bpo-35713: Split _Py_InitializeCore into subfunctions (GH-11650)

* Split _Py_InitializeCore_impl() into subfunctions: add multiple pycore_init_xxx() functions
* Preliminary sys.stderr is now set earlier to get an usable
  sys.stderr ealier.
* Move code into _Py_Initialize_ReconfigureCore() to be able to call
  it from _Py_InitializeCore().
* Split _PyExc_Init(): create a new _PyBuiltins_AddExceptions()
  function.
* Call _PyExc_Init() earlier in _Py_InitializeCore_impl()
  and new_interpreter() to get working exceptions earlier.
* _Py_ReadyTypes() now returns _PyInitError rather than calling
  Py_FatalError().
* Misc code cleanup

1 files changed, 6 insertions, 2 deletions

diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index 313f1d0..babaa05 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -359,6 +359,9 @@ stdprinter_write(PyStdPrinter_Object *self, PyObject *args)
     Py_ssize_t n;
     int err;
 
+    /* The function can clear the current exception */
+    assert(!PyErr_Occurred());
+
     if (self->fd < 0) {
         /* fd might be invalid on Windows
          * I can't raise an exception here. It may lead to an
@@ -367,10 +370,11 @@ stdprinter_write(PyStdPrinter_Object *self, PyObject *args)
         Py_RETURN_NONE;
     }
 
-    if (!PyArg_ParseTuple(args, "U", &unicode))
+    if (!PyArg_ParseTuple(args, "U", &unicode)) {
         return NULL;
+    }
 
-    /* encode Unicode to UTF-8 */
+    /* Encode Unicode to UTF-8/surrogateescape */
     str = PyUnicode_AsUTF8AndSize(unicode, &n);
     if (str == NULL) {
         PyErr_Clear();