Python - 将昨天的日期作为YYYY-MM-DD格式的字符串获取

Question

作为API请求的输入,我需要将昨天的日期作为格式的字符串YYYY-MM-DD.我有一个工作版本:

yesterday = datetime.date.fromordinal(datetime.date.today().toordinal()-1)
report_date = str(yesterday.year) + \
   ('-' if len(str(yesterday.month)) == 2 else '-0') + str(yesterday.month) + \
   ('-' if len(str(yesterday.day)) == 2 else '-0') + str(yesterday.day)

必须有一种更优雅的方式来做到这一点,对教育目的感兴趣,就像其他任何事情一样!

Answer 1

你只需要从今天的日期减去一天.datetime.timedelta(1)会告诉你一个持续时间为一天的timedelta物体,它可以从datetime物体中减去.然后,您可以使用datetime.strftimeorer将日期对象转换为基于您所期望的格式的字符串:

>>> from datetime import datetime, timedelta
>>> datetime.strftime(datetime.now() - timedelta(1), '%Y-%m-%d')
'2015-05-26'

请注意datetime.strftime,您也可以直接使用对象的strftime方法,而不是调用函数datetime:

>>> (datetime.now() - timedelta(1)).strftime('%Y-%m-%d')
'2015-05-26'

Answer 2

An alternative answer that uses today() method to calculate current date and then subtracts one using timedelta(). Rest of the steps remain the same.

https://docs.python.org/3.7/library/datetime.html#timedelta-objects

from datetime import date, timedelta
today = date.today()
yesterday = today - timedelta(days = 1)
print(today)
print(yesterday)

Output: 
2019-06-14
2019-06-13

Answer 3

>>> import datetime
>>> datetime.date.fromordinal(datetime.date.today().toordinal()-1).strftime("%F")
'2015-05-26'

Answer 4

调用.isoformat()一个date对象会给你YYYY-MM-DD

from datetime import date, timedelta
(date.today() - timedelta(1)).isoformat()