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Python

"""Convert notebook to the v1 format."""
# -----------------------------------------------------------------------------
# Copyright (C) 2008-2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file LICENSE, distributed as part of this software.
# -----------------------------------------------------------------------------
# -----------------------------------------------------------------------------
# Code
# -----------------------------------------------------------------------------
from __future__ import annotations
def upgrade(nb, orig_version=None):
"""Upgrade a notebook."""
msg = "Cannot convert to v1 notebook format"
raise ValueError(msg)