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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