错误解决：Cannot fetch index base URL https://pypi.python.org/simple/

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使用命令：python3 -m pip install ipykernel
报错：Cannot fetch index base URL https://pypi.python.org/simple/

解决方法：

python3 -m pip install ipykernel -i http://pypi.douban.com/simple/

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参考资料：

https://blog.csdn.net/m0_37690319/article/details/79945809