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This commit documents and verifies the current absence of `__init_subclass__` functionality, in anticipation of a possible future PEP487 'metaclasses lite' patch. The main `core_class_initsubclass.py` test verifies if the method is automatically called, while the other three verify other orthogonal properties it should have: if the method is an implicit classmethod; if MicroPython supplies the base case for the usual recursive function body the PEP encourages; and if kwargs inheritance parameters work correctly. Signed-off-by: Anson Mansfield <amansfield@mantaro.com>
23 lines
782 B
Python
23 lines
782 B
Python
"""
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categories: Core,Classes
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description: MicroPython doesn't support parameterized ``__init_subclass__`` class customization.
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cause: MicroPython does not currently implement PEP 487. The MicroPython syntax tree does not include a kwargs node after the class inheritance list.
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workaround: Use class variables or another mechanism to specify base-class customizations.
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"""
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class Base:
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@classmethod
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def __init_subclass__(cls, arg=None, **kwargs):
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cls.init_subclass_was_called = True
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print(f"Base.__init_subclass__({cls.__name__}, {arg=!r}, {kwargs=!r})")
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class A(Base, arg="arg"):
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pass
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# Regularize across MicroPython not automatically calling __init_subclass__ either.
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if not getattr(A, "init_subclass_was_called", False):
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A.__init_subclass__()
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