python virtualenv-优快云博客

本文链接：https://blog.youkuaiyun.com/zimu312500/article/details/80163951

本文详细介绍如何使用Python 2.7及以上版本创建虚拟环境，并通过pip安装所需依赖。此外，还介绍了如何升级pip以及在使用HTTP源安装软件包时如何解决安全警告问题。

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#选用python2.7及以上
pip install virtualenvvirtualenv --no-site-packages venv
source venv/bin/activate
pip install　-r requirement.txt

#pip升级

1、查看pip的版本号

pip --version

2、升级方法

On Linux or OS X:

pip install -U pip

On Windows:

python -m pip install -U pip

#设置证书安全

pip升级到7.0以后，在使用http镜像进行包安装及升级的时候往往会有如下提示：

Collecting beautifulsoup4
The repository located at mirrors.aliyun.com is not a trusted or secure host and is being ignored. If this repository is available via HTTPS it is recommended to use HTTPS instead, otherwise you may silence this warning and allow it anyways with ‘–trusted-host mirrors.aliyun.com’.
Could not find a version that satisfies the requirement beautifulsoup4 (from versions: )
No matching distribution found for beautifulsoup4

解决办法如下：

1.安装时加入–trusted-host mirrors.aliyun.com参数：