我想找出以下内容:
给定一个日期(datetime
对象),一周的相应日期是什么。
例如星期日是第一天,星期一:第二天......依此类推
然后如果输入类似于今天的日期。
>>> today = datetime.datetime(2017, 10, 20)
>>> today.get_weekday() # what I look for
输出可能是6
(自星期五起)
答案 0 :(得分:718)
使用weekday()
(docs):
>>> import datetime
>>> datetime.datetime.today()
datetime.datetime(2012, 3, 23, 23, 24, 55, 173504)
>>> datetime.datetime.today().weekday()
4
来自文档:
以整数形式返回星期几,其中星期一为0,星期日为6。
答案 1 :(得分:230)
如果您希望以英文显示日期:
from datetime import date
import calendar
my_date = date.today()
calendar.day_name[my_date.weekday()] #'Wednesday'
答案 2 :(得分:40)
答案 3 :(得分:21)
我为codechef question解决了这个问题。
import datetime
dt = '21/03/2012'
day, month, year = (int(x) for x in dt.split('/'))
ans = datetime.date(year, month, day)
print ans.strftime("%A")
答案 4 :(得分:20)
在1700/1/1之后没有导入日期的解决方案
def weekDay(year, month, day):
offset = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334]
week = ['Sunday',
'Monday',
'Tuesday',
'Wednesday',
'Thursday',
'Friday',
'Saturday']
afterFeb = 1
if month > 2: afterFeb = 0
aux = year - 1700 - afterFeb
# dayOfWeek for 1700/1/1 = 5, Friday
dayOfWeek = 5
# partial sum of days betweem current date and 1700/1/1
dayOfWeek += (aux + afterFeb) * 365
# leap year correction
dayOfWeek += aux / 4 - aux / 100 + (aux + 100) / 400
# sum monthly and day offsets
dayOfWeek += offset[month - 1] + (day - 1)
dayOfWeek %= 7
return dayOfWeek, week[dayOfWeek]
print weekDay(2013, 6, 15) == (6, 'Saturday')
print weekDay(1969, 7, 20) == (0, 'Sunday')
print weekDay(1945, 4, 30) == (1, 'Monday')
print weekDay(1900, 1, 1) == (1, 'Monday')
print weekDay(1789, 7, 14) == (2, 'Tuesday')
答案 5 :(得分:20)
如果您想用英文写日期:
>>> from datetime import date
>>> datetime.datetime.today().strftime('%A')
'Wednesday'
了解更多: https://docs.python.org/2/library/datetime.html#strftime-strptime-behavior
答案 6 :(得分:10)
如果日期是日期时间对象,则此解决方案。
import datetime
def dow(date):
days=["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]
dayNumber=date.weekday()
print days[dayNumber]
答案 7 :(得分:9)
这是解决此问题的简单代码段
import datetime
intDay = datetime.date(year=2000, month=12, day=1).weekday()
days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
print(days[intDay])
输出应为:
Friday
答案 8 :(得分:8)
datetime库有时会出现strptime()错误,所以我切换到dateutil库。以下是如何使用它的示例:
from dateutil import parser
parser.parse('January 11, 2010').strftime("%a")
您从中获得的输出是'Mon'
。如果您希望输出为“Monday”,请使用以下命令:
parser.parse('January 11, 2010').strftime("%A")
这很快就适合我。我在使用日期时间库时遇到问题,因为我想存储工作日名称而不是工作日编号,而使用日期时间库的格式导致了问题。如果你没有遇到这个问题,太好了!如果你是,那么你可以无限期地使用它,因为它也有更简单的语法。希望这会有所帮助。
答案 9 :(得分:6)
假设您获得了日,月和年,您可以这样做:
import datetime
DayL = ['Mon','Tues','Wednes','Thurs','Fri','Satur','Sun']
date = DayL[datetime.date(year,month,day).weekday()] + 'day'
#Set day, month, year to your value
#Now, date is set as an actual day, not a number from 0 to 6.
