feat: Support positional arguments

Resolves: flyteorg/flyte#5320
Signed-off-by: Chi-Sheng Liu <chishengliu@chishengliu.com>

flytekit/core/interface.py

@@ -52,8 +52,8 @@ class Interface(object):
 
     def __init__(
         self,
-        inputs: Union[Optional[Dict[str, Type]], Optional[Dict[str, Tuple[Type, Any]]]] = None,
-        outputs: Union[Optional[Dict[str, Type]], Optional[Dict[str, Optional[Type]]]] = None,
+        inputs: Union[OrderedDict[str, Type], OrderedDict[str, Tuple[Type, Any]], None] = None,
+        outputs: Optional[OrderedDict[str, Optional[Type]]] = None,
         output_tuple_name: Optional[str] = None,
         docstring: Optional[Docstring] = None,
     ):
@@ -67,14 +67,14 @@ def __init__(
             primarily used when handling one-element NamedTuples.
         :param docstring: Docstring of the annotated @task or @workflow from which the interface derives from.
         """
-        self._inputs: Union[Dict[str, Tuple[Type, Any]], Dict[str, Type]] = {}  # type: ignore
+        self._inputs: Union[OrderedDict[str, Tuple[Type, Any]], OrderedDict[str, Type]] = OrderedDict()  # type: ignore
         if inputs:
             for k, v in inputs.items():
                 if type(v) is tuple and len(cast(Tuple, v)) > 1:
                     self._inputs[k] = v  # type: ignore
                 else:
                     self._inputs[k] = (v, None)  # type: ignore
-        self._outputs = outputs if outputs else {}  # type: ignore
+        self._outputs = outputs if outputs else OrderedDict()  # type: ignore
         self._output_tuple_name = output_tuple_name
 
         if outputs:
@@ -123,8 +123,8 @@ def output_tuple_name(self) -> Optional[str]:
         return self._output_tuple_name
 
     @property
-    def inputs(self) -> Dict[str, type]:
-        r = {}
+    def inputs(self) -> OrderedDict[str, type]:
+        r = OrderedDict()
         for k, v in self._inputs.items():
             r[k] = v[0]
         return r
@@ -375,7 +375,7 @@ def transform_function_to_interface(fn: typing.Callable, docstring: Optional[Doc
     outputs = extract_return_annotation(return_annotation)
     for k, v in outputs.items():
         outputs[k] = v  # type: ignore
-    inputs: Dict[str, Tuple[Type, Any]] = OrderedDict()
+    inputs: OrderedDict[str, Tuple[Type, Any]] = OrderedDict()
     for k, v in signature.parameters.items():  # type: ignore
         annotation = type_hints.get(k, None)
         default = v.default if v.default is not inspect.Parameter.empty else None
@@ -446,7 +446,7 @@ def output_name_generator(length: int) -> Generator[str, None, None]:
         yield default_output_name(x)
 
 
-def extract_return_annotation(return_annotation: Union[Type, Tuple, None]) -> Dict[str, Type]:
+def extract_return_annotation(return_annotation: Union[Type, Tuple, None]) -> OrderedDict[str, Type]:
     """
     The purpose of this function is to sort out whether a function is returning one thing, or multiple things, and to
     name the outputs accordingly, either by using our default name function, or from a typing.NamedTuple.
@@ -481,7 +481,7 @@ def t(a: int, b: str) -> Dict[str, int]: ...
     # Handle Option 6
     # We can think about whether we should add a default output name with type None in the future.
     if return_annotation in (None, type(None), inspect.Signature.empty):
-        return {}
+        return OrderedDict()
 
     # This statement results in true for typing.Namedtuple, single and void return types, so this
     # handles Options 1, 2. Even though NamedTuple for us is multi-valued, it's a single value for Python
@@ -491,7 +491,7 @@ def t(a: int, b: str) -> Dict[str, int]: ...
         bases = return_annotation.__bases__  # type: ignore
         if len(bases) == 1 and bases[0] == tuple and hasattr(return_annotation, "_fields"):
             logger.debug(f"Task returns named tuple {return_annotation}")
-            return dict(get_type_hints(cast(Type, return_annotation), include_extras=True))
+            return OrderedDict(get_type_hints(cast(Type, return_annotation), include_extras=True))
 
