Filters

**Important:** If you are currently using ISO filters (`Country`, `Currency` and `Locale`), please wait to upgrade until the 1.2.1 release!

* Introduced extensions framework (more info below).
* Removed ISO filters.
* These will be made available as an extra in the 1.2.1 release.
* If you do not need ISO filters, you may remove the following dependencies from your virtualenv:
* iso3166
* language_tags
* py-moneyed
* Standardized test instructions across pip, travis and tox.
* Little bit of code cleanup.

Extensions Framework
Filters v1.2.0 introduces a new "extensions" framework that allows you to add your own filters to the (nearly) top-level namespace*.

Extension filters are available from `filters.ext`. For example:

import filters as f
f.ext.Country().apply('pe')

\* (we opted to create a separate namespace because IDEs were going insane when we tried injecting symbols directly into the `filters` module scope)

To take advantage of this feature, add `filters.extensions` entry points to your package's `setup.py` file:

setup(
...
entry_points = {
'filters.extensions': [
Load all filters from a single module.
'iso = filters_iso',

Load a single class.
'country = filters_iso:Country',
],
},
)

You can assign any name you want to the entry point; what's important is that the value reference a valid module or class.

Note: extension filters are loaded at runtime when importing the `filters` package.

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* [13] `FilterMapper.apply` now returns an unordered `dict` by default.
* To restore the previous behavior, pass an `OrderedDict` to the filter's initializer. Example:
python
Filter returns a dict (new behavior):
filter_ = f.FilterMapper({
'id': f.Int,
'subject': f.Required | f.Unicode,
})

Filter returns an OrderedDict (old behavior):
filter_ = f.FilterMapper(OrderedDict((
('id', f.Int),
('subject', f.Required | f.Unicode),
)))

* [15] Fixed ambiguous error message when `FilterMapper` detects an unexpected key in the input.
* `MaxBytes` now returns correct type when using encodings other than UTF-8.
* Chaining a filter with `None` now correctly returns a `FilterChain` instance.

* General code cleanup:
* Improved docstrings and comments.
* Fixed some incorrect type hints.
* Fixed some RST syntax problems.
* Made code formatting more consistent.
* Made some unit tests more fun to read.
* No longer includes `typing` when installing into Python 3 envs.
* Travis now also builds wheels during deployments.

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**⚠️ WARNING ⚠️**
**This version contains backwards-incompatible changes. Please re-run your unit tests after upgrading!**

Backwards-Incompatible Changes
* Removed type check from `Max` and `Min` filters. To restore the old functionality, chain with a `Type` filter. Example:
python
Before:
filter_chain = Max(42)

After:
filter_chain = Type(int) | Max(42)


Additional Changes
* `setup.py` no longer installs py2casefold on Python 3 systems. This also applies when installing from wheels.
* Configured automatic PyPI releases via Travis CI.
* Cleaned up some comments and code formatting.

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* Implemented new `iso` package:
* `Country`: Interprets an incoming value as an ISO 3166-1 alpha-2 or alpha-3 country code.
* `Currency`: Interprets an incoming value as an ISO 4217 currency code.
* `Locale`: Interprets an incoming value as an IETF Language Tag.
* More informative error message when filter test case is misconfigured.
* Cleaned up project metadata.
* Fixed incorrect configuration that breaks the documentation build.
* Improved documentation for partials.

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- Added 3.6 to list of supported Python versions.
- Added missing documentation for `Decimal` filter.

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- Made `setup.py` compatible with older versions of pip.
- Added Travis integration.