Pandas数据操作

一、读写数据

import pandas as pddf = pd.read_csv('data.csv')df.to_csv('data2.csv')

二、查询数据

df[df['userid']=123]

<pre name="code" class="python">df3 = pd.merge(df1,df2,on='id')​

df.groupby(['userid','city']).size().reset_index(name='size')