return a degrees:minutes:seconds string

def degrees_to_dms(degrees):
    '''return a degrees:minutes:seconds string'''
    deg = int(degrees)
    min = int((degrees - deg)*60)
    sec = ((degrees - deg) - (min/60.0))*60*60
    return u'%d\u00b0%02u\'%05.2f"' % (deg, abs(min), abs(sec))