pathwaycom/pathway · error · TypeError

Got unexpected keyword arguments: {unexpected_arg_names}

Error message

Got unexpected keyword arguments: {unexpected_arg_names}

What it means

Error "Got unexpected keyword arguments: {unexpected_arg_names}" thrown in pathwaycom/pathway.

Source

Thrown at python/pathway/io/_utils.py:169

def check_deprecated_kwargs(
    kwargs: dict[str, Any], deprecated_kwarg_names: list[str], stacklevel: int = 2
):
    for kwarg_name in deprecated_kwarg_names:
        if kwarg_name in kwargs:
            warnings.warn(
                f"'{kwarg_name}' is deprecated and will be ignored",
                DeprecationWarning,
                stacklevel=stacklevel + 1,
            )
            kwargs.pop(kwarg_name)
    deprecated_kwargs_with_custom_report = ["persistent_id"]
    unexpected_args_list = []
    for kwarg in kwargs.keys():
        if kwarg not in deprecated_kwargs_with_custom_report:
            unexpected_args_list.append(kwarg)
    if unexpected_args_list:
        unexpected_arg_names = ", ".join(repr(arg) for arg in unexpected_args_list)
        raise TypeError(f"Got unexpected keyword arguments: {unexpected_arg_names}")


def internal_connector_mode(mode: str | api.ConnectorMode) -> api.ConnectorMode:
    if isinstance(mode, api.ConnectorMode):
        return mode
    internal_mode = _INPUT_MODES_MAPPING.get(mode)
    if not internal_mode:
        raise ValueError(
            "Unknown mode: {}. Only {} are supported".format(
                mode, ", ".join(_INPUT_MODES_MAPPING.keys())
            )
        )

    return internal_mode


def internal_read_method(format: str) -> ReadMethod:
    if format in (

View on GitHub (pinned to fa2f74a464)

Solutions

1. Remove the unexpected keyword arguments or fix their spelling; check the connector's documentation for the accepted parameter names.

Example fix

pw.io.fs.read(path, format='json', schema=MySchema)  # removed the unknown kwarg

When it happens

Trigger: Thrown at python/pathway/io/_utils.py:169 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of pathwaycom/pathway@fa2f74a464 (2026-08-15). Data as JSON: /api/errors/588d1d857defb63d. Report an issue: GitHub.