ExternalFunction
ExternalFunction[sys,"f"] represents an external function named "f" defined in the external evaluator sys.
ExternalFunction[session,"f"]represents an external function "f" in the specified ExternalSessionObject.ExternalFunction[sys,"code"]represents an external function defined by the code fragment "code".ExternalFunction[obj,"method"]represents a method bound to the ExternalObject.
Examples
(* Create an external function from Python code *)
pyAdd = ExternalFunction["Python", "lambda x, y: x + y"];
pyAdd[3, 5]
(* Use a named Python function *)
pyLen = ExternalFunction["Python", "len"];
pyLen["hello"]Please visit the official Wolfram Language Reference for more details.