摘要：Define the function twonums_sum(n, lst), finds in the list lst whether there is a sum of two numbers equal to n, if any, returns a subscript of two nu 阅读全文

摘要：Enter an English sentence. Except for words and spaces, the sentence contains only punctuation ",", ".", "'", "", and "!". Count the times of each wor 阅读全文

摘要：File artical.txt contains an article in English (please create the file by yourself and put any English article you picked in it). Assume the article 阅读全文