pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
加参数pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pandas
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
加参数pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pandas
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