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import importlib
import sys
from collections.abc import Iterator
from contextlib import contextmanager
from types import ModuleType
from pathlib import Path
@contextmanager
def import_cleanup() -> Iterator[None]:
"""
Clean up the results of importing modules, including the modification
of :attr:`sys.path` necessary to do so.
"""
modules = set(sys.modules)
path = sys.path.copy()
yield
for added_module in set(sys.modules) - modules:
sys.modules.pop(added_module)
sys.path[:] = path
importlib.invalidate_caches()
INIT_FILE = '__init__.py'
def import_path(path: Path) -> ModuleType:
container = path
while True:
container = container.parent
if not (container / INIT_FILE).exists():
break
relative = path.relative_to(container)
if relative.name == INIT_FILE:
parts = tuple(relative.parts)[:-1]
else:
parts = tuple(relative.parts)[:-1]+(relative.stem,)
module = '.'.join(parts)
try:
return importlib.import_module(module)
except ImportError as e:
raise ImportError(
f'{module!r} not importable from {path} as:\n{type(e).__name__}: {e}'
) from None
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