbformat = 2
return nb
elif orig_version == 3:
if orig_minor != nbformat_minor:
nb.orig_nbformat_minor = orig_minor
nb.nbformat_minor = nbformat_minor
return nb
else:
raise ValueError('Cannot convert a notebook from v%s to v3' % orig_version)