code: def get_length(topics, yaml_info):
      '''
      Find the length (# of rows) in the created dataframe
      '''
      total = 0
      info = yaml_info['topics']
      for topic in topics:
          for t in info:
              if t['topic'] == topic:
                  total = total + t['messages']
                  break
      return totaf get_length(topics, yaml_info):
      '''
      Find the length (# of rows) in the created dataframe
      '''
      total = 0
      info = yaml_info['topics']
      for topic in topics:
          for t in info:
              if t['topic'] == topic:
                  total = total + t['messages']
                  break
      return total
docs: Find the length (# of rows) in the created dataframe