Python–从年和工作日获取月份
给定一年和一个工作日，任务是编写一个 Python 程序来获得一个月和一周。
示例:
Input : test_year = 1997, test_week = 27
Output : 1997-07-07 00:00:00
Explanation : 27th Week starts from 7 july in 1997.
Input : test_year = 2021, test_week = 27
Output : 2021-07-05 00:00:00
Explanation : 27th Week starts from 5 july in 2021.
方法#1:使用%W、%w
用%W 解析日期会将我们设置为一周的开始，此外，%w 获取所需的工作日，我们将使用默认值 1。可以根据要求进行调整。
Python 3
# Python3 code to demonstrate working of
# Start week from year and weekday
# Using %W, %w
from datetime import datetime, timedelta
# initializing year
test_year = 1997
# initializing week
test_week = 27
# printing original date
print("The original year, week is : " + str(test_year) + " " + str(test_week))
date = str(test_year) + '-W' + str(test_week)
# getting date
res = datetime.strptime(date + '-1', "%Y-W%W-%w")
# printing result
print("The starting date of week : " + str(res))
输出:
The original year, week is : 1997 27
The starting date of week : 1997-07-07 00:00:00
方法 2:使用 relativedelta()
这只是将所需的周数添加到所需的年份中，并获得所需的初始日期。这增加了星期，因此可以根据一年的开始日期给出任何工作日。
Python 3
# Python3 code to demonstrate working of
# Start week from year and weekday
# Using relativedelta()
import datetime
from dateutil.relativedelta import relativedelta
# initializing year
test_year = 1997
# initializing week
test_week = 27
# printing original date
print("The original year, week is : " + str(test_year) + " " + str(test_week))
# contructing date
date = datetime.date(test_year, 1, 1)
# getting date by adding weeks to year beg.
# prints 9 July. as 1 jan was wednesday, 27th
# weeks beginning is from wed.
res = date + relativedelta(weeks = +test_week)
# printing result
print("The starting date of week : " + str(res))
输出:
The original year, week is : 1997 27
The starting date of week : 1997-07-09
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