python3 pip3 安装包报错 Could not find a version that satisfies the requirement 解决方法

现象：

[root@e45b79f0cd70 Python-3.9.0]# pip3 install pycryptodome
Looking in indexes: https://pypi.douban.com/simple/
ERROR: Could not find a version that satisfies the requirement pycryptodome (from versions: none)
ERROR: No matching distribution found for pycryptodome
[root@e45b79f0cd70 Python-3.9.0]#

原因：pip3 镜像源问题更换镜像源，当前使用的镜像源 https://pypi.douban.com/simple/ 更换为 https://pypi.mirrors.ustc.edu.cn/simple/

解决方法：

mkdir -p /$HOME/.pip/ && echo -e "[global]\nindex-url = https://pypi.mirrors.ustc.edu.cn/simple/\n" > /$HOME/.pip/pip.conf && pip3 install pycryptodome

执行输出如下：

[root@e45b79f0cd70 Python-3.9.0]# mkdir -p /$HOME/.pip/ && echo -e "[global]\nindex-url = https://pypi.mirrors.ustc.edu.cn/simple/\n" > /$HOME/.pip/pip.conf && pip3 install pycryptodome
Looking in indexes: https://pypi.mirrors.ustc.edu.cn/simple/
Collecting pycryptodomeDownloading https://mirrors.bfsu.edu.cn/pypi/web/packages/ad/16/9627ab0493894a11c68e46000dbcc82f578c8ff06bc2980dcd016aea9bd3/pycryptodome-3.10.1-cp35-abi3-manylinux2010_x86_64.whl (1.9 MB)|████████████████████████████████| 1.9 MB 1.4 MB/s
Installing collected packages: pycryptodome
Successfully installed pycryptodome-3.10.1
WARNING: You are using pip version 20.2.3; however, version 21.1.1 is available.
You should consider upgrading via the '/opt/python3/bin/python3.9 -m pip install --upgrade pip' command.
[root@e45b79f0cd70 Python-3.9.0]#

pip3 镜像源参考：《python3 pip 更换国内 pypi 镜像源》https://blog.csdn.net/whatday/article/details/105431658

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