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Legacy API Wrapper |b-pypi| |b-travis| |b-codecov|
==================================================
.. |b-pypi| image:: https://img.shields.io/pypi/v/legacy-api-wrap.svg
:target: https://pypi.org/project/legacy-api-wrap
.. |b-travis| image:: https://travis-ci.com/flying-sheep/legacy-api-wrap.svg?branch=master
:target: https://travis-ci.com/flying-sheep/legacy-api-wrap
.. |b-codecov| image:: https://codecov.io/gh/flying-sheep/legacy-api-wrap/branch/master/graph/badge.svg
:target: https://codecov.io/gh/flying-sheep/legacy-api-wrap
This module defines a decorator to wrap legacy APIs.
The primary use case is APIs defined before keyword-only parameters existed.
>>> from legacy_api_wrap import legacy_api
We have a function with many positional parameters lying around:
>>> def fn(a, b=None, d=1, c=2):
... return c, d, e
We want to convert the positional parameters ``d`` and ``c`` to keyword-only,
change their order and add a parameter. For this we only need to specify name
and order of the old positional parameters in the decorator.
>>> @legacy_api('d', 'c')
... def fn(a, b=None, *, c=2, d=1, e=3):
... return c, d, e
After adding the decorator, users can keep calling the old API and get a
``DeprecationWarning``:
>>> fn(12, 13, 14) == (2, 14, 3)
True
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