[Python-bugs-list] [ python-Bugs-663074 ] codec registry and Python embedding problem

[SourceForge.net]

Bugs item #663074, was opened at 2003-01-06 13:17
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=663074&group_id=5470

Category: Python Interpreter Core
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: M.-A. Lemburg (lemburg)
Assigned to: M.-A. Lemburg (lemburg)
Summary: codec registry and Python embedding problem

Initial Comment:
Found by Hartmut Ring:

#include <Python.h>
int main() {
  for (int i=0; i<2; i++) {
    Py_Initialize();
    PyRun_SimpleString("a = u'\xe4'.encode('Latin-1')");
    Py_Finalize();
  }
  return 0;
}

First try runs fine, second try gives:

Traceback (most recent call last):
  File "<string>", line 1, in ?
LookupError: no codec search functions registered:
can't find encoding



----------------------------------------------------------------------

>Comment By: M.-A. Lemburg (lemburg)
Date: 2003-01-22 13:12

Message:
Logged In: YES 
user_id=38388

Good suggestion. Do you have time to cook up a patch ?

----------------------------------------------------------------------

Comment By: Martin v. Löwis (loewis)
Date: 2003-01-22 11:07

Message:
Logged In: YES 
user_id=21627

I think the various global variables maintained in codecs.c
(_PyCodec_SearchCache, import_encodings_called, ...) need to
become part of the interpreter state. Otherwise, a codec
registered in one interpreter will be found in another.

Also, it appears that import_encodings_called can be
eliminated. Instead, a NULL value of _PyCodec_SearchPath
could be used to indicate whether initialization has taken
place. 

----------------------------------------------------------------------

Comment By: M.-A. Lemburg (lemburg)
Date: 2003-01-06 13:18

Message:
Logged In: YES 
user_id=38388

This is due to a flag used in codecs.c:

/* Flag used for lazy import of the standard encodings
package */
static int import_encodings_called = 0;

The solution is to reset this flag in Py_Finalize().

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=663074&group_id=5470