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20 lines
885 B
Python
20 lines
885 B
Python
from typing import Callable, Optional
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def first_real_override(cls: type, name: str, *, base: type) -> Optional[Callable]:
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"""Return the *callable* override of `name` visible on `cls`, or None if every
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implementation up to (and including) `base` is the placeholder defined on `base`.
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"""
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base_attr = getattr(base, name, None)
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if base_attr is None:
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return None
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base_func = base_attr.__func__
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for c in cls.mro(): # NodeB, NodeA, ComfyNodeV3, object …
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if c is base: # reached the placeholder – we're done
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break
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if name in c.__dict__: # first class that *defines* the attr
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func = getattr(c, name).__func__
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if func is not base_func: # real override
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return getattr(cls, name) # bound to *cls*
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return None
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