Update marshmallow to 3.20.1

[pyup-bot]

This PR updates marshmallow from 2.19.5 to 3.20.1.

Changelog

3.20.1

*******************

Bug fixes:

- Fix call to ``get_declared_fields``: pass ``dict_cls`` again (:issue:`2152`).
Thanks :user:`Cheaterman` for reporting.

3.20.0

*******************

Features:

- Add ``absolute`` parameter to ``URL`` validator and ``Url`` field (:pr:`2123`).
Thanks :user:`sirosen` for the PR.
- Use Abstract Base Classes to define ``FieldABC`` and ``SchemaABC``
(:issue:`1449`). Thanks :user:`aditkumar72` for the PR.
- Use `OrderedSet` as default `set_class`. Schemas are now ordered by default.
(:issue:`1744`)

Bug fixes:

- Handle ``OSError`` and ``OverflowError`` in ``utils.from_timestamp`` (:pr:`2102`).
Thanks :user:`TheBigRoomXXL` for the PR.
- Fix the default inheritance of nested partial schemas (:issue:`2149`).
Thanks :user:`matejsp` for reporting.

Other changes:

- Officially support Python 3.11 (:pr:`2067`).
- Drop support for Python 3.7 (:pr:`2135`).

3.19.0

*******************

Features:

- Add ``timestamp`` and ``timestamp_ms`` formats to ``fields.DateTime``
(:issue:`612`).
Thanks :user:`vgavro` for the suggestion and thanks :user:`vanHoi` for
the PR.

3.18.0

*******************

Features:

- Add ``Enum`` field (:pr:`2017`) and (:pr:`2044`).

Bug fixes:

- Fix typing in ``Field._serialize`` signature (:pr:`2046`).

3.17.1

*******************

Bug fixes:

- Add return type to ``fields.Email.__init__`` (:pr:`2018`).
Thanks :user:`kkirsche` for the PR.
- Add missing type hint to IPInterface __init__ (:pr:`2036`).

3.17.0

*******************

Features:

- Support serialization as float in ``TimeDelta`` field (:pr:`1998`).
Thanks :user:`marcosatti` for the PR.
- Add ``messages_dict`` property to ``ValidationError`` to facilitate type checking
(:pr:`1976`).
Thanks :user:`sirosen` for the PR.

3.16.0

*******************

Features:

- Raise ``ValueError`` if an invalid value is passed to the ``unknown``
argument (:issue:`1721`, :issue:`1732`).
Thanks :user:`sirosen` for the PR.

Other changes:

- Set lower bound for ``packaging`` requirement (:issue:`1957`).
Thanks :user:`MatthewNicolTR` for reporting and thanks :user:`sirosen` for the PR.
- Improve warning messages by passing ``stacklevel`` (:pr:`1986`).
Thanks :user:`tirkarthi` for the PR.

3.15.0

*******************

Features:

- Allow passing a ``dict`` to ``fields.Nested`` (:pr:`1935`).
Thanks :user:`sirosen` for the PR.

Other changes:

- Address distutils deprecation warning in Python 3.10 (:pr:`1903`).
Thanks :user:`kkirsche` for the PR.
- Add py310 to black target-version (:pr:`1921`).
- Drop support for Python 3.6 (:pr:`1923`).
- Use postponed evaluation of annotations (:pr:`1932`).
Thanks :user:`Isira-Seneviratne` for the PR.

3.14.1

*******************

Bug fixes:

- Fix publishing type hints per `PEP-561 <https://www.python.org/dev/peps/pep-0561/>`_
(:pr:`1905`). Thanks :user:`bwindsor` for the catch and patch.

3.14.0

*******************

Bug fixes:

- Fix ``fields.TimeDelta`` serialization precision (:issue:`1865`).
Thanks :user:`yarsanich` for reporting.

Other changes:

- Fix type-hints for ``data`` arg in ``Schema.validate`` to accept
list of dictionaries (:issue:`1790`, :pr:`1868`).
Thanks  :user:`yourun-proger` for PR.
- Improve warning when passing metadata as keyword arguments (:pr:`1882`).
Thanks :user:`traherom` for the PR.
- Don't build universal wheels. We don't support Python 2 anymore.
(:issue:`1860`) Thanks :user:`YKdvd` for reporting.
- Make the build reproducible (:pr:`1862`).
- Drop support for Python 3.5 (:pr:`1863`).
- Test against Python 3.10 (:pr:`1888`).

3.13.0

*******************

Features:

- Replace ``missing``/``default`` field parameters with
``load_default``/``dump_default`` (:pr:`1742`).
Thanks :user:`sirosen` for the PR.

