bpo-37206: Unrepresentable default values no longer represented as None. (GH-13933)

In ArgumentClinic, value "NULL" should now be used only for unrepresentable default values
(like in the optional third parameter of getattr). "None" should be used if None is accepted
as argument and passing None has the same effect as not passing the argument at all.

1 files changed, 4 insertions, 4 deletions

diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c
index 162b288..b4cc894 100644
--- a/Modules/_io/_iomodule.c
+++ b/Modules/_io/_iomodule.c
@@ -103,9 +103,9 @@ _io.open
     file: object
     mode: str = "r"
     buffering: int = -1
-    encoding: str(accept={str, NoneType}) = NULL
-    errors: str(accept={str, NoneType}) = NULL
-    newline: str(accept={str, NoneType}) = NULL
+    encoding: str(accept={str, NoneType}) = None
+    errors: str(accept={str, NoneType}) = None
+    newline: str(accept={str, NoneType}) = None
     closefd: bool(accept={int}) = True
     opener: object = None
 
@@ -233,7 +233,7 @@ static PyObject *
 _io_open_impl(PyObject *module, PyObject *file, const char *mode,
               int buffering, const char *encoding, const char *errors,
               const char *newline, int closefd, PyObject *opener)
-/*[clinic end generated code: output=aefafc4ce2b46dc0 input=03da2940c8a65871]*/
+/*[clinic end generated code: output=aefafc4ce2b46dc0 input=7295902222e6b311]*/
 {
     unsigned i;