You should consider upgrading via the 'python -m pip install --upgrade pip' command.

• 问题描述
• 解决办法

问题描述

使用conda创建虚拟环境后，安装其他的包出现如下问题：

Could not fetch URL https://pypi.mirrors.ustc.edu.cn/simple/pip/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:748) - skipping
Requirement already up-to-date: pip in d:\programdata\anaconda3\envs\pyqt5\lib\site-packages
You are using pip version 9.0.1, however version 22.0.4 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

然后按照提示，输入python -m pip install --upgrade pip命令仍然出现报错

(PyQt5) C:\Users\tanhui>python -m pip install --upgrade pip
Could not fetch URL https://pypi.mirrors.ustc.edu.cn/simple/pip/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:748) - skipping
Requirement already up-to-date: pip in d:\programdata\anaconda3\envs\pyqt5\lib\site-packages
You are using pip version 9.0.1, however version 22.0.4 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

解决办法

输入指令python -m pip install --upgrade pip -i http://pypi.douban/simple --trusted-host pypi.douban。

(PyQt5) C:\Users\tanhui>python -m pip install --upgrade pip  -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
Looking in indexes: http://pypi.douban.com/simple
Requirement already satisfied: pip in d:\programdata\anaconda3\envs\pyqt5\lib\site-packages (21.3.1)

说明

-i http://pypi.douban.com/simple  #指定镜像源
--trusted-host pypi.douban.com    #信任该镜像源网络

另外如果按照其他包出现网络URL,可以按照如下代码修改

pip install package-name -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

附上其他镜像源，按需求修改即可

（1）http://pypi.mirrors.ustc.edu.cn/simple/ 中国科学技术大学
（2）https://pypi.mirrors.ustc.edu.cn/simple/ 中国科技大学
（3）http://pypi.douban.com/simple/ 豆瓣
（4）https://pypi.tuna.tsinghua.edu.cn/simple/ 清华大学
（5）http://mirrors.aliyun.com/pypi/simple/ 阿里云