docs: def dollar_signs(value, failure_string='N/A'):
      """
      Converts an integer into the corresponding number of dollar sign symbols.
      
      If the submitted value isn't a string, returns the `failure_string` keyword
      argument.
      
      Meant to emulate the illustration of price range on Yelp.
      """
      try:
          count = int(value)
      except ValueError:
          return failure_string
      string = ''
      for i in range(0, count):
          string += '$'
      return string