Nbconvert: test failure on master

[amueller]

I currently get the following test failures. What am I doing wrong?

Thanks!

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ERROR: Can a notebook be exported by filename?
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Traceback (most recent call last):
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/exporter_locator.py", line 84, in export_by_name
    Exporter = get_exporter(format_name)
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/base.py", line 110, in get_exporter
    % (name, ', '.join(get_export_names())))
ValueError: Unknown exporter "python", did you mean one of: ?

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/tests/test_export.py", line 38, in test_export_filename
    (output, resources) = export_by_name('python', self._get_notebook())
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/exporter_locator.py", line 87, in export_by_name
    raise ExporterNameError("Exporter for `%s` not found" % format_name)
nbconvert.exporters.base.ExporterNameError: Exporter for `python` not found

======================================================================
ERROR: Can a notebook be exported by a filesteam?
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Traceback (most recent call last):
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/exporter_locator.py", line 84, in export_by_name
    Exporter = get_exporter(format_name)
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/base.py", line 110, in get_exporter
    % (name, ', '.join(get_export_names())))
ValueError: Unknown exporter "python", did you mean one of: ?

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/tests/test_export.py", line 57, in test_export_filestream
    (output, resources) = export_by_name('python', f)
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/exporter_locator.py", line 87, in export_by_name
    raise ExporterNameError("Exporter for `%s` not found" % format_name)
nbconvert.exporters.base.ExporterNameError: Exporter for `python` not found

======================================================================
ERROR: Can a notebook be exported by a notebook node handle?
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Traceback (most recent call last):
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/exporter_locator.py", line 84, in export_by_name
    Exporter = get_exporter(format_name)
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/base.py", line 110, in get_exporter
    % (name, ', '.join(get_export_names())))
ValueError: Unknown exporter "python", did you mean one of: ?

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/tests/test_export.py", line 48, in test_export_nbnode
    (output, resources) = export_by_name('python', notebook)
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/exporter_locator.py", line 87, in export_by_name
    raise ExporterNameError("Exporter for `%s` not found" % format_name)
nbconvert.exporters.base.ExporterNameError: Exporter for `python` not found

======================================================================
ERROR: delegate to custom exporter from language_info
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Traceback (most recent call last):
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/tests/test_script.py", line 42, in test_export_python
    (output, resources) = self.exporter_class().from_notebook_node(pynb)
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/script.py", line 29, in from_notebook_node
    Exporter = get_exporter(exporter_name)
  File "/home/andy/checkout/nbconvert/nbconvert/exporters/base.py", line 110, in get_exporter
    % (name, ', '.join(get_export_names())))
ValueError: Unknown exporter "python", did you mean one of: ?
-------------------- >> begin captured logging << --------------------
root: DEBUG: Applying preprocessor: coalesce_streams
root: DEBUG: Attempting to load template script.tpl
root: DEBUG:     template_path: .
root: DEBUG: Loaded template /home/andy/checkout/nbconvert/nbconvert/exporters/../templates/script.tpl
root: DEBUG: Loading script exporter: python
--------------------- >> end captured logging << ---------------------

======================================================================
ERROR: --template '/path/to/template.tpl'
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Traceback (most recent call last):
  File "/home/andy/checkout/nbconvert/nbconvert/tests/test_nbconvertapp.py", line 100, in test_absolute_template_file
    self.nbconvert('--log-level 0 notebook2 --template %s' % template)
  File "/home/andy/checkout/nbconvert/nbconvert/tests/base.py", line 151, in nbconvert
    raise OSError(bytes_to_str(stderr))
OSError: Traceback (most recent call last):
  File "/home/andy/anaconda3/lib/python3.5/runpy.py", line 184, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/andy/anaconda3/lib/python3.5/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/__main__.py", line 2, in <module>
    main()
  File "/home/andy/anaconda3/lib/python3.5/site-packages/jupyter_core/application.py", line 267, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/home/andy/anaconda3/lib/python3.5/site-packages/traitlets/config/application.py", line 596, in launch_instance
    app.start()
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/nbconvertapp.py", line 293, in start
    self.convert_notebooks()
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/nbconvertapp.py", line 457, in convert_notebooks
    self.convert_single_notebook(notebook_filename)
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/nbconvertapp.py", line 428, in convert_single_notebook
    output, resources = self.export_single_notebook(notebook_filename, resources, input_buffer=input_buffer)
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/nbconvertapp.py", line 357, in export_single_notebook
    output, resources = self.exporter.from_filename(notebook_filename, resources=resources)
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/exporters/exporter.py", line 165, in from_filename
    return self.from_file(f, resources=resources, **kw)
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/exporters/exporter.py", line 183, in from_file
    return self.from_notebook_node(nbformat.read(file_stream, as_version=4), resources=resources, **kw)
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/exporters/html.py", line 65, in from_notebook_node
    return super(HTMLExporter, self).from_notebook_node(nb, resources, **kw)
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/exporters/templateexporter.py", line 203, in from_notebook_node
    output = self.template.render(nb=nb_copy, resources=resources)
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/exporters/templateexporter.py", line 80, in template
    self._template_cached = self._load_template()
  File "/home/andy/anaconda3/lib/python3.5/site-packages/nbconvert/exporters/templateexporter.py", line 186, in _load_template
    raise TemplateNotFound(self.template_file)
jinja2.exceptions.TemplateNotFound: /tmp/tmpkz6q352j/mytemplate.tpl