print(date)
答案 10 :(得分:4)
如果您有理由避免使用datetime模块,那么此功能将起作用。
注意:假设从Julian到公历的变化发生在1582年。如果您感兴趣的日历不适用,则更改行,如果年份> 1582:因此。
def dow(year,month,day):
""" day of week, Sunday = 1, Saturday = 7
http://en.wikipedia.org/wiki/Zeller%27s_congruence """
m, q = month, day
if m == 1:
m = 13
year -= 1
elif m == 2:
m = 14
year -= 1
K = year % 100
J = year // 100
f = (q + int(13*(m + 1)/5.0) + K + int(K/4.0))
fg = f + int(J/4.0) - 2 * J
fj = f + 5 - J
if year > 1582:
h = fg % 7
else:
h = fj % 7
if h == 0:
h = 7
return h
答案 11 :(得分:4)
如果您不仅仅依赖datetime
模块,calendar
可能是更好的选择。例如,这将为您提供日期代码:
calendar.weekday(2017,12,22);
这会给你这一天:
days = ["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]
days[calendar.weekday(2017,12,22)]
或者以python的风格,作为一个班轮:
["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"][calendar.weekday(2017,12,22)]
答案 12 :(得分:3)
说您有 timeStamp:字符串变量,YYYY-MM-DD HH:MM:SS
第1步:将其转换为带有打击代码的dateTime函数...
df['timeStamp'] = pd.to_datetime(df['timeStamp'])
第2步:现在,您可以提取以下所有必需的功能,这将为每个小时,月,周日,年,日期创建新的列
df['Hour'] = df['timeStamp'].apply(lambda time: time.hour)
df['Month'] = df['timeStamp'].apply(lambda time: time.month)
df['Day of Week'] = df['timeStamp'].apply(lambda time: time.dayofweek)
df['Year'] = df['timeStamp'].apply(lambda t: t.year)
df['Date'] = df['timeStamp'].apply(lambda t: t.day)
答案 13 :(得分:3)
import datetime
import calendar
day, month, year = map(int, input().split())
my_date = datetime.date(year, month, day)
print(calendar.day_name[my_date.weekday()])
08 05 2015
Friday
答案 14 :(得分:2)
如果要生成一列具有日期范围(Date
)的列,并生成到第一个列并分配工作日(Week Day
)的列,请执行以下操作(I将使用从2008-01-01
到2020-02-01
的日期):
import pandas as pd
dr = pd.date_range(start='2008-01-01', end='2020-02-1')
df = pd.DataFrame()
df['Date'] = dr
df['Week Day'] = pd.to_datetime(dr).weekday
输出如下:
Week Day
的范围是0到6,其中0对应于星期一,而6则对应于星期日。
答案 15 :(得分:2)
我们可以帮助熊猫:
import pandas as pd
如上所述,在问题中,我们有:
datetime(2017, 10, 20)
如果在jupyter笔记本中执行此行,我们将得到如下输出:
datetime.datetime(2017, 10, 20, 0, 0)
使用平日()和平日名称:
如果您希望工作日为整数格式,请使用:
pd.to_datetime(datetime(2017, 10, 20)).weekday()
输出将是:
4
如果您希望将其用作星期天,星期一,星期五等日期的名称,则可以使用:
pd.to_datetime(datetime(2017, 10, 20)).weekday_name
输出将是:
'Friday'
如果熊猫数据框中包含日期列,则:
现在假设您的熊猫数据框的日期列如下所示: pdExampleDataFrame ['Dates']。head(5)
0 2010-04-01
1 2010-04-02
2 2010-04-03
3 2010-04-04
4 2010-04-05
Name: Dates, dtype: datetime64[ns]
现在,如果我们想知道星期一,星期二等的工作日名称,可以使用.weekday_name
,如下所示:
pdExampleDataFrame.head(5)['Dates'].dt.weekday_name
输出将是:
0 Thursday
1 Friday
2 Saturday
3 Sunday
4 Monday
Name: Dates, dtype: object
如果我们想从“日期”列中获取工作日的整数,则可以使用:
pdExampleDataFrame.head(5)['Dates'].apply(lambda x: x.weekday())
输出将如下所示:
0 3
1 4
2 5
3 6
4 0
Name: Dates, dtype: int64
答案 16 :(得分:2)
这里是如何将日期列表转换为日期
import datetime,time
ls={'1/1/2007','1/2/2017'}
dt=datetime.datetime.strptime(ls[1], "%m/%d/%Y")
print(dt)
print(dt.month)
print(dt.year)
答案 17 :(得分:2)
要将星期日作为1到星期六7,这是你问题最简单的解决方案:
datetime.date.today().toordinal()%7 + 1
所有这些:
import datetime
today = datetime.date.today()
sunday = today - datetime.timedelta(today.weekday()+1)
for i in range(7):
tmp_date = sunday + datetime.timedelta(i)
print tmp_date.toordinal()%7 + 1, '==', tmp_date.strftime('%A')
输出:
1 == Sunday
2 == Monday
3 == Tuesday
4 == Wednesday
5 == Thursday
6 == Friday
7 == Saturday
答案 18 :(得分:1)
一个简单,直接但仍未提及的选项:
DataFrame
答案 19 :(得分:1)
这不需要星期几评论。
我推荐这个代码~!
