点子冻结为什么会列出"pkg-resources == 0.0.0"? [英] Why does pip freeze list "pkg-resources==0.0.0"?

问题描述

在具有virtualenv 15.0.1和Python 3.5.2(均与apt一起安装)的Ubuntu 16.04上，当我创建并激活新的Python虚拟环境时

On Ubuntu 16.04 with virtualenv 15.0.1 and Python 3.5.2 (both installed with apt) when I create and activate new Python virtual environment with

virtualenv .virtualenvs/wtf -p $(which python3) --no-site-packages
source .virtualenvs/wtf/bin/activate

我得到以下输出:

Already using interpreter /usr/bin/python3
Using base prefix '/usr'
New python executable in /home/das-g/.virtualenvs/wtf/bin/python3
Also creating executable in /home/das-g/.virtualenvs/wtf/bin/python
Installing setuptools, pkg_resources, pip, wheel...done.

实际上，pip freeze --all列出了这4个软件包:

Indeed pip freeze --all lists these 4 packages:

pip==8.1.2
pkg-resources==0.0.0
setuptools==25.2.0
wheel==0.29.0

但是，我希望pip freeze(没有--all)忽略这些隐式安装的软件包.它确实省略了其中的一些，但没有pkg-resources:

Though, I'd expect pip freeze (without --all) to omit these implicitly installed packages. It does omit some of them, but not pkg-resources:

pkg-resources==0.0.0

(与pip freeze --local相同)

这与帮助文本一致

$> pip freeze --help | grep '\--all'
  --all                       Do not skip these packages in the output: pip, setuptools, distribute, wheel

在pip freeze输出中具有pkg-resources的

似乎不是很有用，甚至可能有害. (我怀疑这就是为什么从 pip-tools 运行pip-sync会从虚拟环境中卸载pkg-resources，从而巧妙地破坏环境的原因为什么pip freeze列出pkg-resources而不是忽略它有充分的理由吗?据我所知，它没有在Ubuntu 14.04上列出(使用Python 3.4)

having pkg-resources in the pip freeze output doesn't seem very useful and might even be harmful. (I suspect it's why running pip-sync from pip-tools uninstalls pkg-resources from the virtual environment, subtly breaking the environment thereby.) Is there any good reason why pip freeze lists pkg-resources instead of omitting it, too? As far as I remember, it didn't list it on Ubuntu 14.04 (with Python 3.4).

推荐答案

根据 https://github.com/pypa /pip/issues/4022 ，这是由于Ubuntu为pip提供错误的元数据而导致的错误.因此，似乎没有任何合理的理由来进行这种行为.我向Ubuntu提交了一个后续错误. https://bugs.launchpad.net/ubuntu/+source/python-pip/+ bug/1635463

According to https://github.com/pypa/pip/issues/4022, this is a bug resulting from Ubuntu providing incorrect metadata to pip. So, no there does not seem to be a good reason for this behaviour. I filed a follow-up bug with Ubuntu. https://bugs.launchpad.net/ubuntu/+source/python-pip/+bug/1635463

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