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[英]datetime : ValueError: day is out of range for month
[英]ValueError: day is out of range for month datetime
我在编写一些代码时遇到了问题。 我将四个输入(日、月和年)作为日期,以及他们想要重复任务的次数(例如,每周一持续 3 周)。 代码很棒,但是如果几个月之间的周数不同,我会收到此错误:
File "C:\Users\dansi\AppData\Local\Programs\Python\Python36-32\gui test 3.py", line 72, in addtimeslot
fulldateadd = datetime.date(year, month, day)
ValueError: day is out of range for month
相关的部分代码:
for i in range(0 , times):
fulldateadd = datetime.date(year, month, day)
cursor.execute( '''INSERT INTO dates (Date, Name, Start, End) VALUES( ?,?,?,? );''', (fulldateadd , name1, starttimehour, endtimehour))
day = day + 7
if day > 31:
month = month + 1
当天数超过 31 时,我试图增加月份,但它似乎不起作用。
增加日期时间的组件然后创建一个新的组件不是一个好主意的原因有几个。 主要是因为您自己处理公历并不是那么令人愉快,恕我直言,日期时间对象可以为您完成。
在这一点上,一个更直接的方法是在循环中为您的日期时间添加一个时间增量。 例如,
>>> from datetime import timedelta
>>> times = 4
>>> cur_date = datetime.date(2017, 2, 24)
>>> for _ in range(times):
print('today is {0}, do something'.format(cur_date))
cur_date += timedelta(days=7)
today is 2017-02-24, do something
today is 2017-03-03, do something
today is 2017-03-10, do something
today is 2017-03-17, do something
这也可以放置在生成器中,具体取决于您的用例。
>>> for dt in (cur_date + timedelta(days=x*7) for x in range(times)):
print('today is {0}, do something'.format(dt))
today is 2017-02-24, do something
today is 2017-03-03, do something
today is 2017-03-10, do something
today is 2017-03-17, do something
或使用 Pandas pd.date_range
>>> import pandas as pd
>>> list(pd.date_range(start='2017-02-24', periods=4, freq='7D'))
[Timestamp('2017-02-24 00:00:00', freq='7D'),
Timestamp('2017-03-03 00:00:00', freq='7D'),
Timestamp('2017-03-10 00:00:00', freq='7D'),
Timestamp('2017-03-17 00:00:00', freq='7D')]
现在如果你用你的方法尝试这个例子会发生什么?
>>> year, month, day = 2017, 2, 24
>>> for i in range(0 , times):
day = day
fulldateadd = datetime.date(year, month, day)
print('today is {0}, do something'.format(fulldateadd))
day = day + 7
if day > 31:
day = day - 31
month = month + 1
today is 2017-02-24, do something
ValueErrorTraceback (most recent call last)
<ipython-input-255-7df608ebbf8e> in <module>()
1 for i in range(0 , times):
2 day = day
----> 3 fulldateadd = datetime.date(year, month, day)
4 print('today is {0}, do something'.format(fulldateadd))
5 day = day + 7
ValueError: day is out of range for month
二月没有 31 天......所以你必须包含一个检查,并映射到每个月的天数。 包括闰年的逻辑。
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