为什么我的for循环在我的python索引生成器中跳过某些值？

I am writing a python search engine that reads a list of jokes, tokenizes the words, creates an index (key:words,values:document ids of the document(s) the word appears in, and then searches the index. The tokenization and search methods work fine, but my indexing method is giving me issues and I can't figure out why.I am writing a python search engine that reads