nextmonth.py

import datetime

# I wanna create some thing in advance monthly, so I need to know the next month(and next year as well).
# Calculating previos month is pretty simple, send 'days=-1' to timedelta.

def nextmo(d, days=31):
    """Return today's next month. If want previous month, set 'days' to '-1'."""
    mo = d.month
    yr = d.year
    nm = datetime.date(yr,mo,1)+datetime.timedelta(days=days)
    return nm

if __name__ == "__main__":
    dd = datetime.date(2000,1,31)
    nm = nextmo(dd)
    print "Next year: %s, next month: %s" % (nm.year, nm.month)