def list_and_add(a, b):
    """
    Concatenate anything into a list.

    Args:
        a: the first thing
        b: the second thing

    Returns:
        list. All the things in a list.
    """
    if not isinstance(b, list):
        b = [b]
    if not isinstance(a, list):
        a = [a]
    return a + b
Concatenate anything into a list.

    Args:
        a: the first thing
        b: the second thing

    Returns:
        list. All the things in a list.