import pandas as pd
import numpy as np
data = pd.read_csv('C:\\Users\\1701\Desktop\\data.csv',index_col = False)
data['RecTm'] = pd.to_datetime(data['time'])#time表示代表时间的那一列列名
data.set_index('RecTm',inplace = True)#把时间列作为索引
ticks = data.ix[:]
bars = ticks.resample('30min').sum()#切分
bars.to_csv('C:\\Users\\1701\Desktop\\000.csv') #保存