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"""DBM-like dummy module"""
from collections import defaultdict
from typing import Any
class DummyDB(dict):
"""Provide dummy DBM-like interface."""
def close(self):
pass
error = KeyError
_DATABASES: defaultdict[Any, DummyDB] = defaultdict(DummyDB)
def open(file, flag="r", mode=0o666): # noqa: A001
"""Open or create a dummy database compatible.
Arguments ``flag`` and ``mode`` are ignored.
"""
# return same instance for same file argument
return _DATABASES[file]
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