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# Module: `nbformat.v3.rwbase`

Base classes and utilities for readers and writers.

Authors:

- Brian Granger

## 2 Classes

class `IPython.nbformat.v3.rwbase.``NotebookReader`

  Bases: `object`

  A class for reading notebooks.

  `read`(fp, **kwargs)

    Read a notebook from a file like object

  `reads`(s, **kwargs)

    Read a notebook from a string.

class `IPython.nbformat.v3.rwbase.``NotebookWriter`

  Bases: `object`

  A class for writing notebooks.

  `write`(nb, fp, **kwargs)

    Write a notebook to a file like object

  `writes`(nb, **kwargs)

    Write a notebook to a string.

## 5 Functions

`IPython.nbformat.v3.rwbase.``restore_bytes`(nb)

  Restore bytes of image data from unicode-only formats.

  Base64 encoding is handled elsewhere. Bytes objects in the notebook are always b64-encoded. We DO NOT encode/decode around file formats.

  Note: this is never used

`IPython.nbformat.v3.rwbase.``rejoin_lines`(nb)

  rejoin multiline text into strings

  For reversing effects of `split_lines(nb)`.

  This only rejoins lines that have been split, so if text objects were not split they will pass through unchanged.

  Used when reading JSON files that may have been passed through split_lines.

`IPython.nbformat.v3.rwbase.``split_lines`(nb)

  split likely multiline text into lists of strings

  For file output more friendly to line-based VCS. `rejoin_lines(nb)` will reverse the effects of `split_lines(nb)`.

  Used when writing JSON files.

`IPython.nbformat.v3.rwbase.``base64_decode`(nb)

  Restore all bytes objects in the notebook from base64-encoded strings.

  Note: This is never used

`IPython.nbformat.v3.rwbase.``base64_encode`(nb)

  Base64 encode all bytes objects in the notebook.

  These will be b64-encoded unicode strings

  Note: This is never used

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