from typing import Union
from typing import Tuple
from typing import Any
from typing import List


def check_list(variable: Union[str, Tuple[Any], List[Any]]) -> list:
    """Convert argument variable into a list.

    :param variable: object to convert into a list
    :type: str tuple list
    :returns: list object of argument variable
    :rtype: list
    """
    if isinstance(variable, str):
        return [variable]
    if isinstance(variable, tuple):
        return list(variable)
    return variable