adopt SPDX license
According to https://docs.python.org/3/license.html, Python software and documentation are licensed under the PSF License Agreement.
Since PSF-2.0 is included in licenses package, License can be shared commonly.
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According to https://docs.python.org/3/license.html, Python software and documentation are licensed under the PSF License Agreement.
Since PSF-2.0 is included in licenses package, License can be shared commonly.