A certain improvement on @taymon`s answer:
today = datetime.date.today()
friday = today + datetime.timedelta( (4-today.weekday()) % 7 )
4 is Friday's weekday (0 based, counting from Monday).
( (4-today.weekday()) % 7) is the number of days till next friday (% is always non-negative).
After seeing @ubuntu's answer, I should add two things:
1. I'm not sure if Friday=4 is universally true. Some people start their week on Sunday.
2. On Friday, this code returns the same day. To get the next, use (3-today.weekday())%7+1. Just the old x%n to ((x-1)%n)+1 conversion.
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