def histogram(list_of_words):
    linked_list = LinkedList()
    for word in list_of_words:
        searched_word = linked_list.search_word(word)
        print(searched_word)
        if searched_word == "":
            tuple_val = (word, 0)
            linked_list.insert(tuple_val)
        else:
            pass
def histogram(list_of_words):
    linked_list = LinkedList()
    for word in list_of_words:
        try:
            searched_word = linked_list.search_word(word)
            tuple_val = (word, 0)
            linked_list.insert(tuple_val)
        except:
            if searched_word == word:
                new_count = 1  # supposed to add but not working
                linked_list.insert((word, new_count))
                linked_list.delete((word, 0))