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-rw-r--r--Modules/_io/fileio.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 4f450da..ff278cf 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -417,7 +417,8 @@ err_closed(void)
static PyObject *
err_mode(char *action)
{
- PyErr_Format(PyExc_ValueError, "File not open for %s", action);
+ PyErr_Format(IO_STATE->unsupported_operation,
+ "File not open for %s", action);
return NULL;
}