def get_previous_item(lst, item):
    """ Given an item, find its previous item in the list
        If the item appears more than once in the list, return the first index

        Args:
            lst: the list to search
            item: the item we want to find the previous item for

        Returns: The previous item or None if not found.
    """
    try:
        i = lst.index(item)
        if i > 0:
            return lst[i - 1]
    except (IndexError, ValueError):
        pass
    return None
