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Depend on useful-types only when type-checking #161

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merged 1 commit into from
Nov 13, 2024
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Depend on useful-types only when type-checking #161

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8 changes: 5 additions & 3 deletions pymbolic/mapper/substitutor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,15 +39,17 @@
THE SOFTWARE.
"""
from collections.abc import Callable
from typing import Any

from useful_types import SupportsGetItem, SupportsItems
from typing import TYPE_CHECKING, Any

from pymbolic.mapper import CachedIdentityMapper, IdentityMapper
from pymbolic.primitives import AlgebraicLeaf
from pymbolic.typing import ExpressionT


if TYPE_CHECKING:
from useful_types import SupportsGetItem, SupportsItems


class SubstitutionMapper(IdentityMapper[[]]):
def __init__(
self, subst_func: Callable[[AlgebraicLeaf], ExpressionT | None]
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