Deprecations:

- The use of ``missing``/``default`` field parameters is deprecated and will be
removed in marshmallow 4. ``load_default``/``dump_default`` should be used
instead.

3.12.2

*******************

Bug fixes:

- Don't expose ``Field``\s as ``Schema`` attributes. This reverts a change
introduced in 3.12.0 that causes issues when field names conflict with
``Schema`` attributes or methods. ``Fields``\s are still accessible on a
``Schema`` instance through the ``fields`` attribute. (:pr:`1843`)

3.12.1

*******************

Bug fixes:

- Fix bug that raised an ``AttributeError`` when instantiating a
``Schema`` with a field named ``parent`` (:issue:`1808`).
Thanks :user:`flying-sheep` for reporting and helping with the fix.

3.12.0

*******************

Features:

- Add ``validate.And`` (:issue:`1768`).
Thanks :user:`rugleb` for the suggestion.
- Add type annotations to ``marshmallow.decorators`` (:issue:`1788`, :pr:`1789`).
Thanks :user:`michaeldimchuk` for the PR.
- Let ``Field``\s be accessed by name as ``Schema`` attributes (:pr:`1631`).

Other changes:

- Improve types in ``marshmallow.validate`` (:pr:`1786`).
- Make ``marshmallow.validate.Validator`` an abstract base class (:pr:`1786`).
- Remove unnecessary list cast (:pr:`1785`).

3.11.1

*******************

Bug fixes:

- Fix treatment of dotted keys when ``unknown=INCLUDE`` (:issue:`1506`).
Thanks :user:`rbu` for reporting and thanks :user:`sirosen` for the fix (:pr:`1745`).

3.11.0

*******************

Features:

- Add ``fields.IPInterface``, ``fields.IPv4Interface``, and
``IPv6Interface`` (:issue:`1733`). Thanks :user:`madeinoz67`
for the suggestion and the PR.
- Raise ``AttributeError`` for missing methods when using ``fields.Method`` (:pr:`1675`).
Thanks :user:`lassandroan`.

Other changes:

- Remove unnecessary ``hasattr`` and ``getattr`` checks in ``Field`` (:pr:`1770`).

3.10.0

*******************

Deprecations:

- Passing field metadata via keyword arguments is deprecated and will be
removed in marshmallow 4 (:issue:`1350`). Use the explicit ``metadata=...``
argument instead. Thanks :user:`sirosen`.

3.9.1

******************

Bug fixes:

- Cast to mapping type in ``Mapping.serialize`` and ``Mapping.deserialize``
(:pr:`1685`).
- Fix bug letting ``Dict`` pass invalid dict on deserialization when no key or
value ``Field`` is specified (:pr:`1685`).

3.9.0

******************

Features:

- Add ``format`` argument to ``fields.Time`` and ``timeformat`` ``class Meta`` option (:issue:`686`).
Thanks :user:`BennyAlex` for the suggestion and thanks :user:`infinityxxx` for the PR.

Other changes:

- Remove usage of implicit ``typing.Optional`` (:issue:`1663`).
Thanks :user:`nadega` for the PR.

3.8.0

******************

Features:

- Add ``fields.IP``, ``fields.IPv4`` and ``fields.IPv6`` (:pr:`1485`). Thanks
:user:`mgetka` for the PR.

Bug fixes:

- Fix typing in ``AwareDateTime`` (:pr:`1658`). Thanks :user:`adithyabsk` for
reporting.

3.7.1

******************

Bug fixes:

- ``fields.Boolean`` correctly serializes non-hashable types (:pr:`1633`).
Thanks :user:`jun0jang` for the PR.

3.7.0

******************

Deprecations:

- ``marshmallow.pprint`` is deprecated and will be removed in marshmallow 4 (:issue:`1588`).

Support:

- Document ``default_error_messages`` on field classes (:pr:`1619`). Thanks :user:`weeix`.

Bug fixes:

- Fix passing ``only`` and ``exclude`` to ``Nested`` with an ordered ``Schema`` (:pr:`1627`).
Thanks :user:`juannorris` for the PR.

3.6.1

******************

No code changes--only docs and contributor-facing updates in this release.

Support:

- Documentation: improve custom fields example (:issue:`1538`).
Thanks :user:`pablospizzamiglio` for reporting the problem with the
old example and thanks :user:`Resinderate` for the PR.
- Documentation: Split up API reference into multiple pages and
add summary tables (:pr:`1587`). Thanks :user:`EpicWink` for the PR.

