代码转载自：

https://blog.csdn.net/qq_36847641/article/details/78279309

链接为：

# -*- coding: utf-8 -*-
import sys
reload(sys)
sys.setdefaultencoding('utf-8')
# @Author: Chi Yu
# @Date:   2018-07-02 16:23:44
# @Last Modified by:   appleyuchi
# @Last Modified time: 2018-07-02 16:45:36
from sklearn.feature_extraction import DictVectorizer  
measurements = [  
    {'city': 'Dubai', 'temperature': 33.},  
     {'city': 'London', 'temperature': 12.},  
     {'city': 'San Fransisco', 'temperature': 18.},  
 ]  
print"类型是",type(measurements[0])#可以看到这是一个包含两个键的字典，一个字典中包含两个key-value对
print measurements[0]['city']
print measurements[0]['temperature']

# print"measurements=",measurements
vec = DictVectorizer()   
print(vec.fit_transform(measurements).toarray())
""" 
输出: 
array([[  1.,   0.,   0.,  33.], 
       [  0.,   1.,   0.,  12.], 
       [  0.,   0.,   1.,  18.]]) 
"""  
print(vec.get_feature_names())
""" 
输出： 
['city=Dubai', 'city=London', 'city=San Fransisco', 'temperature'] 
"""  

原表形式 

转换后形式