python datetime, convert weekday's abbrv to number?

How would i go about converting a weekday abbreviation (%a) into the weekday number (%u) using python d开发者_如何学JAVAatetime module?

>>> import calendar
>>> zip(list(calendar.day_abbr), range(7))
[('Mon', 0), ('Tue', 1), ('Wed', 2), ('Thu', 3), ('Fri', 4), ('Sat', 5), ('Sun', 6)]

Better use the time.strptime function, which depends on the locale. If it is set to English (usually by default), you should get

>>> import time 
>>> time.strptime("Tue", '%a').tm_wday
>>> 1

Call the datetime module with an arbitrary date and save the results for the conversions for %a and %u in a map. %a is the key for this map, %u is the value.

Increment the date by one day.

Repeat 7 times.

Now you have a map which returns the value you seek for any possible value of %a.