在python中按日期对csv对象进行排序 [英] Sorting a csv object by dates in python

问题描述

我正在尝试对具有类似数据的csv文件进行读取和排序

I am trying to read and sort a csv file that has data that looks like

Date    Open    High    Low Close   Volume
27-Mar-12   8.25    8.35    8.17    8.19    9801989
26-Mar-12   8.16    8.25    8.12    8.24    8694416
23-Mar-12   8.05    8.12    7.95    8.09    8149170

我这样做

import csv
data = csv.reader(open('data.csv','r'))

按日期对数据进行排序.我这样做:

To sort data by Date. I do:

sorteddata = sorted(data,key=operator.itemgetter(1),reverse=False)

问题是，它通过将日期读取为String而不是日期来对日期进行排序.因此，数据的排序方式如下，

The problem is, that it sorted the dates by reading them as String and not as dates. So the data is sorted like so,

['3-Aug-11', '7.06', '7.23', '6.84', '7.16', '31583617']
['3-Feb-12', '7.02', '7.12', '6.98', '7.08', '15318044']
['3-Jan-12', '5.53', '5.59', '5.44', '5.48', '12678923']
['3-Jun-11', '8.09', '8.17', '7.92', '7.97', '21273812']
['3-May-11', '9.00', '9.04', '8.63', '8.80', '17356005']

有人知道如何按日期排序吗?

Does anybody know how to sort by dates?

推荐答案

使用 datetime.strptime 从日期字段中获取datetime:

from datetime import datetime

data = sorted(data, key = lambda row: datetime.strptime(row[0], "%d-%b-%y"))

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