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208 lines
6.0 KiB
208 lines
6.0 KiB
"""The Jupyter notebook format
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Use this module to read or write notebook files as particular nbformat versions.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from traitlets.log import get_logger
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from . import v1, v2, v3, v4
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from ._version import __version__, version_info
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from .sentinel import Sentinel
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__all__ = [
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"versions",
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"validate",
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"ValidationError",
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"convert",
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"from_dict",
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"NotebookNode",
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"current_nbformat",
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"current_nbformat_minor",
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"NBFormatError",
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"NO_CONVERT",
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"reads",
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"read",
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"writes",
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"write",
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"version_info",
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"__version__",
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]
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versions = {
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1: v1,
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2: v2,
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3: v3,
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4: v4,
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}
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from . import reader
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from .converter import convert
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from .notebooknode import NotebookNode, from_dict
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from .v4 import nbformat as current_nbformat
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from .v4 import nbformat_minor as current_nbformat_minor
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from .validator import ValidationError, validate
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class NBFormatError(ValueError):
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pass
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# no-conversion singleton
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NO_CONVERT = Sentinel(
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"NO_CONVERT",
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__name__,
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"""Value to prevent nbformat to convert notebooks to most recent version.
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""",
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)
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def reads(s, as_version, capture_validation_error=None, **kwargs):
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"""Read a notebook from a string and return the NotebookNode object as the given version.
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The string can contain a notebook of any version.
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The notebook will be returned `as_version`, converting, if necessary.
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Notebook format errors will be logged.
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Parameters
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----------
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s : unicode
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The raw unicode string to read the notebook from.
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as_version : int
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The version of the notebook format to return.
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The notebook will be converted, if necessary.
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Pass nbformat.NO_CONVERT to prevent conversion.
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capture_validation_error : dict, optional
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If provided, a key of "ValidationError" with a
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value of the ValidationError instance will be added
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to the dictionary.
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Returns
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-------
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nb : NotebookNode
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The notebook that was read.
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"""
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nb = reader.reads(s, **kwargs)
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if as_version is not NO_CONVERT:
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nb = convert(nb, as_version)
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try:
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validate(nb)
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except ValidationError as e:
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get_logger().error("Notebook JSON is invalid: %s", e)
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if isinstance(capture_validation_error, dict):
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capture_validation_error["ValidationError"] = e
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return nb
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def writes(nb, version=NO_CONVERT, capture_validation_error=None, **kwargs):
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"""Write a notebook to a string in a given format in the given nbformat version.
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Any notebook format errors will be logged.
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Parameters
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----------
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nb : NotebookNode
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The notebook to write.
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version : int, optional
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The nbformat version to write.
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If unspecified, or specified as nbformat.NO_CONVERT,
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the notebook's own version will be used and no conversion performed.
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capture_validation_error : dict, optional
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If provided, a key of "ValidationError" with a
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value of the ValidationError instance will be added
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to the dictionary.
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Returns
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-------
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s : unicode
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The notebook as a JSON string.
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"""
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if version is not NO_CONVERT:
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nb = convert(nb, version)
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else:
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version, _ = reader.get_version(nb)
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try:
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validate(nb)
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except ValidationError as e:
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get_logger().error("Notebook JSON is invalid: %s", e)
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if isinstance(capture_validation_error, dict):
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capture_validation_error["ValidationError"] = e
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return versions[version].writes_json(nb, **kwargs)
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def read(fp, as_version, capture_validation_error=None, **kwargs):
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"""Read a notebook from a file as a NotebookNode of the given version.
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The string can contain a notebook of any version.
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The notebook will be returned `as_version`, converting, if necessary.
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Notebook format errors will be logged.
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Parameters
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----------
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fp : file or str
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A file-like object with a read method that returns unicode (use
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``io.open()`` in Python 2), or a path to a file.
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as_version: int
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The version of the notebook format to return.
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The notebook will be converted, if necessary.
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Pass nbformat.NO_CONVERT to prevent conversion.
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capture_validation_error : dict, optional
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If provided, a key of "ValidationError" with a
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value of the ValidationError instance will be added
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to the dictionary.
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Returns
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-------
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nb : NotebookNode
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The notebook that was read.
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"""
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try:
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buf = fp.read()
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except AttributeError:
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with open(fp, encoding="utf-8") as f:
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return reads(f.read(), as_version, capture_validation_error, **kwargs)
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return reads(buf, as_version, capture_validation_error, **kwargs)
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def write(nb, fp, version=NO_CONVERT, capture_validation_error=None, **kwargs):
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"""Write a notebook to a file in a given nbformat version.
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The file-like object must accept unicode input.
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Parameters
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----------
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nb : NotebookNode
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The notebook to write.
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fp : file or str
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Any file-like object with a write method that accepts unicode, or
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a path to write a file.
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version : int, optional
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The nbformat version to write.
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If nb is not this version, it will be converted.
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If unspecified, or specified as nbformat.NO_CONVERT,
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the notebook's own version will be used and no conversion performed.
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capture_validation_error : dict, optional
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If provided, a key of "ValidationError" with a
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value of the ValidationError instance will be added
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to the dictionary.
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"""
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s = writes(nb, version, capture_validation_error, **kwargs)
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if isinstance(s, bytes):
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s = s.decode("utf8")
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try:
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fp.write(s)
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if not s.endswith("\n"):
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fp.write("\n")
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except AttributeError:
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with open(fp, "w", encoding="utf-8") as f:
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f.write(s)
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if not s.endswith("\n"):
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f.write("\n")
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