`call_method` and `uamethod` unpack tuple type about opcua-asyncio HOT 4 CLOSED

In OPC UA there are no tuples. But OPC UA allows multiple return values of a Method. So we unpack a tupple as return values. And if there is only one return value, we return the value instead an array of return values.

from opcua-asyncio.

Ok, but why is the behaviour for lists different? For example the same code with a list instead of a tuple:

@uamethod
def put_into_list(parent, input: str) -> list[str]:
    return [input]
    
def test_list_behaviour(client, idx):
    expected_result = ["test"]
    res = client.nodes.objects.call_method(f"{idx}:put_into_list", "test")
    assert res == expected_result

# Passed: ["test"] == ["test"]

This works as expected, returning a list with a single element, but a tuple is unpacked into a single element.

from opcua-asyncio.

Because in OPC UA you can return an OPC UA Array which is a list or chained lists, so there is no reason to convert it.

from opcua-asyncio.

Ok, this was not was I was expecting. So the expected behaviour is?

Input: Tuple with 1 item -> Output: Item (without List or Tuple)
Input: List with 1 item -> Output: List with 1 item

Input: Tuple with 2 items -> Output: List with 2 items
Input: List with 2 items -> Output: List with 2 items

from opcua-asyncio.