Fix CSV exporter for non string Python types.

scrapy/exporters.py

@@ -200,7 +200,7 @@ class CsvItemExporter(BaseItemExporter):
             try:
                 yield to_native_str(s)
             except TypeError:
-                yield to_native_str(repr(s))
+                yield to_native_str(str(s))
 
     def _write_headers_and_set_fields_to_export(self, item):
         if self.include_headers_line:

tests/test_exporters.py

@@ -271,6 +271,21 @@ class CsvItemExporterTest(BaseItemExporterTest):
             expected='"[4, 8]",John\r\n',
         )
 
+    def test_other_python_types_item(self):
+        from datetime import datetime
+        now = datetime(2015, 1, 1, 1, 1, 1)
+        item = {
+            'boolean': False,
+            'number': 22,
+            'time': now,
+            'float': 3.14,
+        }
+        self.assertExportResult(
+            item=item,
+            include_headers_line=False,
+            expected='22,False,3.14,2015-01-01 01:01:01\r\n'
+        )
+
 
 class XmlItemExporterTest(BaseItemExporterTest):