add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# md5 from https://pypi.python.org/pypi/traitlets/json, sha256 locally computed
md5 3068663f2f38fd939a9eb3a500ccc154 traitlets-4.3.2.tar.gz
sha256 9c4bd2d267b7153df9152698efb1050a5d84982d3384a37b2c1f7723ba3e7835 traitlets-4.3.2.tar.gz