Python HTML解析，提供漂亮的汤和过滤停用词

import urllib2import BeautifulSoupimport stringbadwords = set([    'cup','cups',    'clove','cloves',    'tsp','teaspoon','teaspoons',    'tbsp','tablespoon','tablespoons',    'minced'])def cleanIngred(s):    # remove leading and trailing whitespace    s = s.strip()    # remove numbers and punctuation in the string    s = s.strip(string.digits + string.punctuation)    # remove unwanted words    return ' '.join(word for word in s.split() if not word in badwords)def main():    url = "http://allrecipes.com/Recipe/Slow-Cooker-Pork-Chops-II/Detail.aspx"    data = urllib2.urlopen(url).read()    bs = BeautifulSoup.BeautifulSoup(data)    ingreds = bs.find('div', {'class': 'ingredients'})    ingreds = [cleanIngred(s.getText()) for s in ingreds.findAll('li')]    fname = 'PorkRecipe.txt'    with open(fname, 'w') as outf:        outf.write('n'.join(ingreds))if __name__=="__main__":    main()

结果是

olive oilchicken brothgarlic,paprikagarlic powderpoultry seasoningdried oreganodried basilthick cut boneless pork chopssalt and pepper to taste

？我不知道为什么它在其中留下了逗号-s.strip（string.punctuation）应该已经解决了。