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25 lines
673 B
Python
25 lines
673 B
Python
import importlib
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from functools import lru_cache
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from typing import TypeVar
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T = TypeVar('T')
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def import_from(qual_name: str):
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"""Import the value from the qualified name given"""
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parts = qual_name.split('.')
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module_name = '.'.join(parts[:-1])
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module = importlib.import_module(module_name)
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result = getattr(module, parts[-1])
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return result
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@lru_cache()
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def get_impl(cls: type[T], impl_name: str | None) -> type[T]:
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"""Import a named implementation of the specified class"""
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if impl_name is None:
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return cls
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impl_class = import_from(impl_name)
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assert cls == impl_class or issubclass(impl_class, cls)
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return impl_class
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