Update ExprNodes.py

Cython/Compiler/ExprNodes.py

@@ -187,6 +187,8 @@ def infer_sequence_item_type(env, seq_node, index_node=None, seq_type=None):
             return item_types.pop()
     return None
 
+# Returns a block of code to translate the exception,
+# plus a boolean indicating whether to check for Python exceptions.
 def get_exception_handler(exception_value):
     if exception_value is None:
         return "__Pyx_CppExn2PyErr();", False