3.6.0

******************

Features:

- Add ``validate.ContainsNoneOf`` (:issue:`1528`).
Thanks :user:`Resinderate` for the suggestion and the PR.

3.5.2

******************

Bug fixes:

- Fix typing in ``class_registry`` (:pr:`1574`). Thanks :user:`mahenzon`.

3.5.1

******************

Bug fixes:

- Includes bug fix from 2.21.0.

3.5.0

******************

Bug fixes:

- Fix list of nullable nested fields ``List(Nested(Field, allow_none=True)``
(:issue:`1497`). Because this fix reverts an optimization introduced to
speed-up serialization and deserialization of lists of nested fields, a
negative impact on performance in this specific case is expected.

3.4.0

******************

Features:

- Improve type coverage (:issue:`1479`). Thanks :user:`Reskov`.

Bug fixes:

- Fix typing for ``data`` param of ``Schema.load`` and ``ValidationError`` (:issue:`1492`).
Thanks :user:`mehdigmira` for reporting and thanks :user:`dfirst` for the PR.

Other changes:

- Remove unnecessary typecasts (:pr:`1500`). Thanks :user:`hukkinj1`.
- Remove useless ``_serialize`` override in ``UUID`` field (:pr:`1489`).

3.3.0

******************

Features:

- ``fields.Nested`` may take a callable that returns a schema instance.
Use this to resolve order-of-declaration issues when schemas nest each other (:issue:`1146`).

.. code-block:: python

  <3.3
 class AlbumSchema(Schema):
     title = fields.Str()
     artist = fields.Nested("ArtistSchema", only=("name",))


 class ArtistSchema(Schema):
     name = fields.Str()
     albums = fields.List(fields.Nested(AlbumSchema))


  >=3.3
 class AlbumSchema(Schema):
     title = fields.Str()
     artist = fields.Nested(lambda: ArtistSchema(only=("name",)))


 class ArtistSchema(Schema):
     name = fields.Str()
     albums = fields.List(fields.Nested(AlbumSchema))

Deprecations:

- Passing the string ``"self"`` to ``fields.Nested`` is deprecated.
Use a callable instead.

.. code-block:: python

 from marshmallow import Schema, fields

  <3.3
 class PersonSchema(Schema):
     partner = fields.Nested("self", exclude=("partner",))
     friends = fields.List(fields.Nested("self"))


  >=3.3
 class PersonSchema(Schema):
     partner = fields.Nested(lambda: PersonSchema(exclude=("partner")))
     friends = fields.List(fields.Nested(lambda: PersonSchema()))

Other changes:

- Fix typing for ``Number._format_num`` (:pr:`1466`). Thanks :user:`hukkinj1`.
- Make mypy stricter and remove dead code (:pr:`1467`). Thanks again, :user:`hukkinj1`.

3.2.2

******************

Bug fixes:

- Don't load fields for which ``load_only`` and ``dump_only`` are both ``True`` (:pr:`1448`).
- Fix types in ``marshmallow.validate`` (:pr:`1446`).

Support:

- Test against Python 3.8 (:pr:`1431`).

3.2.1

++++++++++++++++++

Bug fixes:

- Fix typing for ``Schema.dump[s]`` (:pr:`1416`).

3.2.0

++++++++++++++++++

Features:

- Add type annotations to ``marshmallow.schema`` and ``marshmallow.validate`` (:pr:`1407`, :issue:`663`).

Bug fixes:

- Fix compatibility with Python < 3.5.3 (:issue:`1409`). Thanks :user:`lukaszdudek-silvair` for reporting.

Refactoring:

- Remove unnecessary ``BaseSchema`` superclass (:pr:`1406`).

3.1.1

++++++++++++++++++

Bug fixes:

- Restore inheritance hierarchy of ``Number`` fields (:pr:`1403`).
``fields.Integer`` and ``fields.Decimal`` inherit from ``fields.Number``.
- Fix bug that raised an uncaught error when a nested schema instance had an unpickleable object in its context (:issue:`1404`).
Thanks :user:`metheoryt` for reporting.

3.1.0

++++++++++++++++++

Features:

- Add more type annotations (:issue:`663`).
Type information is distributed per `PEP 561 <https://www.python.org/dev/peps/pep-0561/>`_ .
Thanks :user:`fuhrysteve` for helping with this.

Bug fixes:

- Includes bug fix from 2.20.5.

3.0.5

++++++++++++++++++

Bug fixes:

- Fix bug that raised an uncaught error when passing both a schema instance and ``only`` to ``Nested`` (:pr:`1395`).
This bug also affected passing a schema instance to ``fields.Pluck``.

