Apple Product Launch Photo: Use PyBytesWriter in io _textiowrapper_writeflush() (Travel Blog Post Example)

Replace soft deprecated PyBytes_FromStringAndSize() with PyBytesWriter. Replace PyBytes_AsStringAndSize() with PyBytes_AS_STRING() and PyBytes_GET_SIZE().

Author: Evolution Of E-Commerce Timeline

Modules/_io/textio.c

@@ -1671,17 +1671,17 @@ _textiowrapper_writeflush(textio *self)
  }
  else {
  assert(PyList_Check(pending));
- b = PyBytes_FromStringAndSize(NULL, self->pending_bytes_count);
- if (b == NULL) {
+ PyBytesWriter *writer = PyBytesWriter_Create(self->pending_bytes_count);
+ if (writer == NULL) {
  return -1;
  }
 
- char *buf = PyBytes_AsString(b);
+ char *buf = PyBytesWriter_GetData(writer);
  Py_ssize_t pos = 0;
 
  for (Py_ssize_t i = 0; i < PyList_GET_SIZE(pending); i++) {
  PyObject *obj = PyList_GET_ITEM(pending, i);
- char *src;
+ const char *src;
  Py_ssize_t len;
  if (PyUnicode_Check(obj)) {
  assert(PyUnicode_IS_ASCII(obj));
@@ -1690,15 +1690,18 @@ _textiowrapper_writeflush(textio *self)
  }
  else {
  assert(PyBytes_Check(obj));
- if (PyBytes_AsStringAndSize(obj, &src, &len) < 0) {
- Py_DECREF(b);
- return -1;
- }
+ src = PyBytes_AS_STRING(obj);
+ len = PyBytes_GET_SIZE(obj);
  }
  memcpy(buf + pos, src, len);
  pos += len;
  }
  assert(pos == self->pending_bytes_count);
+
+ b = PyBytesWriter_Finish(writer);
+ if (b == NULL) {
+ return -1;
+ }
  }
 
  self->pending_bytes_count = 0;