今天在用dataframe用到的方法

• 1.取某列某个范围内的数据
  data_total = data_total[(data_total['inTime'] > np.datetime64(date_begin)) & (data_total['inTime'] < np.datetime64(date_end))]
• 2.按某列统计数据

   dh = dh['enterprise_id'].sum()
   dh = dh['enterprise_id'].count()

• 3.遍历dataframe
  for index,item in pd.iterrows():
• 4.时间截取年与日

for index,item in pd.iterrows():
        date = item[9].date()