Getconf

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- Nothing changed yet.

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*Bugfix:*

* Fix support for simple enum.Enum objects (not inheriting ``str``) in ``getenum`` getter.
* Delay ``default`` value validation in ``getenum`` getter.

*Note:*

* Switch test runner to pytest
* Add official support of Python 3.10
* Python 3.5 and 3.6 support will be dropped in the next minor version.

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*New:*

* Add support for enum.Enum based objects through the new ``getenum`` getter.

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*New:*

* Add support of pathlib.Path objects, both in loading the config
and through the new ``getpath`` getter.
* Add ``mandatory_section`` option to ``ConfigGetter`` to enforce the use
of a section in requested keys (and its underlying option ``key_validator`` on
``BaseConfigGetter`` to validate keys format)

*Removed:*

* Drop support of Python 2.7 which reached EOL in January 2020
* Drop support of Python 3.4 which reached EOL in 2019

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*Removed:*

* Drop support of Python 3.3 which reached EOL in September 2017

*Deprecated:*

* Use of list of non-strings as getconf.getlist() default value is deprecated

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*New:*

* Add ``BaseConfigGetter`` and the notion of "finders" to ease customization.

*Note:*

* Python 2.7 and 3.3 support will be dropped in next minor version.