Function _idval

src/_pytest/python.py:1363–1403

(
    val: object,
    argname: str,
    idx: int,
    idfn: Optional[Callable[[Any], Optional[object]]],
    nodeid: Optional[str],
    config: Optional[Config],
)

def _idval(
    val: object,
    argname: str,
    idx: int,
    idfn: Optional[Callable[[Any], Optional[object]]],
    nodeid: Optional[str],
    config: Optional[Config],
) -> str:
    if idfn:
        try:
            generated_id = idfn(val)
            if generated_id is not None:
                val = generated_id
        except Exception as e:
            prefix = f"{nodeid}: " if nodeid is not None else ""
            msg = "error raised while trying to determine id of parameter '{}' at position {}"
            msg = prefix + msg.format(argname, idx)
            raise ValueError(msg) from e
    elif config:
        hook_id: Optional[str] = config.hook.pytest_make_parametrize_id(
            config=config, val=val, argname=argname
        )
        if hook_id:
            return hook_id

    if isinstance(val, STRING_TYPES):
        return _ascii_escaped_by_config(val, config)
    elif val is None or isinstance(val, (float, int, bool, complex)):
        return str(val)
    elif isinstance(val, Pattern):
        return ascii_escaped(val.pattern)
    elif val is NOTSET:
        # Fallback to default. Note that NOTSET is an enum.Enum.
        pass
    elif isinstance(val, enum.Enum):
        return str(val)
    elif isinstance(getattr(val, "__name__", None), str):
        # Name of a class, function, module, etc.
        name: str = getattr(val, "__name__")
        return name
    return str(argname) + str(idx)


def _idvalset(