[IPython-dev] status of nbconvert

[Matthias BUSSONNIER]

There is definitively a mistune api change, 
we check dependency in setup.py :

https://github.com/ipython/ipython/blob/50799e6943174cbd24998c4fb018eff42aac5cfb/setup.py#L257

'mistune>=0.5'

But we definitively don't check at runtime. 
So the bug should be encounters only by people having installed
master some time ago and just pulling new versions.

Normal install should not suffer of this. 

You are right about the 500 though.

-- 
M



Le 19 janv. 2015 à 12:26, Zoltán Vörös a écrit :

> Hi all,
> 
> I have recently had problems with nbconvert, and I was wondering, 
> whether I do something improper, or the code is really broken. I have 
> pulled the latest from master, and nbconvert fails outright with a 
> simple notebook. (This eventually leads to a 500 server error, whenever 
> I try to download a notebook.)
> 
> Here is my traceback:
> 
> ipython nbconvert test.ipynb
> Traceback (most recent call last):
>   File "/usr/local/bin/ipython", line 5, in <module>
>     start_ipython()
>   File "/usr/local/lib/python2.7/dist-packages/IPython/__init__.py", 
> line 120, in start_ipython
>     return launch_new_instance(argv=argv, **kwargs)
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", 
> line 573, in launch_instance
>     app.initialize(argv)
>   File "<string>", line 2, in initialize
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", 
> line 75, in catch_config_error
>     return method(app, *args, **kwargs)
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 
> 321, in initialize
>     super(TerminalIPythonApp, self).initialize(argv)
>   File "<string>", line 2, in initialize
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", 
> line 75, in catch_config_error
>     return method(app, *args, **kwargs)
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/core/application.py", 
> line 369, in initialize
>     self.parse_command_line(argv)
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 
> 316, in parse_command_line
>     return super(TerminalIPythonApp, self).parse_command_line(argv)
>   File "<string>", line 2, in parse_command_line
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", 
> line 75, in catch_config_error
>     return method(app, *args, **kwargs)
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", 
> line 471, in parse_command_line
>     return self.initialize_subcommand(subc, subargv)
>   File "<string>", line 2, in initialize_subcommand
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", 
> line 75, in catch_config_error
>     return method(app, *args, **kwargs)
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", 
> line 402, in initialize_subcommand
>     subapp = import_item(subapp)
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/utils/importstring.py", 
> line 42, in import_item
>     module = __import__(package, fromlist=[obj])
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/nbconvert/__init__.py", 
> line 3, in <module>
>     from .exporters import *
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/nbconvert/exporters/__init__.py", 
> line 1, in <module>
>     from .export import *
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/nbconvert/exporters/export.py", 
> line 13, in <module>
>     from .templateexporter import TemplateExporter
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/nbconvert/exporters/templateexporter.py", 
> line 30, in <module>
>     from IPython.nbconvert import filters
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/nbconvert/filters/__init__.py", 
> line 6, in <module>
>     from .markdown import *
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/nbconvert/filters/markdown.py", 
> line 79, in <module>
>     class MathBlockLexer(mistune.BlockLexer):
>   File 
> "/usr/local/lib/python2.7/dist-packages/IPython/nbconvert/filters/markdown.py", 
> line 80, in MathBlockLexer
>     default_rules = ['block_math', 'latex_environment'] + 
> mistune.BlockLexer.default_rules
> AttributeError: type object 'BlockLexer' has no attribute 'default_rules'
> 
> 
> 
> If, in markdown.py, I remove
> 
> + mistune.BlockLexer.default_rules on line 80, and
> + mistune.InlineLexer.default_rules on line 108, then everything seems 
> to work fine.
> 
> Could it be that the mistune version that I have (0.4) doesn't have the 
> default_rules property, but the version with which ipython was tested on 
> travis has? If so, shouldn't nbconvert bail out when the version 
> requirement is not fulfilled, or shouldn't simply the default_rules 
> property be defined, when the class is inherited in markdown.py? If this 
> is the case, I could file a fix on github.
> 
> Somewhat related: if there is a server error, wouldn't it be more 
> meaningful to return the traceback, instead of "500: internal server error"?
> 
> Cheers,
> Zoltán
> 
> 
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