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# engine/_py_util.py
# Copyright (C) 2005-2025 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: https://www.opensource.org/licenses/mit-license.php
from __future__ import annotations
import typing
from typing import Any
from typing import Mapping
from typing import Optional
from typing import Tuple
from .. import exc
if typing.TYPE_CHECKING:
from .interfaces import _CoreAnyExecuteParams
from .interfaces import _CoreMultiExecuteParams
from .interfaces import _DBAPIAnyExecuteParams
from .interfaces import _DBAPIMultiExecuteParams
_no_tuple: Tuple[Any, ...] = ()
def _distill_params_20(
params: Optional[_CoreAnyExecuteParams],
) -> _CoreMultiExecuteParams:
if params is None:
return _no_tuple
# Assume list is more likely than tuple
elif isinstance(params, list) or isinstance(params, tuple):
# collections_abc.MutableSequence): # avoid abc.__instancecheck__
if params and not isinstance(params[0], (tuple, Mapping)):
raise exc.ArgumentError(
"List argument must consist only of tuples or dictionaries"
)
return params
elif isinstance(params, dict) or isinstance(
# only do immutabledict or abc.__instancecheck__ for Mapping after
# we've checked for plain dictionaries and would otherwise raise
params,
Mapping,
):
return [params]
else:
raise exc.ArgumentError("mapping or list expected for parameters")
def _distill_raw_params(
params: Optional[_DBAPIAnyExecuteParams],
) -> _DBAPIMultiExecuteParams:
if params is None:
return _no_tuple
elif isinstance(params, list):
# collections_abc.MutableSequence): # avoid abc.__instancecheck__
if params and not isinstance(params[0], (tuple, Mapping)):
raise exc.ArgumentError(
"List argument must consist only of tuples or dictionaries"
)
return params
elif isinstance(params, (tuple, dict)) or isinstance(
# only do abc.__instancecheck__ for Mapping after we've checked
# for plain dictionaries and would otherwise raise
params,
Mapping,
):
# cast("Union[List[Mapping[str, Any]], Tuple[Any, ...]]", [params])
return [params] # type: ignore
else:
raise exc.ArgumentError("mapping or sequence expected for parameters")