Python访问MongoDB，并且转换成Dataframe

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2018/7/13 11:10
# @Author  : baoshan
# @Site    :
# @File    : pandans_pymongo.py
# @Software: PyCharm Community Edition

import pymongo
import pandas as pd

def _connect_mongo(host, port, username, password, db):
    """ A util for making a connection to mongo. """
    if username and password:
        mongo_uri = "mongodb://%s:%s@%s:%s/%s" % (username, password, host, port, db)
        conn = pymongo.MongoClient(mongo_uri)
    else:
        conn = pymongo.MongoClient(host, port)

    return conn[db]

def read_mongo(db, collection, query={}, host='test43', port=27017, username=None, password=None, no_id=True):
    """ Read from Mongo and Store into DataFrame. """

    # Connect to MongoDB
    db = _connect_mongo(host=host, port=port, username=username, password=password, db=db)

    # Make a query to the specific DB and Collection
    cursor = db[collection].find(query).limit(10)

    # Expand the cursor and construct the DataFrame
    df = pd.DataFrame(list(cursor))
    df.to_csv("abc.csv", encoding="utf_8_sig")  # 处理中文乱码问题

    if no_id:
        del df['_id']

    return df

read_mongo(db='service', collection='trace_log_regular', query={}, host='xxx', port=27017, username="xxx", password="xxx")

小结：

1. 解决了pymongo访问MongoDB的问题

2. 解决了查询的数据转成dataframe的问题

3. 解决了dataframe写入到csv的问题

4. 解决了中文乱码问题。

谢谢

【参考】https://stackoverflow.com/questions/16249736/how-to-import-data-from-mongodb-to-pandas