如何用Python中的While回圈替換日期時間

from datetime import datetime
from datetime import timedelta

dateIs = datetime.today()
thisDay = datetime.strftime(dateIs, "%d")
thisDayInt = int(thisDay)
dateListTest = []
if(thisDayInt > 0):
    while thisDayInt > 1:
        thisDayInt -= 1
        dateIs.replace(day=thisDayInt,hour=0,minute=0,second=0)
        dateListTest.append(dateIs)
    
    print(dateListTest)

輸出

[datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371), 
datetime.datetime(2021, 11, 18, 23, 38, 23, 687371)] 

這部分我想要做的就是把從今天到月初的天數一一列出來，但是當我把它們放到While回圈中時，卻無法遞減列印這些天數。我不知道更短的路徑或我要跳過的地方。

uj5u.com熱心網友回復：

串列理解

您可以為此使用串列理解。

from datetime import datetime

dateIs = datetime.today().replace(hour=0, minute=0, second=0, microsecond=0)
thisDay = dateIs.day

dateListTest = [dateIs.replace(day=d) for d  in range(thisDay-1, 0, -1)]

print(dateListTest)

[datetime.datetime(2021, 11, 17, 0, 0), 
 datetime.datetime(2021, 11, 16, 0, 0), 
 datetime.datetime(2021, 11, 15, 0, 0), 
 datetime.datetime(2021, 11, 14, 0, 0), 
 datetime.datetime(2021, 11, 13, 0, 0), 
 datetime.datetime(2021, 11, 12, 0, 0), 
 datetime.datetime(2021, 11, 11, 0, 0), 
 datetime.datetime(2021, 11, 10, 0, 0), 
 datetime.datetime(2021, 11, 9, 0, 0), 
 datetime.datetime(2021, 11, 8, 0, 0), 
 datetime.datetime(2021, 11, 7, 0, 0), 
 datetime.datetime(2021, 11, 6, 0, 0), 
 datetime.datetime(2021, 11, 5, 0, 0), 
 datetime.datetime(2021, 11, 4, 0, 0), 
 datetime.datetime(2021, 11, 3, 0, 0), 
 datetime.datetime(2021, 11, 2, 0, 0), 
 datetime.datetime(2021, 11, 1, 0, 0)]

熊貓

你也可以用date_rangefrom來做Pandas，雖然你最終會得到一個 datetime.date 串列而不是 datetime.datetime。

from datetime import datetime
import pandas as pd

dateIs = datetime.today().replace(hour=0, minute=0, second=0, microsecond=0)
thisDay = dateIs.day

dateListTestPandas =pd.date_range(start=dateIs.replace(day=thisDay-1), end=dateIs.replace(day=1), freq="-1D").date.tolist()

print(dateListTestPandas)

[datetime.date(2021, 11, 17), 
 datetime.date(2021, 11, 16), 
 datetime.date(2021, 11, 15), 
 datetime.date(2021, 11, 14), 
 datetime.date(2021, 11, 13), 
 datetime.date(2021, 11, 12), 
 datetime.date(2021, 11, 11), 
 datetime.date(2021, 11, 10), 
 datetime.date(2021, 11, 9), 
 datetime.date(2021, 11, 8), 
 datetime.date(2021, 11, 7), 
 datetime.date(2021, 11, 6), 
 datetime.date(2021, 11, 5), 
 datetime.date(2021, 11, 4), 
 datetime.date(2021, 11, 3), 
 datetime.date(2021, 11, 2), 
 datetime.date(2021, 11, 1)]

標籤：Python 循环 约会时间 while 循环

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