倒排索引一般用在你已经知道有些值，你想返回去去找到对应的关系就可以用这种方法，其实就是一个字典反过来查找
def false_index(index_set):
all_words = []
for i in index_set.values():
cut = i.split()
all_words.extend(cut)
# set_all_words = set(all_words)
# 构建倒排索引
invert_index = dict()
for b in all_words:
temp = []
for j in index_set.keys():
field = index_set[j]
split_field = field.split()
if b in split_field:
temp.append(j)
invert_index[b] = temp
return invert_index
false=false_index({'特色小吃': "煎饼果子 串串 包子", '好玩地点': "天府五街 天府三街 软件院"})
print(false)
print(---------------------------------------------)
print(false['天府五街'])
{‘煎饼果子’: [‘特色小吃’], ‘串串’: [‘特色小吃’], ‘包子’: [‘特色小吃’], ‘天府五街’: [‘好玩地点’], ‘天府三街’: [‘好玩地点’], ‘软件院’: [‘好玩地点’]}
[‘好玩地点’]
