Antoine Pitrou added the comment:
Note that the module state is only used when no explicit encoding is given to
TextIOWrapper(), so the following patch fixes this particular issue:
$ hg di
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -852,7 +852,7 @@ textiowrapper_init(textio *self, PyObjec
char *errors = NULL;
char *newline = NULL;
int line_buffering = 0, write_through = 0;
- _PyIO_State *state = IO_STATE;
+ _PyIO_State *state = NULL;
PyObject *res;
int r;
@@ -891,6 +891,7 @@ textiowrapper_init(textio *self, PyObjec
if (encoding == NULL) {
/* Try os.device_encoding(fileno) */
PyObject *fileno;
+ state = IO_STATE;
fileno = _PyObject_CallMethodId(buffer, &PyId_fileno, NULL);
/* Ignore only AttributeError and UnsupportedOperation */
if (fileno == NULL) {
However, since doing I/O at shutdown is not a particularly uncommon operation,
we should still fix the general case to at least raise a proper exception.
----------
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<http://bugs.python.org/issue20037>
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