code: def make_shp_filename(place_name):
      
      name_pieces = list(reversed(place_name.split(', ')))
      filename = '-'.join(name_pieces).lower().replace(' ','_')
      filename = re.sub('[^0-9a-zA-Z_-]+', '', filename)
      return filename
docs: Create a filename string in a consistent format from a place name string.
  
      Parameters
      ----------
      place_name : string
          place name to convert into a filename
  
      Returns
      -------
      string