code: def check_espeak(cls):
          
          try:
              from aeneas.textfile import TextFile
              from aeneas.textfile import TextFragment
              from aeneas.ttswrappers.espeakttswrapper import ESPEAKTTSWrapper
              text = u"From fairest creatures we desire increase,"
              text_file = TextFile()
              text_file.add_fragment(TextFragment(language=u"eng", lines=[text], filtered_lines=[text]))
              handler, output_file_path = gf.tmp_file(suffix=u".wav")
              ESPEAKTTSWrapper().synthesize_multiple(text_file, output_file_path)
              gf.delete_file(handler, output_file_path)
              gf.print_success(u"espeak         OK")
              return False
          except:
              pass
          gf.print_error(u"espeak         ERROR")
          gf.print_info(u"  Please make sure you have espeak installed correctly")
          gf.print_info(u"  and that its path is in your PATH environment variable")
          gf.print_info(u"  You might also want to check that the espeak-data directory")
          gf.print_info(u"  is set up correctly, for example, it has the correct permissions")
          return True
docs: Check whether ``espeak`` can be called.
  
          Return ``True`` on failure and ``False`` on success.
  
          :rtype: bool