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-rw-r--r--polymatrix/expression/mixins/legendreseriesmixin.py7
1 files changed, 6 insertions, 1 deletions
diff --git a/polymatrix/expression/mixins/legendreseriesmixin.py b/polymatrix/expression/mixins/legendreseriesmixin.py
index bec4c6c..bd8552f 100644
--- a/polymatrix/expression/mixins/legendreseriesmixin.py
+++ b/polymatrix/expression/mixins/legendreseriesmixin.py
@@ -1,9 +1,14 @@
+from __future__ import annotations
+
import abc
+import typing
+
+if typing.TYPE_CHECKING:
+ from polymatrix.expressionstate.abc import ExpressionState
from polymatrix.utils.getstacklines import FrameSummary
from polymatrix.polymatrix.abc import PolyMatrix
from polymatrix.polymatrix.init import init_poly_matrix
-from polymatrix.expressionstate.abc import ExpressionState
from polymatrix.expression.mixins.expressionbasemixin import ExpressionBaseMixin