code: def read_folder(folder):
      
      import glob
      recordings = []
      for filename in natsorted(glob.glob("%s/*.inkml" % folder)):
          hw = read(filename)
          if hw.formula_in_latex is not None:
              hw.formula_in_latex = hw.formula_in_latex.strip()
          if hw.formula_in_latex is None or \
             not hw.formula_in_latex.startswith('$') or \
             not hw.formula_in_latex.endswith('$'):
              if hw.formula_in_latex is not None:
                  logging.info("Starts with: %s",
                               str(hw.formula_in_latex.startswith('$')))
                  logging.info("ends with: %s",
                               str(hw.formula_in_latex.endswith('$')))
              logging.info(hw.formula_in_latex)
              logging.info(hw.segmentation)
              hw.show()
          recordings.append(hw)
      return recordings
docs: Parameters
      ----------
      folder : string
          Path to a folde with *.inkml files.
  
      Returns
      -------
      list :
          Objects of the type HandwrittenData