3.0.4

++++++++++++++++++

Bug fixes:

- Fix propagating dot-delimited ``only`` and ``exclude`` parameters to nested schema instances (:issue:`1384`).
- Includes bug fix from 2.20.4 (:issue:`1160`).

3.0.3

++++++++++++++++++

Bug fixes:

- Handle when ``data_key`` is an empty string (:issue:`1378`).
Thanks :user:`jtrakk` for reporting.

3.0.2

++++++++++++++++++

Bug fixes:

- Includes bug fix from 2.20.3 (:pr:`1376`).
- Fix incorrect ``super()`` call in ``SchemaMeta.__init__`` (:pr:`1362`).

3.0.1

++++++++++++++++++

Bug fixes:

- Fix bug when nesting ``fields.DateTime`` within ``fields.List`` or ``fields.Tuple`` (:issue:`1357`).
This bug was introduced in 3.0.0rc9. Thanks :user:`zblz` for reporting.

3.0.0

++++++++++++++++++

Features:

- Optimize ``List(Nested(...))`` (:issue:`779`).
- Minor performance improvements and cleanup (:pr:`1328`).
- Add ``Schema.from_dict`` (:issue:`1312`).

Deprecations/Removals:

- ``Field.fail`` is deprecated. Use ``Field.make_error`` instead.
- Remove UUID validation from ``fields.UUID``, for consistency with other fields (:issue:`1132`).

Support:

- Various docs improvements (:pr:`1329`).

3.0.0rc9

+++++++++++++++++++++

Features:

- *Backwards-incompatible*: Validation does not occur on serialization (:issue:`1132`).
This significantly improves serialization performance.
- *Backwards-incompatible*: ``DateTime`` does not affect timezone information
on serialization and deserialization (:issue:`1234`, :pr:`1278`).
- Add ``NaiveDateTime`` and ``AwareDateTime`` to enforce timezone awareness
(:issue:`1234`, :pr:`1287`).
- *Backwards-incompatible*: ``List`` does not wrap single values in a list on
serialization (:pr:`1307`).
- *Backwards-incompatible*: ``Schema.handle_error`` receives ``many`` and ``partial`` as keyword arguments (:pr:`1321`).
- Use ``raise from`` more uniformly to improve stack traces (:pr:`1313`).
- Rename ``Nested.__schema`` to ``Nested._schema`` to prevent name mangling (:issue:`1289`).
- Performance improvements (:pr:`1309`).

Deprecations/Removals:

- ``LocalDateTime`` is removed (:issue:`1234`).
- ``marshmallow.utils.utc`` is removed. Use ``datetime.timezone.utc`` instead.

Bug fixes:

- Fix behavior of ``List(Nested("self"))`` (`779 (comment) <https://github.com/marshmallow-code/marshmallow/issues/779#issuecomment-396354987>`_).

Support:

- Document usage of ``validate.Regexp``'s usage ``re.search`` (:issue:`1285`). Thanks :user:`macdonaldezra`.

3.0.0rc8

+++++++++++++++++++++

Features:

- Propagate ``only`` and ``exclude`` parameters to ``Nested`` fields
within ``List`` and ``Dict`` (:issue:`779`, :issue:`946`).
- Use ``email.utils.parsedate_to_datetime`` instead of conditionally
using dateutil for parsing RFC dates (:pr:`1246`).
- Use internal util functions instead of conditionally using dateutil
for parsing  ISO 8601 datetimes, dates and times. Timezone info is now
correctly deserialized whether or not dateutil is installed. (:pr:`1265`)
- Improve error messages for ``validate.Range``.
- Use ``raise from error`` for better stack traces (:pr:`1254`). Thanks
:user:`fuhrysteve`.
- python-dateutil is no longer used. This resolves the inconsistent behavior
based on the presence of python-dateutil (:issue:`497`, :issue:`1234`).

Bug fixes:

- Fix method resolution for ``__init__`` method of ``fields.Email`` and
``fields.URL`` (:issue:`1268`). Thanks :user:`dursk` for the catch and patch.
- Includes bug fixes from 2.19.4 and 2.19.5.

Other changes:

- *Backwards-incompatible*: Rename ``fields.List.container`` to ``fields.List.inner``,
``fields.Dict.key_container`` to ``fields.Dict.key_field``, and
``fields.Dict.value_container`` to ``fields.Dict.value_field``.
- Switch to Azure Pipelines for CI (:issue:`1261`).

