code: def label_value(label_info, multi_line=True):
      
      label_info = label_info.astype(str)
      if not multi_line:
          label_info = collapse_label_lines(label_info)
  
      return label_info
docs: Convert series values to str and maybe concatenate them
  
      Parameters
      ----------
      label_info : series
          Series whose values will be returned
      multi_line : bool
          Whether to place each variable on a separate line
  
      Returns
      -------
      out : series
          Label text strings