mongodb取出json，利用python转成dataframe（dict-to-dataframe）

import pandas as pd
from pymongo import MongoClient
#1. get data from mongodb
class extra_yunnan_hotel(object):
def get_yunnan_hotel(self):
client = MongoClient('192.168.1.XXX',27017)
db=client.gaode_pois
data2=db.gaode_pois_hotel_yunnan_extra_mid01.find({},{"_id":0,'name':1,'lng':1,'lat':1}).limit(10)
#创建一个空的dataframe
df = pd.DataFrame(columns = ["_id", "name", "lng", "lat"])
for x in data2:
#dict转成dataframe,注意.T的运用
pd_data=pd.DataFrame.from_dict(x,orient='index').T
#插入df,忽略索引
df=df.append(pd_data, ignore_index=True)
df.to_csv('_id_name_lng_lat2.csv',sep='\t',encoding='utf-8')

#执行
start=extra_yunnan_hotel()
start.get_yunnan_hotel()