python - Python获取上个月和一年(Python get last month and year)

Question

I am trying to get last month and current year in the format: July 2016.

(我正在尝试以2016年7月的格式获取上个月和本年度。)

I have tried (but that didn't work) and it does not print July but the number:

(我试过了（但是那没用），它不会打印七月，但是会打印数字：)

import datetime
now = datetime.datetime.now()
print now.year, now.month(-1)

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Answer 1

If you're manipulating dates then the dateutil library is always a great one to have handy for things the Python stdlib doesn't cover easily.

(如果您要处理日期，那么dateutil库始终是一个很好的工具，可以方便地处理Python stdlib难以涵盖的内容。)

First, install the dateutil library if you haven't already:

(首先，如果尚未安装dateutil库，请执行dateutil ：)

pip install python-dateutil

Next:

(下一个：)

from datetime import datetime
from dateutil.relativedelta import relativedelta

# Returns the same day of last month if possible otherwise end of month
# (eg: March 31st->29th Feb an July 31st->June 30th)
last_month = datetime.now() - relativedelta(months=1)

# Create string of month name and year...
text = format(last_month, '%B %Y')

Gives you:

(给你：)

'July 2016'