diff -r f5ed3a5440b2 Modules/_csv.c
--- a/Modules/_csv.c	Mon Sep 24 20:17:17 2012 +0100
+++ b/Modules/_csv.c	Tue Sep 25 00:59:01 2012 +0300
@@ -788,9 +788,14 @@
         lineobj = PyIter_Next(self->input_iter);
         if (lineobj == NULL) {
             /* End of input OR exception */
-            if (!PyErr_Occurred() && self->field_len != 0)
-                PyErr_Format(_csvstate_global->error_obj,
-                             "newline inside string");
+            if (!PyErr_Occurred() && (self->field_len != 0 ||
+                                      self->state == IN_QUOTED_FIELD)) {
+                if (self->dialect->strict)
+                    PyErr_SetString(_csvstate_global->error_obj,
+                                    "unexpected end of data");
+                else if (parse_save_field(self) >= 0)
+                    break;
+            }
             return NULL;
         }
         if (!PyUnicode_Check(lineobj)) {