Python time processing datetime instance

Many chapters in the PythonCook book describe the use of a database or combine multiple functions to implement some complex functions. I skipped some sections on file processing in the previous section and went directly to the section on time operations. Datetime is also a brief introduction. Because there are many things that need to be used by yourself, it is most effective to check for help.
Example:
Calculate and output the last Friday.
Answer:

The code is as follows:

Import datetime, calendar

LastFriday = datetime. date. today ()
Oneday = datetime. timedelta (days = 1)
LastFriday-= oneday
While lastFriday. weekday ()! = Calendar. FRIDAY:
LastFriday-= oneday
Print lastFriday. strftime ('% A, % d-% B-% Y ')

Output result:
Friday, 09-May-2008.