Change WriterObj.writeline to WriterObj.write (GH-12344)

This cleans the csv module a bit, I don't think it requires a bpo issue or a news entry.

Author: Rémi Lapeyre

Modules/_csv.c

@@ -111,7 +111,7 @@ static PyTypeObject Reader_Type;
 typedef struct {
     PyObject_HEAD
 
-    PyObject *writeline;    /* write output lines to this file */
+    PyObject *write;    /* write output lines to this file */
 
     DialectObj *dialect;    /* parsing dialect */
 
@@ -1231,14 +1231,16 @@ csv_writerow(WriterObj *self, PyObject *seq)
 
     /* Add line terminator.
      */
-    if (!join_append_lineterminator(self))
+    if (!join_append_lineterminator(self)) {
         return NULL;
+    }
 
     line = PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND,
                                      (void *) self->rec, self->rec_len);
-    if (line == NULL)
+    if (line == NULL) {
         return NULL;
-    result = PyObject_CallFunctionObjArgs(self->writeline, line, NULL);
+    }
+    result = PyObject_CallFunctionObjArgs(self->write, line, NULL);
     Py_DECREF(line);
     return result;
 }
@@ -1294,7 +1296,7 @@ Writer_dealloc(WriterObj *self)
 {
     PyObject_GC_UnTrack(self);
     Py_XDECREF(self->dialect);
-    Py_XDECREF(self->writeline);
+    Py_XDECREF(self->write);
     if (self->rec != NULL)
         PyMem_Free(self->rec);
     PyObject_GC_Del(self);
@@ -1304,15 +1306,15 @@ static int
 Writer_traverse(WriterObj *self, visitproc visit, void *arg)
 {
     Py_VISIT(self->dialect);
-    Py_VISIT(self->writeline);
+    Py_VISIT(self->write);
     return 0;
 }
 
 static int
 Writer_clear(WriterObj *self)
 {
     Py_CLEAR(self->dialect);
-    Py_CLEAR(self->writeline);
+    Py_CLEAR(self->write);
     return 0;
 }
 
@@ -1369,7 +1371,7 @@ csv_writer(PyObject *module, PyObject *args, PyObject *keyword_args)
         return NULL;
 
     self->dialect = NULL;
-    self->writeline = NULL;
+    self->write = NULL;
 
     self->rec = NULL;
     self->rec_size = 0;
@@ -1380,8 +1382,8 @@ csv_writer(PyObject *module, PyObject *args, PyObject *keyword_args)
         Py_DECREF(self);
         return NULL;
     }
-    self->writeline = _PyObject_GetAttrId(output_file, &PyId_write);
-    if (self->writeline == NULL || !PyCallable_Check(self->writeline)) {
+    self->write = _PyObject_GetAttrId(output_file, &PyId_write);
+    if (self->write == NULL || !PyCallable_Check(self->write)) {
         PyErr_SetString(PyExc_TypeError,
                         "argument 1 must have a \"write\" method");
         Py_DECREF(self);