minor code cleanup

Cython/Compiler/AutoDocTransforms.py

@@ -70,7 +70,7 @@ class EmbedSignature(CythonTransform):
         except Exception:
             try:
                 return self._fmt_expr_node(default_val)
-            except AttributeError as e:
+            except AttributeError:
                 return '<???>'
 
     def _fmt_arg(self, arg):
@@ -190,7 +190,7 @@ class EmbedSignature(CythonTransform):
                 old_doc = node.py_func.entry.doc
             else:
                 old_doc = None
-            new_doc  = self._embed_signature(signature, old_doc)
+            new_doc = self._embed_signature(signature, old_doc)
             doc_holder.doc = EncodedString(new_doc)
             if not is_constructor and getattr(node, 'py_func', None) is not None:
                 node.py_func.entry.doc = EncodedString(new_doc)