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6b6d936 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | # Copyright 2009-2024 Joshua Bronson. All rights reserved.
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
"""Functions for iterating over items in a mapping."""
from __future__ import annotations
import typing as t
from operator import itemgetter
from ._typing import KT
from ._typing import VT
from ._typing import ItemsIter
from ._typing import Maplike
from ._typing import MapOrItems
def iteritems(arg: MapOrItems[KT, VT] = (), /, **kw: VT) -> ItemsIter[KT, VT]:
"""Yield the items from *arg* and *kw* in the order given."""
if isinstance(arg, t.Mapping):
yield from arg.items()
elif isinstance(arg, Maplike):
yield from ((k, arg[k]) for k in arg.keys())
else:
yield from arg
yield from t.cast(ItemsIter[KT, VT], kw.items())
swap: t.Final = itemgetter(1, 0)
def inverted(arg: MapOrItems[KT, VT]) -> ItemsIter[VT, KT]:
"""Yield the inverse items of the provided object.
If *arg* has a :func:`callable` ``__inverted__`` attribute,
return the result of calling it.
Otherwise, return an iterator over the items in `arg`,
inverting each item on the fly.
*See also* :attr:`bidict.BidirectionalMapping.__inverted__`
"""
invattr = getattr(arg, '__inverted__', None)
if callable(invattr):
inv: ItemsIter[VT, KT] = invattr()
return inv
return map(swap, iteritems(arg))
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