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45 lines
1.3 KiB
Python
45 lines
1.3 KiB
Python
3 years ago
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import contextlib
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import importlib
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import sys
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import types
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def _is_package(module):
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try:
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module.__getattribute__('__path__')
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except AttributeError:
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return False
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return True
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_NO_ATTRIBUTE = object()
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def passthrough_module(parent, child, *, callback=lambda _: None):
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parent_module = importlib.import_module(parent)
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child_module = importlib.import_module(child, parent)
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class PassthroughModule(types.ModuleType):
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def __getattr__(self, attr):
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if _is_package(parent_module):
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with contextlib.suppress(ImportError):
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return importlib.import_module(f'.{attr}', parent)
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ret = _NO_ATTRIBUTE
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with contextlib.suppress(AttributeError):
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ret = getattr(child_module, attr)
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if _is_package(child_module):
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with contextlib.suppress(ImportError):
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ret = importlib.import_module(f'.{attr}', child)
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if ret is _NO_ATTRIBUTE:
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raise AttributeError(f'module {parent} has no attribute {attr}')
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callback(attr)
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return ret
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# Python 3.6 does not have module level __getattr__
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# https://peps.python.org/pep-0562/
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sys.modules[parent].__class__ = PassthroughModule
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