上个月的python日期 [英] python date of the previous month

问题描述

我试图用python来获取上个月的日期。
这是我试过的：

I am trying to get the date of the previous month with python. Here is what i've tried:

str( time.strftime('%Y') ) + str( int(time.strftime('%m'))-1 )

然而，这样做有两个原因：首先它返回20122年2012年2月（而不是201202），其次它将返回0而不是12月1月。

However, this way is bad for 2 reasons: First it returns 20122 for the February of 2012 (instead of 201202) and secondly it will return 0 instead of 12 on January.

我已经解决了echo $（date -d3个月前+％G％m％d）

I have solved this trouble in bash with

echo $(date -d"3 month ago" "+%G%m%d")

我认为，如果bash有一个内置的方式为此目的，那么python，应该提供比强制编写自己的脚本来实现这个目标更好的东西。当然我可以这样做：

I think that if bash has a built-in way for this purpose, then python, much more equipped, should provide something better than forcing writing one's own script to achieve this goal. Of course i could do something like:

if int(time.strftime('%m')) == 1:
    return '12'
else:
    if int(time.strftime('%m')) < 10:
        return '0'+str(time.strftime('%m')-1)
    else:
        return str(time.strftime('%m') -1)

我没有测试这段代码，我不想使用它（除非我可以'感谢您的帮助！

I have not tested this code and i don't want to use it anyway (unless I can't find any other way:/)

推荐答案

可以找到任何其他方式：/ /

解决方案

datetime ，datetime.timedelta类是您的朋友。

datetime and the datetime.timedelta classes are your friend.

1. 今天查询


2. 使用它来查找本月的第一天。



3. 打印您要查找的YYYYMM字符串。

1. find today.
2. use that to find the first day of this month.
3. use timedelta to backup a single day, to the last day of the previous month.
4. print the YYYYMM string you're looking for.

像这样：

 >>> import datetime
 >>> today = datetime.date.today()
 >>> first = today.replace(day=1)
 >>> lastMonth = first - datetime.timedelta(days=1)
 >>> print lastMonth.strftime("%Y%m")
 201202
 >>>

这篇关于上个月的python日期的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！