def as_list(arg):
    """Coerces arg into a list. If arg is already list-like, returns arg.
    Otherwise, returns a one-element list containing arg.

    :rtype: list
    """
    if _is_list(arg):
        return arg
    return [arg]
Coerces arg into a list. If arg is already list-like, returns arg.
    Otherwise, returns a one-element list containing arg.

    :rtype: list
    
googlemaps/convert.py