一个简单、直接但尚未提及的选项：

import datetime
...
givenDateObj = datetime.date(2017, 10, 20)
weekday      = givenDateObj.isocalendar()[2] # 5
weeknumber   = givenDateObj.isocalendar()[1] # 42

使用Canlendar模块

import calendar
a=calendar.weekday(year,month,day)
days=["MONDAY","TUESDAY","WEDNESDAY","THURSDAY","FRIDAY","SATURDAY","SUNDAY"]
print(days[a])

datetime库有时会出现strptime（）错误，所以我切换到dateutil库。下面是一个如何使用它的示例：

from dateutil import parser
parser.parse('January 11, 2010').strftime("%a")

您从中获得的输出是“Mon”。如果希望输出为“星期一”，请使用以下命令：

parser.parse('January 11, 2010').strftime("%A")

这对我很快奏效。我在使用日期时间库时遇到了问题，因为我想存储工作日名称而不是工作日编号，而使用日期时间的格式导致了问题。如果你对此没有问题，那太好了！如果你是这样的话，你可以明确地这样做，因为它的语法也更简单。希望这有帮助。

如果您希望生成一个包含日期范围（Date）的列，并生成一个指向第一个日期并指定周日（Week Day）的列（我将使用从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：

工作日从0到6不等，其中0对应于周一，6对应于周日。

1700/1/1之后的日期不需要导入的解决方案

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')

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()])

输出示例

08 05 2015
Friday