Fix E392.

parso/python/normalizer.py

@@ -642,6 +642,9 @@ class PEP8Normalizer(Normalizer):
                 indentation = re.match('[ \t]*', line).group(0)
                 start_pos = leaf.line + i, len(indentation)
                 # TODO check multiline indentation.
+        elif typ == 'endmarker':
+            if self._newline_count >= 2:
+                self.add_issue(391, 'Blank line at end of file', leaf)
 
         return leaf.value
 
@@ -676,7 +679,7 @@ class FooRule(Rule):
 
 @PEP8NormalizerConfig.register_rule
 class BlankLineAtEnd(Rule):
-    code = 'W391'
+    code = 391
     message = 'blank line at end of file'
 
     leaf_event = ['endmarker']

test/test_pep8.py

@@ -19,3 +19,15 @@ def test_eof_newline():
     assert_issue('# foobar')
     assert_issue('')
     assert_issue('foo = 1  # comment')
+
+
+def test_eof_blankline():
+    def assert_issue(code):
+        found = issues(code)
+        assert len(found) == 1
+        issue, = found
+        assert issue.code == 391
+
+    assert_issue('asdf = 1\n\n')
+    assert_issue('# foobar\n\n')
+    assert_issue('\n\n')