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To use `jsonschema` instead, set the environment variable `NBFORMAT_VALIDATOR` to the value `jsonschema`.\n\n## Python Version Support\n\nThis library supported Python 2.7 and Python 3.5+ for `4.x.x` releases. With Python 2's end-of-life nbformat `5.x.x` supported Python 3 only. Support for Python 3.x versions will be dropped when they are officially sunset by the python organization.\n\n## Contributing\n\nRead [CONTRIBUTING.md](./CONTRIBUTING.md) for guidelines on how to setup a local development environment and make code changes back to nbformat.\n\n## About the Jupyter Development Team\n\nThe Jupyter Development Team is the set of all contributors to the Jupyter project.\nThis includes all of the Jupyter subprojects.\n\nThe core team that coordinates development on GitHub can be found here:\nhttps://github.com/jupyter/.\n\n## Our Copyright Policy\n\nJupyter uses a shared copyright model. Each contributor maintains copyright\nover their contributions to Jupyter. 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