Marshmallow

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Features:

- Add ``valid_data`` attribute to ``ValidationError``.
- Add ``strict`` parameter to ``Integer`` (:issue:`667`). Thanks
:user:`yoichi`.

Deprecations/Removals:

- Deprecate ``json_module`` option in favor of ``render_module`` (:issue:`364`, :issue:`130`). Thanks :user:`justanr` for the suggestion.

Bug fixes:

- Includes bug fixes from releases 2.13.5 and 2.13.6.
- *Backwards-incompatible*: ``Number`` fields don't accept booleans as valid input (:issue:`623`). Thanks :user:`tuukkamustonen` for the suggestion and thanks :user:`rowillia` for the PR.

Support:

- Add benchmark script. Thanks :user:`rowillia`.

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Features:

- Add ``truthy`` and ``falsy`` params to ``fields.Boolean`` (:issue:`580`). Thanks :user:`zwack` for the PR. Note: This is potentially a breaking change if your code passes the `default` parameter positionally. Pass `default` as a keyword argument instead, e.g. ``fields.Boolean(default=True)``.

Other changes:

- *Backwards-incompatible*: ``validate.ContainsOnly`` allows empty and duplicate values (:issue:`516`, :issue:`603`). Thanks :user:`maximkulkin` for the suggestion and thanks :user:`lafrech` for the PR.

Bug fixes:

- Includes bug fixes from release 2.13.4.

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Features:

- ``fields.Nested`` respects ``only='field'`` when deserializing (:issue:`307`). Thanks :user:`erlingbo` for the suggestion and the PR.
- ``fields.Boolean`` parses ``"on"``/``"off"`` (:issue:`580`). Thanks :user:`marcellarius` for the suggestion.


Other changes:

- Includes changes from release 2.13.2.
- *Backwards-incompatible*: ``skip_on_field_errors`` defaults to ``True`` for ``validates_schema`` (:issue:`352`).

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Features:

- ``dump_only`` and ``load_only`` for ``Function`` and ``Method`` are set based on ``serialize`` and ``deserialize`` arguments (:issue:`328`).

Other changes:

- *Backwards-incompatible*: ``fields.Method`` and ``fields.Function`` no longer swallow ``AttributeErrors`` (:issue:`395`). Thanks :user:`bereal` for the suggestion.
- *Backwards-incompatible*: ``validators.Length`` is no longer a subclass of ``validators.Range`` (:issue:`458`). Thanks :user:`deckar01` for the catch and patch.
- *Backwards-incompatible*: ``utils.get_func_args`` no longer returns bound arguments. This is consistent with the behavior of ``inspect.signature``. This change prevents a DeprecationWarning on Python 3.5 (:issue:`415`, :issue:`479`). Thanks :user:`deckar01` for the PR.
- *Backwards-incompatible*: Change the signature of ``utils.get_value`` and ``Schema.get_attribute`` for consistency with Python builtins (e.g. ``getattr``) (:issue:`341`). Thanks :user:`stas` for reporting and thanks :user:`deckar01` for the PR.
- *Backwards-incompatible*: Don't unconditionally call callable attributes (:issue:`430`, reverts :issue:`242`). Thanks :user:`mirko` for the suggestion.
- Drop support for Python 2.6 and 3.3.

Deprecation/Removals:

- Remove ``__error_handler__``, ``__accessor__``, ``Schema.error_handler``, and ``Schema.accessor``. Override ``Schema.handle_error`` and ``Schema.get_attribute`` instead.
- Remove ``func`` parameter of ``fields.Function``. Remove ``method_name`` parameter of ``fields.Method`` (issue:`325`). Use the ``serialize`` parameter instead.
- Remove ``extra`` parameter from ``Schema``. Use a ``post_dump`` method to add additional data.

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Bug fixes:

- Don't match string-ending newlines in ``URL`` and ``Email`` fields
(:issue:`1522`). Thanks :user:`nbanmp` for the PR.

Other changes:

- Drop support for Python 3.4 (:pr:`1525`).

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Bug fixes:

- Fix behavior when a non-list collection is passed to the ``validate`` argument of ``fields.Email`` and ``fields.URL`` (:issue:`1400`).