新创建的 Python 虚拟环境中的默认库 [英] Default libraries in freshly created Python virtual environment

问题描述

我使用 python virtualenv 工具创建了一个新的虚拟环境.

I created a new virtual environment using the python virtualenv tool.

virtualenv venv

然后我激活了虚拟环境

source venv/bin/activate

然后我做了一个pip freeze，这就是我得到的:

Then I did a pip freeze and this is what I got:

(venv)$ pip freeze
Flask==0.10.1
Werkzeug==0.9.6
itsdangerous==0.24
lxml==3.4.0
numpy==1.9.1
pdir==0.2.2
virtualenv==1.11.6
wsgiref==0.1.2

当我什至没有在虚拟环境中明确安装任何东西时，我想知道怎么安装了这么多库.

I am wondering how so many libraries got installed when I did not even install anything in the virtual environment explicitly.

UPDATE 1:当一些答案建议时，我在第 1 步中也使用了 virtualenv --no-site-packages 来创建一个新的 venv 和同样的问题仍然存在.好像使用这个参数根本没有效果.

UPDATE 1: When some of the answers suggested, I used virtualenv --no-site-packages as well in Step 1, to create a fresh venv and the same problem persisted. As if using the argument had no effect at all.

更新 2:我能够解决问题并在下面发布了我的经验.正如评论中指出的那样；这是一个相关的问题；链接，帮助我解决了问题.

UPDATE 2: I was able to solve the problem and have posted my experience below. As pointed in the comments; here is a related question; link, that helped me solve the problem.

推荐答案

那些是已经在您的系统上全局安装的库.

Those are the libraries that are already installed globally on your system.

最佳实践是使用 --no-site-packages 创建 virtualenv 时的选项，以避免这个确切的问题.

Best practice is to use the --no-site-packages option when creating the virtualenv in order to avoid this exact issue.

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