commit d322abbb83eb751045246a70f39d040d13a6108b
author Serhiy Storchaka <storchaka@gmail.com> Sat Sep 14 13:31:50 2019 +0300
committer GitHub <noreply@github.com> Sat Sep 14 13:31:50 2019 +0300
tree 40ecc91950b369af1aaaebdd677c071aeae72d53
parent 66da347ef0034ad9bddc7fad112025c886249f0d

[3.8] bpo-37206: Unrepresentable default values no longer represented as None. (GH-13933) (GH-16141)

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.
(cherry picked from commit 279f44678c8b84a183f9eeb85e0b086228154497)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Modules/_io/fileio.c

diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 7f784a3..9166c60 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -979,7 +979,7 @@
 #ifdef HAVE_FTRUNCATE
 /*[clinic input]
 _io.FileIO.truncate
-    size as posobj: object = NULL
+    size as posobj: object = None
     /
 
 Truncate the file to at most size bytes and return the truncated size.
@@ -990,7 +990,7 @@
 
 static PyObject *
 _io_FileIO_truncate_impl(fileio *self, PyObject *posobj)
-/*[clinic end generated code: output=e49ca7a916c176fa input=9026af44686b7318]*/
+/*[clinic end generated code: output=e49ca7a916c176fa input=b0ac133939823875]*/
 {
     Py_off_t pos;
     int ret;
@@ -1002,7 +1002,7 @@
     if (!self->writable)
         return err_mode("writing");
 
-    if (posobj == Py_None || posobj == NULL) {
+    if (posobj == Py_None) {
         /* Get the current position. */
         posobj = portable_lseek(self, NULL, 1);
         if (posobj == NULL)