3.0.0rc7

+++++++++++++++++++++

Features:

- *Backwards-incompatible*: ``many`` is passed as a keyword argument to methods decorated with
``pre_load``, ``post_load``, ``pre_dump``, ``post_dump``,
and ``validates_schema``. ``partial`` is passed as a keyword argument to
methods decorated with ``pre_load``, ``post_load`` and ``validates_schema``.
``**kwargs`` should be added to all decorated methods.
- Add ``min_inclusive`` and ``max_exclusive`` parameters to
``validate.Range`` (:issue:`1221`). Thanks :user:`kdop` for the PR.

Bug fixes:

- Fix propagation of ``partial`` to ``Nested`` containers (part of :issue:`779`).
- Includes bug fix from 2.19.3.

Other changes:

- *Backwards-incompatible*: Use keyword-only arguments (:issue:`1216`).

3.0.0rc6

+++++++++++++++++++++

Support:

- *Backwards-incompatible*: Remove support for Python 2 (:issue:`1120`).
Only Python>=3.5 is supported.
Thank you :user:`rooterkyberian` for the suggestion and the PR.
- *Backwards-incompatible*: Remove special-casing in ``fields.List`` and
``fields.Tuple`` for accessing nested attributes (:pr:`1188`).
Use ``fields.List(fields.Pluck(...))`` instead.
- Add ``python_requires`` to ``setup.py`` (:pr:`1194`).
Thanks :user:`hugovk`.
- Upgrade syntax with ``pyupgrade`` in pre-commit (:pr:`1195`). Thanks
again :user:`hugovk`.

3.0.0rc5

+++++++++++++++++++++

Features:

- Allow input value to be included in error messages
for a number of fields (:pr:`1129`). Thanks :user:`hdoupe` for the PR.
- Improve default error messages for ``OneOf`` and ``ContainsOnly``
(:issue:`885`). Thanks :user:`mcgfeller` for the suggestion
and :user:`maxalbert` for the PR.

Deprecations/Removals:

- Remove ``fields.FormattedString`` (:issue:`1141`). Use
``fields.Function`` or ``fields.Method`` instead.

Bug fixes:

- Includes bug fix from 2.19.2.

3.0.0rc4

+++++++++++++++++++++

Features:

- Add ``fields.Tuple`` (:issue:`1103`) Thanks :user:`zblz` for the PR.
- Add ``fields.Mapping``, which makes it easier to support other
mapping types (e.g. ``OrderedDict``)  (:issue:`1092`).
Thank :user:`sayanarijit` for the suggestion and the PR.

3.0.0rc3

+++++++++++++++++++++

Features:

- Make the error messages for "unknown fields" and "invalid data type"
configurable (:issue:`852`). Thanks :user:`Dunstrom` for the PR.
- ``fields.Boolean`` parses ``"yes"``/``"no"`` values (:pr:`1081`).
Thanks :user:`r1b`.

Other changes:

- *Backwards-incompatible with previous 3.x versions*: Change ordering
of ``keys`` and ``values`` arguments to ``fields.Dict``.
- Remove unused code in ``marshmallow.utils``: ``is_indexable_but_not_string``,
``float_to_decimal``, ``decimal_to_fixed``, ``from_iso`` (:pr:`1088`).
- Remove unused ``marshmallow.compat.string_types``.

Bug fixes:

- Includes bug fix from 2.18.0.

3.0.0rc2

+++++++++++++++++++++

Features:

- Add ``register`` *class Meta* option to allow bypassing marshmallow's
internal class registry when memory usage is critical (:issue:`660`).

Bug fixes:

- Fix serializing dict-like objects with properties (:issue:`1060`).
Thanks :user:`taion` for the fix.
- Fix populating ``ValidationError.valid_data`` for ``List`` and
``Dict`` fields (:issue:`766`).

Other changes:

- Add ``marshmallow.__version_info__`` (:pr:`1074`).
- Remove the ``marshmallow.marshalling`` internal module (:pr:`1070`).
- A ``ValueError`` is raised when the ``missing`` parameter is passed
for required fields (:issue:`1040`).
- Extra keyword arguments passed to ``ValidationError`` in validators
are no longer passed to the final ``ValidationError`` raised upon
validation completion (:issue:`996`).

3.0.0rc1

+++++++++++++++++++++

Features:

- *Backwards-incompatible*: Rework ``ValidationError`` API.
It now expects a single field name, and error structures are merged
in the final ``ValidationError`` raised when validation completes.
This allows schema-level validators to raise errors for individual
fields (:issue:`441`). Thanks :user:`maximkulkin` for
writing the original ``merge_errors`` implementation in :pr:`442` and thanks
:user:`lafrech` for completing the implementation in :pr:`1026`.

