Fix typecheck

src/pystencils/sympyextensions/__init__.py

@@ -2,6 +2,7 @@ from .astnodes import ConditionalFieldAccess
 from .typed_sympy import TypedSymbol, CastFunc
 from .pointers import mem_acc
 from .reduction import reduced_assign
+from .binop_mapping import binop_str_to_expr
 
 from .math import (
     prod,
@@ -35,6 +36,7 @@ from .math import (
 __all__ = [
     "ConditionalFieldAccess",
     "reduced_assign",
+    "binop_str_to_expr",
     "TypedSymbol",
     "CastFunc",
     "mem_acc",

src/pystencils/sympyextensions/binop_mapping.py

 from operator import truediv, mul, sub, add
 
-from src.pystencils.backend.ast.expressions import PsCall, PsExpression
-from src.pystencils.backend.exceptions import FreezeError
-from src.pystencils.backend.functions import MathFunctions, PsMathFunction
+from ..backend.ast.expressions import PsCall, PsExpression
+from ..backend.exceptions import FreezeError
+from ..backend.functions import MathFunctions, PsMathFunction
 
 _available_operator_interface: set[str] = {'+', '-', '*', '/'}