Converting some NotebookNodes to HTML throws errors about nbconvert HOT 2 CLOSED

Indented for readability.

{'cells': [{'cell_type': 'code',
   'execution_count': None,
   'metadata': {'collapsed': True},
   'outputs': [],
   'source': []}],
 'metadata': {'kernelspec': {'display_name': 'Python 3',
   'language': 'python',
   'name': 'python3'},
  'language_info': {'codemirror_mode': {'name': 'ipython', 'version': 3},
   'file_extension': '.py',
   'mimetype': 'text/x-python',
   'name': 'python',
   'nbconvert_exporter': 'python',
   'pygments_lexer': 'ipython3',
   'version': '3.4.2'}},
 'nbformat': 4,
 'nbformat_minor': 0}

So one of the issues (at least for nnode2) is that in-memory cells[x].source is supposed to be a string, and not a list of string. Which get through the validation process as we have only 1 schema for disk and in-memory (for historical reasons)

We should probably make these distinction and methods more accurate/documented/robust.

from nbconvert.

If you have the raw JSON in-memory, you need to convert it to the in-memory format:

from nbformat.v4 import to_notebook
nb = to_notebook(nb_dict)

If you got the JSON string somehow (it presumably came from somewhere), you can get a notebook with nbformat.reads(json_string) instead of json.loads(json_string)

from nbconvert.