import jieba
import jieba.analyse
 
def words2vec(words1=None, words2=None):
  v1 = []
  v2 = []
  tag1 = jieba.analyse.extract_tags(words1, withWeight=True)
  tag2 = jieba.analyse.extract_tags(words2, withWeight=True)
  tag_dict1 = {i[0]: i[1] for i in tag1}
  tag_dict2 = {i[0]: i[1] for i in tag2}
  merged_tag = set(tag_dict1.keys()) | set(tag_dict2.keys())
  for i in merged_tag:
    if i in tag_dict1:
      v1.append(tag_dict1[i])
    else:
      v1.append(0)
    if i in tag_dict2:
      v2.append(tag_dict2[i])
    else:
      v2.append(0)
  return v1, v2
 
 
def cosine_similarity(vector1, vector2):
  dot_product = 0.0
  normA = 0.0
  normB = 0.0
  for a, b in zip(vector1, vector2):
    dot_product += a * b
    normA += a ** 2
    normB += b ** 2
  if normA == 0.0 or normB == 0.0:
    return 0
  else:
    return round(dot_product / ((normA**0.5)*(normB**0.5)) * 100, 2)
   
def cosine(str1, str2):
  vec1, vec2 = words2vec(str1, str2)
  return cosine_similarity(vec1, vec2)
 
print(cosine('阿克苏苹果', '阿克苏苹果'))