fix(interpreted functions): correctly added missing imports to shortc…

…uts and model init

unified_planning/model/__init__.py

@@ -30,6 +30,7 @@
 )
 from unified_planning.model.fnode import FNode
 from unified_planning.model.fluent import Fluent
+from unified_planning.model.interpreted_function import InterpretedFunction
 from unified_planning.model.object import Object
 from unified_planning.model.operators import OperatorKind
 from unified_planning.model.parameter import Parameter
@@ -93,6 +94,7 @@
     "ExpressionManager",
     "FNode",
     "Fluent",
+    "InterpretedFunction",
     "Object",
     "OperatorKind",
     "Parameter",

unified_planning/shortcuts.py

@@ -180,6 +180,23 @@ def FluentExp(
     return get_environment().expression_manager.FluentExp(fluent, params)
 
 
+def InterpretedFunctionExp(
+    interpreted_function: "unified_planning.model.InterpretedFunction",
+    params: Sequence[Expression] = tuple(),  # -------
+) -> FNode:
+    """
+    | Creates an expression for the given ``interpreted_function`` and ``parameters``.
+    | Restriction: ``parameters type`` must be compatible with the ``InterpretedFunction`` :func:``signature <unified_planning.model.InterpretedFunction.signature>``
+
+    :param interpreted_function: The ``InterpretedFunction`` that will be set as the ``payload`` of this expression.
+    :param params: The Iterable of expressions acting as ``parameters`` for this ``InterpretedFunction``.
+    :return: The created ``InterpretedFunction`` Expression.
+    """
+    return get_environment().expression_manager.InterpretedFunction(
+        interpreted_function, params
+    )
+
+
 def Always(expression: BoolExpression) -> FNode:
     """
     Creates an expression of the form: