Next, copy in your strip_punctuation function and define a function called get_pos which takes one parameter, a string which represents one or more sentences, and calculates how many words in the string are considered positive words. Use the list, positive_words to determine what words will count as positive. The function should return a positive integer - how many occurrences there are of positive words in the text. Note that all of the words in positive_words are lower cased, so you’ll need to convert all the words in the input string to lower case as well. punctuation_chars = ["", ","," 3 # list of positive words to use 4 positive_words = 0 5 with open ("positive_words. txt") as pos_f: for lin in pos_f: if lin[0] != ';' and lin[0] != '\n': positive_words. append(lin. strip) 6 7 8 9 10