执行jupyter nbconvert时的TypeError

Question

我在运行jupyter nbconvert时遇到问题。

它总是显示以下错误跟踪(即使是有几个普通单元格的笔记本)

Traceback (most recent call last):
  File "/home/miguel/.virtualenvs/ipython/bin/jupyter-nbconvert", line 11, in <module>
    sys.exit(main())
  File "/home/miguel/.virtualenvs/ipython/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 "/home/miguel/.virtualenvs/ipython/local/lib/python2.7/site-packages/traitlets/config/application.py", line 596, in launch_instance
    app.start()
  File "/home/miguel/.virtualenvs/ipython/local/lib/python2.7/site-packages/nbconvert/nbconvertapp.py", line 293, in start
    self.convert_notebooks()
  File "/home/miguel/.virtualenvs/ipython/local/lib/python2.7/site-packages/nbconvert/nbconvertapp.py", line 447, in convert_notebooks
    self.exporter = cls(config=self.config)
  File "/home/miguel/.virtualenvs/ipython/local/lib/python2.7/site-packages/nbconvert/exporters/templateexporter.py", line 151, in __init__
    super(TemplateExporter, self).__init__(config=config, **kw)
  File "/home/miguel/.virtualenvs/ipython/local/lib/python2.7/site-packages/nbconvert/exporters/exporter.py", line 101, in __init__
    self._init_preprocessors()
  File "/home/miguel/.virtualenvs/ipython/local/lib/python2.7/site-packages/nbconvert/exporters/exporter.py", line 250, in _init_preprocessors
    self.register_preprocessor(preprocessor, enabled=True)
  File "/home/miguel/.virtualenvs/ipython/local/lib/python2.7/site-packages/nbconvert/exporters/exporter.py", line 211, in register_preprocessor
    preprocessor_cls = import_item(preprocessor)
  File "/home/miguel/.virtualenvs/ipython/local/lib/python2.7/site-packages/ipython_genutils/importstring.py", line 31, in import_item
    module = __import__(package, fromlist=[obj])
TypeError: Item in ``from list'' not a string

这可能与我最近安装的to扩展有关，因为几天前jupyter nbconvert命令还可以很好地工作。

今天，我在安装nbextensions时遇到了一些问题。我试过使用conda，但当我按照here的说明操作时，它终于起作用了。

Answer 1

今天我也遇到了同样的问题。正如here文档所示，这似乎是nbconvert中的一个错误。解决方案是编辑您的"jupyter_nbconvert_config.json“文件。对我来说，默认情况下，它位于我的主目录中: /home/me/.jupyter/jupyter_nbconvert_config.json

在那里，我更改了预处理器字符串，在它们前面添加了一个"r“：

{
  "Exporter": {
    "template_path": [
      ".", 
      "/usr/lib/python2.7/site-    packages/jupyter_contrib_nbextensions/templates"
    ], 
    "preprocessors": [
      r"jupyter_contrib_nbextensions.nbconvert_support.CodeFoldingPreprocessor", 
      r"jupyter_contrib_nbextensions.nbconvert_support.PyMarkdownPreprocessor"
    ]
  }, 
  "NbConvertApp": {
    "postprocessor_class":     "jupyter_contrib_nbextensions.nbconvert_support.EmbedPostProcessor"
  }, 
  "version": 1
}

Answer 2

找到解决方案here。基本上，您需要删除或重命名jupyter_nbconvert_config文件。

Answer 3

此错误最近已修复，请参阅详细信息here。运行ipython的完整更新，或手动修复：

更改ipython_/中的第31行

module = __import__(package, fromlist=[obj])     

至

module = __import__(package, fromlist=[str(obj)])