Bug fixes:

- Fix ``TypeError`` when serializing ``None`` with ``Pluck`` (:pr:`1049`).
Thanks :user:`toffan` for the catch and patch.

3.0.0b20

+++++++++++++++++++++

Bug fixes:

- Includes bug fixes from 2.16.2 and 2.16.3.

3.0.0b19

+++++++++++++++++++++

Features:

- Support partial loading of nested fields (:pr:`438`). Thanks
:user:`arbor-dwatson` for the PR. *Note*: Subclasses of ``fields.Nested``
now take an additional ``partial`` parameter in the ``_deserialize``
method.

Bug fixes:

- Restore ``Schema.TYPE_MAPPING``, which was removed in 3.0.0b17 (:issue:`1012`).

Other changes:

- *Backwards-incompatible*: ``_serialize`` and ``_deserialize`` methods of
all ``fields.Field`` subclasses must accept ``**kwargs`` (:pr:`1007`).

3.0.0b18

+++++++++++++++++++++

Bug fixes:

- Fix ``Date`` deserialization when using custom format (:issue:`1001`). Thanks
:user:`Ondkloss` for reporting.

Deprecations/Removals:

- ``prefix`` parameter or ``Schema`` class is removed (:issue:`991`). The same
can be achieved using a ``post_dump`` method.

3.0.0b17

+++++++++++++++++++++

Features:

- Add ``format`` option to ``Date`` field (:pr:`869`).
- *Backwards-incompatible*: Rename ``DateTime``'s ``dateformat`` Meta option
to ``datetimeformat``. ``dateformat`` now applies to ``Date`` (:pr:`869`).
Thanks :user:`knagra` for implementing these changes.
- Enforce ISO 8601 when deserializing date and time (:issue:`899`).
Thanks :user:`dushr` for the report and the work on the PR.
- *Backwards-incompatible*: Raise ``ValueError`` on ``Schema`` instantiation in
case of ``attribute`` or ``data_key`` collision (:pr:`992`).

Bug fixes:

- Fix inconsistencies in field inference by refactoring the inference feature
into a dedicated field (:issue:`809`). Thanks :user:`taion` for the PR.
- When ``unknown`` is not passed to ``Nested``, default to nested ``Schema``
``unknown`` meta option rather than ``RAISE`` (:pr:`963`).
Thanks :user:`vgavro` for the PR.
- Fix loading behavior of ``fields.Pluck`` (:pr:`990`).
- Includes bug fix from 2.16.0.

3.0.0b16

+++++++++++++++++++++

Bug fixes:

- Fix ``root`` attribute for nested container fields
on inheriting schemas (:issue:`956`). Thanks :user:`bmcbu`
for reporting.

3.0.0b15

+++++++++++++++++++++

Bug fixes:

- Raise ``ValidationError`` instead of ``TypeError`` when non-iterable types are
validated with ``many=True`` (:issue:`851`).
- ``many=True`` no longer iterates over ``str`` and ``collections.abc.Mapping`` objects and instead
raises a ``ValidationError`` with ``{'_schema': ['Invalid input type.']}`` (:issue:`930`).
- Return ``[]`` as ``ValidationError.valid_data`` instead of ``{}`` when
``many=True`` (:issue:`907`).

Thanks :user:`tuukkamustonen` for implementing these changes.

3.0.0b14

+++++++++++++++++++++

Features:

- Add ``fields.Pluck`` for serializing a single field from a nested object
(:issue:`800`). Thanks :user:`timc13` for the feedback and :user:`deckar01`
for the implementation.
- *Backwards-incompatible*: Passing a string argument as ``only`` to
``fields.Nested`` is no longer supported. Use ``fields.Pluck`` instead
(:issue:`800`).
- Raise a ``StringNotCollectionError`` if ``only`` or ``exclude`` is
passed as a string to ``fields.Nested`` (:pr:`931`).
- *Backwards-incompatible*: ``Float`` takes an ``allow_nan`` parameter to
explicitly allow serializing and deserializing special values (``nan``,
``inf`` and ``-inf``). ``allow_nan`` defaults to ``False``.

Other changes:

- *Backwards-incompatible*: ``Nested`` field now defaults to ``unknown=RAISE``
instead of ``EXCLUDE``. This harmonizes behavior with ``Schema`` that
already defaults to ``RAISE`` (:issue:`908`). Thanks :user:`tuukkamustonen`.
- Tested against Python 3.7.

