virtualenv --no-site-packages 和 pip 仍在寻找全局包? [英] virtualenv --no-site-packages and pip still finding global packages?

问题描述

我的印象是 virtualenv --no-site-packages 会创建一个完全独立和隔离的 Python 环境，但它似乎没有.

I was under the impression that virtualenv --no-site-packages would create a completely separate and isolated Python environment, but it doesn't seem to.

例如，我在全局安装了 python-django，但希望创建一个具有不同 Django 版本的 virtualenv.

For example, I have python-django installed globally, but wish to create a virtualenv with a different Django version.

$ virtualenv --no-site-packages foo       
New python executable in foo/bin/python
Installing setuptools............done.
$ pip -E foo install Django
Requirement already satisfied: Django in /usr/share/pyshared
Installing collected packages: Django
Successfully installed Django

据我所知，上面的 pip -E foo install 应该重新安装新版本的 Django.另外，如果我告诉 pip 冻结环境，我会得到很多包.我希望对于带有 --no-site-packages 的全新环境，这将是空白的?

From what I can tell, the pip -E foo install above is supposed to re-install a new version of Django. Also, if I tell pip to freeze the environment, I get a whole lot of packages. I would expect that for a fresh environment with --no-site-packages this would be blank?

$ pip -E foo freeze
4Suite-XML==1.0.2
BeautifulSoup==3.1.0.1
Brlapi==0.5.3
BzrTools==1.17.0
Django==1.1
... and so on ...

我是否误解了 --no-site-packages 应该如何工作?

Am I misunderstanding how --no-site-packages is supposed to work?

推荐答案

我遇到了这样的问题，直到我意识到(早在我发现 virtualenv 之前)，我已经在我的 .bashrc 文件中向 PYTHONPATH 添加目录.因为已经过去一年多了，我并没有立即想到这一点.

I had a problem like this, until I realized that (long before I had discovered virtualenv), I had gone adding directories to the PYTHONPATH in my .bashrc file. As it had been over a year beforehand, I didn't think of that straight away.

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