tcn: Fix undefined 'v' in Python 3
tcn: Fix undefined 'v' in Python 3

tombstone/models,jiaphuan/models,tombstone/models,derekjchow/models,alexgorban/models,tombstone/models,jiaphuan/models,jiaphuan/models,jiaphuan/models,cshallue/models,tombstone/models,derekjchow/models,tombstone/models,tombstone/models,cshallue/models,alexgorban/models,alexgorban/models,alexgorban/models,cshallue/models,jiaphuan/models,derekjchow/models,cshallue/models,derekjchow/models,cshallue/models,jiaphuan/models,derekjchow/models,alexgorban/models