code: def check_sentence_spacing(text):
      
      err = "typography.symbols.sentence_spacing"
      msg = u"More than two spaces after the period; use 1 or 2."
      regex = "\. {3}"
  
      return existence_check(
          text, [regex], err, msg, max_errors=3, require_padding=False)
docs: Use no more than two spaces after a period.