How to find a substrings in string in two big csv file (python)

Question

I have two big csv files. The main one has a field as product name and in other csv file I have some keywords. I am looking for these keywords in product name in first CSV file. At the moment my code is like this:

class Keyword:
    # keyword class for adding match keywords
        def __init__(self):
          self.data={}
        def add(self, keyword, count):
          if keyword in self.data.keys():
            self.data[keyword]+=count
          else:
            self.data[keyword]=count
        def get_match(self):
           temp = []
           for key, value in self.data.iteritems():
              temp.append(key)
              temp.append(value)
           return temp

for i, product_row in product_df.iterrows():
    product_title = product_row['title'].lower().replace(',','')
    k = Keyword()
    for j, keyword_row in keyword_df.iterrows():
        if keyword_row['keyword'] in product_title:
           k.add(keyword_row['keyword'], keyword_row['count'])

    match_items = k.get_match()
    if len(match_items)>0:
        temp = product_row.tolist()
        temp = [str(x).replace(',','') for x in temp]
        temp.extend(match_items)
        print>>sys.stdout, str(temp).strip('[]').replace("'",'')
    else:
        pass

This code is extremely slow and I have many of these csv files that should get compare with each other. Do you know more efficient way to compare these files?

Answer 1

如果您的关键字实际上是单个单词，而不是多单词表达式，我的第一个建议是将产品标题转换为一组，以加快查找速度：

product_title = set(product_row['title'].lower().replace(',','').split())

Answer 2

Read the entire keyword file, store the keywords in a list. After that read your products fields and check if any of the keywords are in the field, if they are then print them.

with open("keywords.txt", "r") as f:
    keywords = f.read().splitlines()

with open("products.txt") as f:
    for product_name in f:
        if any(keyword in product_name for keyword in keywords):
            print product_name