diff -r 0d54a78861cf Lib/csv.py
--- a/Lib/csv.py	Mon Jun 15 09:11:14 2015 -0700
+++ b/Lib/csv.py	Tue Jun 16 18:05:38 2015 +0200
@@ -13,11 +13,14 @@
 
 from io import StringIO
 
-__all__ = [ "QUOTE_MINIMAL", "QUOTE_ALL", "QUOTE_NONNUMERIC", "QUOTE_NONE",
-            "Error", "Dialect", "__doc__", "excel", "excel_tab",
-            "field_size_limit", "reader", "writer",
-            "register_dialect", "get_dialect", "list_dialects", "Sniffer",
-            "unregister_dialect", "__version__", "DictReader", "DictWriter" ]
+
+__all__ = ["QUOTE_MINIMAL", "QUOTE_ALL", "QUOTE_NONNUMERIC", "QUOTE_NONE",
+           "Error", "Dialect", "__doc__", "excel", "excel_tab",
+           "field_size_limit", "reader", "writer",
+           "register_dialect", "get_dialect", "list_dialects", "Sniffer",
+           "unregister_dialect", "__version__", "DictReader", "DictWriter",
+           "unix_dialect"]
+
 
 class Dialect:
     """Describe a CSV dialect.
@@ -50,6 +53,7 @@
             # We do this for compatibility with py2.3
             raise Error(str(e))
 
+
 class excel(Dialect):
     """Describe the usual properties of Excel-generated CSV files."""
     delimiter = ','
@@ -60,11 +64,13 @@
     quoting = QUOTE_MINIMAL
 register_dialect("excel", excel)
 
+
 class excel_tab(excel):
     """Describe the usual properties of Excel-generated TAB-delimited files."""
     delimiter = '\t'
 register_dialect("excel-tab", excel_tab)
 
+
 class unix_dialect(Dialect):
     """Describe the usual properties of Unix-generated CSV files."""
     delimiter = ','
diff -r 0d54a78861cf Lib/test/test_csv.py
--- a/Lib/test/test_csv.py	Mon Jun 15 09:11:14 2015 -0700
+++ b/Lib/test/test_csv.py	Tue Jun 16 18:05:38 2015 +0200
@@ -1084,5 +1084,21 @@
             self.assertEqual(fileobj.read(), expected)
 
 
+class MiscTestCase(unittest.TestCase):
+    def test__all__(self):
+        # QUOTE_* do not provide __module__ attribute.
+        expected = {'__doc__', '__version__', 'QUOTE_MINIMAL', 'QUOTE_ALL',
+                    'QUOTE_NONNUMERIC', 'QUOTE_NONE',
+                    }
+        blacklist = set()
+        for name in dir(csv):
+            if name.startswith('_') or name in blacklist:
+                continue
+            module_object = getattr(csv, name)
+            if getattr(module_object, '__module__', None) in ('csv', '_csv'):
+                expected.add(name)
+        self.assertEqual(set(csv.__all__), expected)
+
+
 if __name__ == '__main__':
     unittest.main()