     if hasattr(return_annotation, "__origin__") and return_annotation.__origin__ is tuple:  # type: ignore
         # Handle option 3
@@ -511,7 +511,7 @@ def t(a: int, b: str) -> Dict[str, int]: ...
     else:
         # Handle all other single return types
         logger.debug(f"Task returns unnamed native tuple {return_annotation}")
-        return {default_output_name(): cast(Type, return_annotation)}
+        return OrderedDict([(default_output_name(), cast(Type, return_annotation))])
 
 
 def remap_shared_output_descriptions(output_descriptions: Dict[str, str], outputs: Dict[str, Type]) -> Dict[str, str]:

flytekit/core/promise.py

@@ -1202,19 +1202,22 @@ def flyte_entity_call_handler(
     #. Start a local execution - This means that we're not already in a local workflow execution, which means that
        we should expect inputs to be native Python values and that we should return Python native values.
     """
-    # Sanity checks
-    # Only keyword args allowed
-    if len(args) > 0:
-        raise _user_exceptions.FlyteAssertion(
-            f"When calling tasks, only keyword args are supported. "
-            f"Aborting execution as detected {len(args)} positional args {args}"
-        )
     # Make sure arguments are part of interface
     for k, v in kwargs.items():
-        if k not in cast(SupportsNodeCreation, entity).python_interface.inputs:
-            raise AssertionError(
-                f"Received unexpected keyword argument '{k}' in function '{cast(SupportsNodeCreation, entity).name}'"
-            )
+        if k not in entity.python_interface.inputs:
+            raise AssertionError(f"Received unexpected keyword argument '{k}' in function '{entity.name}'")
+
+    # Check if we have more arguments than expected
+    if len(args) > len(entity.python_interface.inputs):
+        raise AssertionError(
+            f"Received more arguments than expected in function '{entity.name}'. Expected {len(entity.python_interface.inputs)} but got {len(args)}"
+        )
+
+    # Convert args to kwargs
+    for arg, input_name in zip(args, entity.python_interface.inputs.keys()):
+        if input_name in kwargs:
+            raise AssertionError(f"Got multiple values for argument '{input_name}' in function '{entity.name}'")
+        kwargs[input_name] = arg
 
     ctx = FlyteContextManager.current_context()
     if ctx.execution_state and (
@@ -1234,15 +1237,12 @@ def flyte_entity_call_handler(
                 child_ctx.execution_state
                 and child_ctx.execution_state.branch_eval_mode == BranchEvalMode.BRANCH_SKIPPED
             ):
-                if (
-                    len(cast(SupportsNodeCreation, entity).python_interface.inputs) > 0
-                    or len(cast(SupportsNodeCreation, entity).python_interface.outputs) > 0
-                ):
-                    output_names = list(cast(SupportsNodeCreation, entity).python_interface.outputs.keys())
+                if len(entity.python_interface.inputs) > 0 or len(entity.python_interface.outputs) > 0:
+                    output_names = list(entity.python_interface.outputs.keys())
                     if len(output_names) == 0:
                         return VoidPromise(entity.name)
                     vals = [Promise(var, None) for var in output_names]
-                    return create_task_output(vals, cast(SupportsNodeCreation, entity).python_interface)
+                    return create_task_output(vals, entity.python_interface)
                 else:
                     return None
             return cast(LocallyExecutable, entity).local_execute(ctx, **kwargs)
@@ -1255,7 +1255,7 @@ def flyte_entity_call_handler(
             cast(ExecutionParameters, child_ctx.user_space_params)._decks = []
             result = cast(LocallyExecutable, entity).local_execute(child_ctx, **kwargs)
 
-        expected_outputs = len(cast(SupportsNodeCreation, entity).python_interface.outputs)
+        expected_outputs = len(entity.python_interface.outputs)
         if expected_outputs == 0:
             if result is None or isinstance(result, VoidPromise):
                 return None
@@ -1268,10 +1268,10 @@ def flyte_entity_call_handler(
         if (1 < expected_outputs == len(cast(Tuple[Promise], result))) or (
             result is not None and expected_outputs == 1
         ):
-            return create_native_named_tuple(ctx, result, cast(SupportsNodeCreation, entity).python_interface)
+            return create_native_named_tuple(ctx, result, entity.python_interface)
 
         raise AssertionError(
             f"Expected outputs and actual outputs do not match."
             f"Result {result}. "
-            f"Python interface: {cast(SupportsNodeCreation, entity).python_interface}"
+            f"Python interface: {entity.python_interface}"
         )