我想使用 for 循環獲取開始日期和結束日期之間范圍的唯一 yyyy-mm-01 列表。這是我的代碼：import datetimefrom datetime import timedelta, datestart=date(2017,4,1)end=(datetime.date.today().replace(day=1)) - datetime.timedelta(days=1) #last completed monthdef daterange(start, end): for n in range(int((end - start).days)): yield start + timedelta(n)for single_date in daterange(start, end): myset = str(single_date.strftime("%Y-%m-01")) print(myset)The issue is that my result looks like this:2017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-04-012017-05-01我嘗試添加 set() 但它仍然顯示冗余日期。我該如何解決？
4 回答
12345678_0001
TA貢獻1802條經驗 獲得超5個贊
dates = set()
for single_date in daterange(start, end):
dates.add(single_date.strftime("%Y-%m-01"))
print(sorted(list(dates)))
夢里花落0921
TA貢獻1772條經驗 獲得超6個贊
import datetime
from datetime import timedelta, date
from dateutil.relativedelta import relativedelta
start=date(2017,4,1)
end=(datetime.date.today().replace(day=1)) - datetime.timedelta(days=1) #last completed month
lst = []
current_date = start
while current_date < end:
current_date = current_date.replace(day=1) + relativedelta(months=1)
lst.append(current_date)
print(lst)
牧羊人nacy
TA貢獻1862條經驗 獲得超7個贊
問題是你實際上并沒有使用你的集合來檢查你之前是否見過一個日期：
myset = set()
for single_date in daterange(start, end):
mydate = str(single_date.strftime("%Y-%m-01"))
if mydate not in myset:
print(mydate)
myset.add(mydate)
慕斯709654
TA貢獻1840條經驗 獲得超5個贊
我強烈建議您使用dateutils模塊來獲取這樣的重復日期。您可以使用cmd安裝它pip install python-dateutil
>>> from dateutil.rrule import rrule, MONTHLY
>>>
>>> start=date(2017,4,1)
>>> end=(datetime.date.today().replace(day=1)) - datetime.timedelta(days=1)
>>> res = list(d.strftime("%Y-%m-%d") for d in rrule(dtstart=start, until=end, freq=MONTHLY))
>>> pprint(res)
['2017-04-01',
'2017-05-01',
'2017-06-01',
'2017-07-01',
'2017-08-01',
'2017-09-01',
'2017-10-01',
'2017-11-01',
'2017-12-01',
'2018-01-01',
'2018-02-01',
'2018-03-01',
'2018-04-01',
'2018-05-01',
'2018-06-01',
'2018-07-01',
'2018-08-01',
'2018-09-01',
'2018-10-01',
'2018-11-01',
'2018-12-01',
'2019-01-01',
'2019-02-01',
'2019-03-01',
'2019-04-01',
'2019-05-01',
'2019-06-01',
'2019-07-01',
'2019-08-01',
'2019-09-01',
'2019-10-01',
'2019-11-01',
'2019-12-01',
'2020-01-01',
'2020-02-01',
'2020-03-01',
'2020-04-01',
'2020-05-01',
'2020-06-01',
'2020-07-01']
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