经常会用到，比如过滤已生成过的关键词（包含关系），相等关系直接用编辑器去重就好，推荐编辑器notepad++、sublime；提取包含词根的关键词等等，不区分大小写
ok.txt，存放包含关键词的词根
key.txt，词根
keyword.txt，关键词
ok = open('ok.txt','w',encoding='utf8')
with open('keyword.txt',encoding="utf8") as wordlist:
for keyword in wordlist:
keyword = keyword.strip('\n')
# kw,kurl = keyword.split('\t')
with open('key.txt',encoding="utf8") as keylist:
for k in keylist:
k = k.strip('\n')
if k.upper() in keyword.upper():
ok.write(k+'\n')
break
