python 获取星期几

In [17]: now.strftime(%a),now.strftime(%w)
Out[17]: ('Mon', '1')

Directive   Meaning
%a  Weekday name.
%A  Full weekday name.
%b  Abbreviated month name.
%B  Full month name.
%c  Appropriate date and time representation.
%d  Day of the month as a decimal number [01,31].
%H  Hour (24-hour clock) as a decimal number [00,23].
%I  Hour (12-hour clock) as a decimal number [01,12].
%j  Day of the year as a decimal number [001,366].
%m  Month as a decimal number [01,12].
%M  Minute as a decimal number [00,59].
%p  Equivalent of either AM or PM.
%S  Second as a decimal number [00,61].
%U  Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0.
%w  Weekday as a decimal number [0(Sunday),6].
%W  Week number of the year (Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0.
%x  Appropriate date representation.
%X  Apropriate time representation.
%y  Year without century as a decimal number [00,99].
%Y  Year with century as a decimal number.
%Z  Time zone name (no characters if no time zone exists).
%%  A literal '%' character.