code: def natural_keys(text):
      
  
      # - alist.sort(key=natural_keys) sorts in human order
      # http://nedbatchelder.com/blog/200712/human_sorting.html
      # (See Toothy's implementation in the comments)
      def atoi(text):
          return int(text) if text.isdigit() else text
  
      return [atoi(c) for c in re.split('(\d+)', text)]
docs: Sort list of string with number in human order.
  
      Examples
      ----------
      >>> l = ['im1.jpg', 'im31.jpg', 'im11.jpg', 'im21.jpg', 'im03.jpg', 'im05.jpg']
      >>> l.sort(key=tl.files.natural_keys)
      ['im1.jpg', 'im03.jpg', 'im05', 'im11.jpg', 'im21.jpg', 'im31.jpg']
      >>> l.sort() # that is what we dont want
      ['im03.jpg', 'im05', 'im1.jpg', 'im11.jpg', 'im21.jpg', 'im31.jpg']
  
      References
      ----------
      - `link <http://nedbatchelder.com/blog/200712/human_sorting.html>`__