[issue40939] Remove the old parser

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> There is no mention of PyParser_SimpleParseFile() removal in What's New in Python 3.10.

By the way, is there a replacement for this function? The unbound project uses it to display a SyntaxError when PyRun_SimpleFile() fails.

Petr Menšík asked:

"Could we instead modify PyRun_SimpleFile call to produce just one exception, then print it to stderr once and once into the log? (...) But it seems PyRun_SimpleFile does not throw Exception. Can you recommend variant or flags, which would make it raise an Exception, which log_py_err() would then to log file? After commenting out PyParser_SimpleParseFile it reports None, so it did not already raise an exception."

https://bugzilla.redhat.com/show_bug.cgi?id=1889726#c3

unbound used the removed function PyParser_SimpleParseFile() in pythonmod/pythonmod.c. Extract of unbound-1.12.0.tar.gz:

   if (PyRun_SimpleFile(script_py, pe->fname) < 0) {
      log_err("pythonmod: can't parse Python script %s", pe->fname);
      /* print the error to logs too, run it again */
      fseek(script_py, 0, SEEK_SET);
      /* we don't run the file, like this, because then side-effects
       *    s = PyRun_File(script_py, pe->fname, Py_file_input, 
       *        PyModule_GetDict(PyImport_AddModule("__main__")), pe->dict);
       * could happen (again). Instead we parse the file again to get
       * the error string in the logs, for when the daemon has stderr
       * removed.  SimpleFile run already printed to stderr, for then
       * this is called from unbound-checkconf or unbound -dd the user
       * has a nice formatted error.
      */
      /* ignore the NULL return of _node, it is NULL due to the parse failure
       * that we are expecting */
      (void)PyParser_SimpleParseFile(script_py, pe->fname, Py_file_input);
      log_py_err();
      PyGILState_Release(gil);
      fclose(script_py);
      return 0;
   }

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40939>
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