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nbconvert export fails for HTML & PDF on macOS with Python-Homebrew-Installation #1773

@guger

Description

@guger

Description
I want to export a pdf of my jupyter notebook (.ipynb) file, but this doesn't work, as it can't resolve the template_path.

Stacktrace:

jupyter nbconvert --to html SymMeasNodeNet.ipynb
Traceback (most recent call last):
  File "/opt/homebrew/lib/python3.9/site-packages/traitlets/traitlets.py", line 537, in get
    value = obj._trait_values[self.name]
KeyError: 'template_paths'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/homebrew/bin/jupyter-nbconvert", line 8, in <module>
    sys.exit(main())
  File "/opt/homebrew/lib/python3.9/site-packages/jupyter_core/application.py", line 269, in launch_instance
    return super().launch_instance(argv=argv, **kwargs)
  File "/opt/homebrew/lib/python3.9/site-packages/traitlets/config/application.py", line 846, in launch_instance
    app.start()
  File "/opt/homebrew/lib/python3.9/site-packages/nbconvert/nbconvertapp.py", line 414, in start
    self.convert_notebooks()
  File "/opt/homebrew/lib/python3.9/site-packages/nbconvert/nbconvertapp.py", line 582, in convert_notebooks
    cls = get_exporter(self.export_format)
  File "/opt/homebrew/lib/python3.9/site-packages/nbconvert/exporters/base.py", line 101, in get_exporter
    if getattr(exporter(config=config), "enabled", True):
  File "/opt/homebrew/lib/python3.9/site-packages/nbconvert/exporters/templateexporter.py", line 341, in __init__
    super().__init__(config=config, **kw)
  File "/opt/homebrew/lib/python3.9/site-packages/nbconvert/exporters/exporter.py", line 117, in __init__
    self._init_preprocessors()
  File "/opt/homebrew/lib/python3.9/site-packages/nbconvert/exporters/templateexporter.py", line 507, in _init_preprocessors
    conf = self._get_conf()
  File "/opt/homebrew/lib/python3.9/site-packages/nbconvert/exporters/templateexporter.py", line 525, in _get_conf
    for path in map(Path, self.template_paths):
  File "/opt/homebrew/lib/python3.9/site-packages/traitlets/traitlets.py", line 577, in __get__
    return self.get(obj, cls)
  File "/opt/homebrew/lib/python3.9/site-packages/traitlets/traitlets.py", line 540, in get
    default = obj.trait_defaults(self.name)
  File "/opt/homebrew/lib/python3.9/site-packages/traitlets/traitlets.py", line 1580, in trait_defaults
    return self._get_trait_default_generator(names[0])(self)
  File "/opt/homebrew/lib/python3.9/site-packages/traitlets/traitlets.py", line 977, in __call__
    return self.func(*args, **kwargs)
  File "/opt/homebrew/lib/python3.9/site-packages/nbconvert/exporters/templateexporter.py", line 536, in _template_paths
    template_names = self.get_template_names()
  File "/opt/homebrew/lib/python3.9/site-packages/nbconvert/exporters/templateexporter.py", line 620, in get_template_names
    raise ValueError(
ValueError: No template sub-directory with name 'lab' found in the following paths:
	/Users/dguger/Library/Jupyter
	/Users/dguger/Library/Python/3.9/share/jupyter
	/opt/homebrew/opt/python@3.9/Frameworks/Python.framework/Versions/3.9/share/jupyter
	/usr/local/share/jupyter
	/usr/share/jupyter

Can you list steps to reproduce this issue?

Try to export a file using nbconvert on macOS.

Environment Data:

  • OS: macOS Monterey 12.3.1
  • Python version: 3.9.12
  • Jupyter server running: Local
  • LaTeX version: MacTex Version 3.141592653 (TeX Live 2021)
  • nbconvert: 6.5.0
  • jupyter: 1.0.0
  • jupyter-core: 4.10.0

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