import datetime
DAY_OF_WEEK = {
"MONDAY": 0,
"TUESDAY": 1,
"WEDNESDAY": 2,
"THURSDAY": 2,
"FRIDAY": 2,
"SATURDAY": 2,
"SUNDAY": 6
}
def string_to_date(dt, format='%Y%m%d'):
return datetime.datetime.strptime(dt, format)
def date_to_string(date, format='%Y%m%d'):
return datetime.datetime.strftime(date, format)
def day_of_week(dt):
return string_to_date(dt).weekday()
dt = '20210101'
if day_of_week(dt) == DAY_OF_WEEK['SUNDAY']:
None
答案 20 :(得分:1)
如果将日期作为字符串,则使用熊猫的时间戳记可能更容易
import pandas as pd
df = pd.Timestamp("2019-04-12")
print(df.dayofweek, df.weekday_name)
输出:
4 Friday
答案 21 :(得分:1)
这是我的python3实现。
months = {'jan' : 1, 'feb' : 4, 'mar' : 4, 'apr':0, 'may':2, 'jun':5, 'jul':6, 'aug':3, 'sep':6, 'oct':1, 'nov':4, 'dec':6}
dates = {'Sunday':1, 'Monday':2, 'Tuesday':3, 'Wednesday':4, 'Thursday':5, 'Friday':6, 'Saterday':0}
ranges = {'1800-1899':2, '1900-1999':0, '2000-2099':6, '2100-2199':4, '2200-2299':2}
def getValue(val, dic):
if(len(val)==4):
for k,v in dic.items():
x,y=int(k.split('-')[0]),int(k.split('-')[1])
val = int(val)
if(val>=x and val<=y):
return v
else:
return dic[val]
def getDate(val):
return (list(dates.keys())[list(dates.values()).index(val)])
def main(myDate):
dateArray = myDate.split('-')
# print(dateArray)
date,month,year = dateArray[2],dateArray[1],dateArray[0]
# print(date,month,year)
date = int(date)
month_v = getValue(month, months)
year_2 = int(year[2:])
div = year_2//4
year_v = getValue(year, ranges)
sumAll = date+month_v+year_2+div+year_v
val = (sumAll)%7
str_date = getDate(val)
print('{} is a {}.'.format(myDate, str_date))
if __name__ == "__main__":
testDate = '2018-mar-4'
main(testDate)
答案 22 :(得分:1)
使用Canlendar模块
template <int T>
void foo() {
for constexpr (auto i = 0; i < T; ++i) cout << i << endl;
}
答案 23 :(得分:0)
以下是以DD-MM-YYYY格式输入日期的代码,您可以通过更改'%d-%m-%Y'的顺序以及更改定界符来更改输入格式。
import datetime
try:
date = input()
date_time_obj = datetime.datetime.strptime(date, '%d-%m-%Y')
print(date_time_obj.strftime('%A'))
except ValueError:
print("Invalid date.")
答案 24 :(得分:0)
import datetime
int(datetime.datetime.today().strftime('%w'))+1
这应该给您您的真实日期-1 =星期日,2 =星期一,等等...
答案 25 :(得分:-1)
使用此代码:
import pandas as pd
from datetime import datetime
print(pd.DatetimeIndex(df['give_date']).day)
答案 26 :(得分:-1)
将numpy导入为np
定义日期(df):
df['weekday'] = df['date'].dt.day_name()
conditions = [(df['weekday'] == 'Sunday'),
(df['weekday'] == 'Monday'),
(df['weekday'] == 'Tuesday'),
(df['weekday'] == 'Wednesday'),
(df['weekday'] == 'Thursday'),
(df['weekday'] == 'Friday'),
(df['weekday'] == 'Saturday')]
choices = [0, 1, 2, 3, 4, 5, 6]
df['week'] = np.select(conditions, choices)
return df