code: def build_rrule_from_dateutil_rrule(rule):
      
      lines = str(rule).splitlines()
      for line in lines:
          if line.startswith('DTSTART:'):
              continue
          if line.startswith('RRULE:'):
              line = line[6:]
          return build_rrule_from_text(line)
docs: Build rrule dictionary for vRecur class from a dateutil rrule.
  
      Dateutils rrule is a popular implementation of rrule in python.
      https://pypi.org/project/python-dateutil/
      this is a shortcut to interface between dateutil and icalendar.