ERROR: Could not find a version that satisfies the requirement jupyter

pip3安装jupyter和d2l报错
解决:换国内镜像源

pip3 install --user  jupyter -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
pip3 install --user d2l -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com

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cmd输入jupyter notebook自动打开网页jupyter,cmd不要关

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