清华anaconda镜像园
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple
图片引用自：https://blog.csdn.net/wangpengfei163/article/details/89958171?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2allfirst_rank_v2~rank_v25-1-89958171.nonecase&utm_term=anaconda%E7%89%88%E6%9C%AC%E4%B8%8Epython%E5%85%B3%E7%B3%BB