code: def parse_series_args(topics, fields):
      '''Return which topics and which field keys need to be examined
      for plotting'''
      keys = {}
      for field in fields:
          for topic in topics:
              if field.startswith(topic):
                  keys[field] = (topic, field[len(topic) + 1:])
  
      return keyf parse_series_args(topics, fields):
      '''Return which topics and which field keys need to be examined
      for plotting'''
      keys = {}
      for field in fields:
          for topic in topics:
              if field.startswith(topic):
                  keys[field] = (topic, field[len(topic) + 1:])
  
      return keys
docs: Return which topics and which field keys need to be examined
      for plotting