======================================================================
ERROR: Check if figure files are copied to configured path.
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Traceback (most recent call last):
  File "/home/andy/checkout/nbconvert/nbconvert/tests/test_nbconvertapp.py", line 435, in test_write_figures_to_custom_path
    assert fig_exists(path)
  File "/home/andy/checkout/nbconvert/nbconvert/tests/test_nbconvertapp.py", line 424, in fig_exists
    return (len(os.listdir(path)) > 0)
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/tmprzm9atnz/files'

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[mpacer]

This is confusing me, in what context are you running into these errors? When I run py.test on master I do not run into this and when I check travisCI these don't seem to arise

[mpacer]

What I'm thinking this might be related to is that for some reason your installation isn't finding the entrypoints for declaring exporters in the get_exporter_names(), and it was only working before because they were hard coded and the hard coded versions were removed from that call in a recent update.

[amueller]

Hm never mind. I did pip install -e . again and now it works. Sorry for the noise.

[mpacer]

no worries!

[takluyver]

@michaelpacer the downside of relying on entry points is that if the entry points themselves change in any way, people with a development install need to set it up again to get that change. I ran into this as well shortly after the change.

[demidovakatya]

Hi there, I have the same problem:

Traceback (most recent call last): File "/usr/local/bin/jupyter-nbconvert", line 11, in <module> sys.exit(main()) File "/usr/local/lib/python2.7/site-packages/jupyter_core/application.py", line 267, in launch_instance return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs) File "/usr/local/lib/python2.7/site-packages/traitlets/config/application.py", line 658, in launch_instance app.start() File "/usr/local/lib/python2.7/site-packages/nbconvert/nbconvertapp.py", line 305, in start self.convert_notebooks() File "/usr/local/lib/python2.7/site-packages/nbconvert/nbconvertapp.py", line 462, in convert_notebooks cls = get_exporter(self.export_format) File "/usr/local/lib/python2.7/site-packages/nbconvert/exporters/base.py", line 110, in get_exporter % (name, ', '.join(get_export_names()))) ValueError: Unknown exporter "html", did you mean one of: ?

(nbconvert (5.0.0), Python 2.7.13)

[mpacer]

Did you try a fresh installation?

It looks like get_export_names() isn't returning anything for you, it relies on entrypoints specifically via entrypoints.get_group_named('nbconvert.exporters') (see here) which makes me think that your entrypoints aren't updated. It may require reinstalling to reset these as @takluyver states here.

[demidovakatya]

@michaelpacer hmm, I've just pip install -U'd nbconvert, but nothung changed.

Do you mean installation via pip install -e?

[mpacer]

No I mean, uninstall and reinstall (pip uninstall nbconvert; pip install nbconvert).

Does it work then?

[demidovakatya]

@michaelpacer yes! thank you a lot!

[mpacer]

Huzzah! Glad to help; it always feels good to end the night on a positive note :)!

[mpacer]

@takluyver Why does an upgrade not work to reset the entrypoints, when the entrypoints have changed between versions (which presumably is what caused the breakage in the first place)?

[takluyver]

If pip install -U decides that you already have an up-to-date version of the thing you're trying to install, it doesn't install it again. Sometimes it seems to decide this when it's not accurate, especially if you've installed from a source checkout rather than a package. I'm not 100% sure why it would have in this case, but any time problems with package installation are suspected, uninstalling and installing again is a good idea.