from datetime import datetime, timedelta


start = datetime(2015, 1, 1)
end = datetime(2016, 1, 1)

interval = timedelta(days=1)

current = start


line = ''
while current < end:
    # sunday
    if current.isoweekday() == 7:
        line += current.strftime('Week #%W: %Y-%m-%d')

    if current.isoweekday() == 6:
        line += current.strftime(' - %Y-%m-%d')
        print(line)
        line = ''
    current += interval