如何提供星期几和星期几

Question

This program is strictly set in the year of 2014. However, I want to know if I am heading in the right direction. This is what I have so far:

def day(d,m): # Function for determining day name for a given date.
    """Where m is an integer from 1 through 12 expressing a month, and d is an integer from 
    1 through 31 expressing the day-part of a date in 2014."""

    day = ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa']
    weekday = (d + (2.6*m - 0.2) -2*20 + 2014 + (2014//4) + (20//4))
    return day[weekday]

Answer 1

Don't reinvent the wheel :

>>> import datetime
>>> datetime.datetime(2014, 2, 16).strftime('%a')
'Sun'

---

Or as a number :

>>> import datetime
>>> datetime.datetime(2014, 2, 16).weekday()
6

Which you can then pass into your day list

Answer 2

If you can't use datetime , this should work:

def day(d, m):
    day = (sum((31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)[:m-1]) + d + 3) % 7
#           ^                                                     ^      ^   ^  ^ ^
#           '---- adding up the days in the months                |      |   |  | |
#                   up to but not including the current month ----'      |   |  | |
#                                  plus the current day of the month ----'   |  | |
#                                  and the day of the week on 12/31/2013 ----'  | |
#                    modulus (%) is what's left over after integer division ----' |
#                                                        seven days in a week ----'