在使用Pandas进行数据处理的时候,我们通常从CSV或EXCEL中导入数据,但有的时候数据都存在数据库内,我们并没有现成的数据文件,这时候可以通过Pymongo这个库,从mongoDB中读取数据,然后载入到Pandas中,只需要简单的三步。
第一步,导入相关的模块:
import pymongoimport pandas as pd
第二步,设置MongoDB连接信息:
client = pymongo.MongoClient('localhost',27017)db = client['Lottery']pk10 = db['Pk10']
第三步,加载数据到Pandas中:
data = pd.DataFrame(list(pk10.find()))
删除mongodb中的_id字段
del data['_id']
选择需要显示的字段
data = data[['date','num1','num10']]print(data)
这样就可以轻松地从MongoDB中读取数据到Pandas中进行数据分析了。
stackoverflow
import pandas as pdfrom pymongo import MongoClientdef _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 = MongoClient(mongo_uri) else: conn = MongoClient(host, port) return conn[db]def read_mongo(db, collection, query={}, host='localhost', 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) # Expand the cursor and construct the DataFrame df = pd.DataFrame(list(cursor)) # Delete the _id if no_id: del df['_id'] return df