3.0.0b13

+++++++++++++++++++++

Bug fixes:

- Errors reported by a schema-level validator for a field in a ``Nested`` field
are stored under corresponding field name, not ``_schema`` key (:pr:`862`).
- Includes bug fix from 2.15.4.

Other changes:

- *Backwards-incompatible*: The ``unknown`` option now defaults to ``RAISE``
(`524 (comment) <https://github.com/marshmallow-code/marshmallow/issues/524#issuecomment-397165731>`_,
:issue:`851`).
- *Backwards-incompatible*: When a schema error is raised with a ``dict`` as
payload, the ``dict`` overwrites any existing error list. Before this change,
it would be appended to the list.
- Raise a `StringNotCollectionError` if ``only`` or ``exclude`` is
passed as a string (:issue:`316`). Thanks :user:`paulocheque` for
reporting.

3.0.0b12

+++++++++++++++++++++

Features:

- The behavior to apply when encountering unknown fields while deserializing
can be controlled with the ``unknown`` option (:issue:`524`,
:issue:`747`, :issue:`127`).
It makes it possible to either "include", "exclude", or "raise".
Thanks :user:`tuukkamustonen` for the suggestion and thanks
:user:`ramnes` for the PR.

.. warning::

The default for ``unknown`` will be changed to ``RAISE`` in the
next release.

Other changes:

- *Backwards-incompatible*: Pre/Post-processors MUST return modified data.
Returning ``None`` does not imply data were mutated (:issue:`347`). Thanks
:user:`tdevelioglu` for reporting.
- *Backwards-incompatible*: ``only`` and ``exclude`` are bound by
declared and additional fields. A ``ValueError`` is raised if invalid
fields are passed (:issue:`636`). Thanks :user:`jan-23` for reporting.
Thanks :user:`ikilledthecat` and :user:`deckar01` for the PRs.
- Format code using pre-commit (:pr:`855`).

Deprecations/Removals:

- ``ValidationError.fields`` is removed (:issue:`840`). Access field
instances from ``Schema.fields``.

3.0.0b11

+++++++++++++++++++++

Features:

- Clean up code for schema hooks (:pr:`814`). Thanks :user:`taion`.
- Minor performance improvement from simplifying ``utils.get_value`` (:pr:`811`). Thanks again :user:`taion`.
- Add ``require_tld`` argument to ``fields.URL`` (:issue:`749`). Thanks
:user:`DenerKup` for reporting and thanks :user:`surik00` for the PR.
- ``fields.UUID`` deserializes ``bytes`` strings using ``UUID(bytes=b'...')`` (:pr:`625`).
Thanks :user:`JeffBerger` for the suggestion and the PR.

Bug fixes:

- Fields nested within ``Dict`` correctly inherit context from their
parent schema (:issue:`820`). Thanks :user:`RosanneZe` for reporting
and :user:`deckar01` for the PR.
- Includes bug fix from 2.15.3.

3.0.0b10

+++++++++++++++++++++

Bug fixes:

- Includes bugfixes from 2.15.2.

3.0.0b9

++++++++++++++++++++

Features:

- *Backwards-incompatible*: ``missing`` and ``default`` values are
passed in deserialized form (:issue:`378`). Thanks :user:`chadrik` for
the suggestion and thanks :user:`lafrech` for the PR.

Bug fixes:

- Includes the bugfix from 2.15.1.

3.0.0b8

++++++++++++++++++++

Features:

- *Backwards-incompatible*: Add ``data_key`` parameter to fields for
specifying the key in the input and output data dict. This
parameter replaces both ``load_from`` and ``dump_to`` (:issue:`717`).
Thanks :user:`lafrech`.
- *Backwards-incompatible*: When ``pass_original=True`` is passed to one
of the decorators and a collection is being (de)serialized, the
``original_data`` argument will be a single object unless
``pass_many=True`` is also passed to the decorator (:issue:`315`,
:issue:`743`). Thanks :user:`stj` for the PR.
- *Backwards-incompatible*: Don't recursively check nested required
fields when the ``Nested`` field's key is missing (:issue:`319`). This
reverts :pr:`235`. Thanks :user:`chekunkov` reporting and thanks
:user:`lafrech` for the PR.
- *Backwards-incompatible*: Change error message collection for ``Dict`` field (:issue:`730`). Note:
this is backwards-incompatible with previous 3.0.0bX versions.
Thanks :user:`shabble` for the report and thanks :user:`lafrech` for the PR.

