为什么 virtualenv 环境包含 argparse、distribute 和 wsgiref? [英] Why does a virtualenv environment contain argparse, distribute and wsgiref?

问题描述

我使用 virtualenv 1.7.1.2 版和 python 2.7.3 来创建虚拟 python 环境.但是当我创建这样的环境并激活它时，我可以看到安装了以下包(使用pip freeze):

I am using virtualenv version 1.7.1.2 with python 2.7.3 to create virtual python ennvironments. But when I create such an environment and activate it, I can see the following packages are installed (using pip freeze):

argparse==1.2.1
distribute==0.6.24
wsgiref==0.1.2

这是为什么?这是什么意思?

Why is that? What does that mean?

推荐答案

这些是标准包，并且将始终遵循该版本的 Python 和 Virtualenv.

These are the standard packages, and will always follow with that version of Python and Virtualenv.

• distribute 是不言自明的.pip 是必需的.Distribute 还包含 setuptools，但在包内，因此无法被 pip freeze 识别.有关实际的更多信息，请查看您的env/lib/python2.7/site-packages/distribute-0.6.31-py2.7.egg.

• distribute is pretty self-explainatory. It's necessary for pip. Distribute also contains setuptools, but inside the package so not recognized with pip freeze. For more information about what it actually does check out your env/lib/python2.7/site-packages/distribute-0.6.31-py2.7.egg.

wsgiref 实际上是标准库的一部分，但不被认可.上面有一个错误报告，它在 Python 3.3+ 中得到了修复.在 为什么 pip freeze 在使用 --no-site-packages 创建的新 virtualenv 中报告一些包?

wsgiref is actually a part of the standard library, but isn't recognized as so. There's a bug report on it, and it's fixed in Python 3.3+. Read more about it in Why does pip freeze report some packages in a fresh virtualenv created with --no-site-packages?

我不知道为什么 argparse 在那里，但我的猜测是因为它是一个依赖项或类似 wsgiref 的东西.在 Python 中查找包依赖项 可能有点麻烦/痛苦，尤其是如果它已经安装在您的 virtualenv 中.

I can't find out why argparse is there though, but my guess is because it's a dependency or something like wsgiref. Finding package dependencies in Python can be a bit hacky/painful though, especially if it's already installed in your virtualenv.

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