def find_list_index(a_list, item):
    """
    Finds the index of an item in a list.

    :param a_list: A list to find the index in.
    :type a_list: list
    :param item: The item to find the index for.
    :type item: str
    :return: The index of the item, or None if not in the list.
    :rtype: int | None
    """
    if item in a_list:
        for i, value in enumerate(a_list):
            if value == item:
                return i