3.0.0b7

++++++++++++++++++++

Features:

- *Backwards-incompatible*: Schemas are always strict (:issue:`377`).
The ``strict`` parameter is removed.
- *Backwards-incompatible*: ``Schema().load`` and ``Schema().dump`` return ``data`` instead of a
``(data, errors)`` tuple (:issue:`598`).
- *Backwards-incomaptible*: ``Schema().load(None)`` raises a
``ValidationError`` (:issue:`511`).

See :ref:`upgrading_3_0` for a guide on updating your code.

Thanks :user:`lafrech` for implementing these changes.
Special thanks to :user:`MichalKononenko`, :user:`douglas-treadwell`, and
:user:`maximkulkin` for the discussions on these changes.


Other changes:

- *Backwards-incompatible*: Field name is not checked when ``load_from``
is specified (:pr:`714`). Thanks :user:`lafrech`.

Support:

- Add `Code of Conduct <https://marshmallow.readthedocs.io/en/dev/code_of_conduct.html>`_.

3.0.0b6

++++++++++++++++++++

Bug fixes:

- Fixes ``ValidationError.valid_data`` when a nested field contains errors
(:issue:`710`). This bug was introduced in 3.0.0b3. Thanks
:user:`lafrech`.

Other changes:

- *Backwards-incompatible*: ``Email`` and ``URL`` fields don't validate
on serialization (:issue:`608`). This makes them more consistent with the other
fields and improves serialization performance. Thanks again :user:`lafrech`.
- ``validate.URL`` requires square brackets around IPv6 URLs (:issue:`707`). Thanks :user:`harlov`.

3.0.0b5

++++++++++++++++++++

Features:

- Add support for structured dictionaries by providing values and keys arguments to the
``Dict`` field's constructor. This mirrors the ``List``
field's ability to validate its items (:issue:`483`). Thanks :user:`deckar01`.

Other changes:

- *Backwards-incompatible*: ``utils.from_iso`` is deprecated in favor of
``utils.from_iso_datetime`` (:issue:`694`). Thanks :user:`sklarsa`.

3.0.0b4

++++++++++++++++++++

Features:

- Add support for millisecond, minute, hour, and week precisions to
``fields.TimeDelta`` (:issue:`537`). Thanks :user:`Fedalto` for the
suggestion and the PR.
- Includes features from release 2.14.0.


Support:

- Copyright year in docs uses ``CHANGELOG.rst``'s modified date for
reproducible builds (:issue:`679`). Thanks :user:`bmwiedemann`.
- Test against Python 3.6 in tox. Thanks :user:`Fedalto`.
- Fix typo in exception message (:issue:`659`). Thanks :user:`wonderbeyond`
for reporting and thanks :user:`yoichi` for the PR.

3.0.0b3

++++++++++++++++++++

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`.

3.0.0b2

++++++++++++++++++++

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.

3.0.0b1

++++++++++++++++++++

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`).

3.0.0a1

++++++++++++++++++++

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.

2.21.0

+++++++++++++++++++

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`).

2.20.5

+++++++++++++++++++

Bug fixes:

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

2.20.4

+++++++++++++++++++

Bug fixes:

- Respect the ``many`` value on ``Schema`` instances passed to ``Nested`` (:issue:`1160`).
Thanks :user:`Kamforka` for reporting.

2.20.3

+++++++++++++++++++

Bug fixes:

- Don't swallow ``TypeError`` exceptions raised by ``Field._bind_to_schema`` or ``Schema.on_bind_field`` (:pr:`1376`).

2.20.2

+++++++++++++++++++

Bug fixes:

- Prevent warning about importing from ``collections`` on Python 3.7
(:pr:`1354`). Thanks :user:`nicktimko` for the PR.

2.20.1

+++++++++++++++++++

Bug fixes:

- Fix bug that raised ``TypeError`` when invalid data type is
passed to a nested schema with ``validates`` (:issue:`1342`).

2.20.0

+++++++++++++++++++

Bug fixes:

- Fix deprecated functions' compatibility with Python 2 (:issue:`1337`).
Thanks :user:`airstandley` for the catch and patch.
- Fix error message consistency for invalid input types on nested fields (:issue:`1303`).
This is a backport of the fix in :pr:`857`. Thanks :user:`cristi23` for the
thorough bug report and the PR.

Deprecation/Removal:

- Python 2.6 is no longer officially supported (:issue:`1274`).

Links

• PyPI: https://pypi.org/project/marshmallow
• Changelog: https://pyup.io/changelogs/marshmallow/
• Repo: https://github.com/marshmallow-code/marshmallow