重复的virtualenv

问题描述

如果我想要重复，那么我在virtualenv中有一个现有的环境，包含很多软件包，而且还有一个旧的Django版本。 >这个环境，

所以我可以有另一个环境，我可以在其中安装一个较新的Django版本，
但是保留已经在其他环境中的所有软件包？

解决方案

最简单的方法是使用pip生成需求文件。需求文件基本上是一个文件，其中包含您要安装的所有python软件包的列表（或者已经安装了由pip生成的文件的情况），以及它们的版本。

要生成要求文件，请转到原始的virtualenv，然后运行：

  pip freeze> require.txt 
  

这将为您生成 requires.txt 文件。如果您在自己喜欢的文本编辑器中打开该文件，您将看到如下：

  Django == 1.3 
 Fabric == 1.0.1 
 etc ... 
  

现在，编辑行说 Django == xx 说 Django == 1.3 （或你想要安装在你的新virtualenv中的任何版本）

最后，激活您的新 virtualenv，然后运行：

  pip install -r requirements.txt 
  

点数将自动下载并安装您的 requirements.txt 文件中列出的所有python模块，以您指定的任何版本！

I have an existing environment in virtualenv, with a lot of packages, but an old Django version.

What if I want to duplicate this environment,
so I can have another environment in which I can install a newer Django version,
but keeping all packages that are already in the other environment?

解决方案

The easiest way is to use pip to generate a requirements file. A requirements file is basically a file that contains a list of all the python packages you want to install (or have already installed in case of file generated by pip), and what versions they're at.

To generate a requirements file, go into your original virtualenv, and run:

pip freeze > requirements.txt

This will generate the requirements.txt file for you. If you open that file up in your favorite text editor, you'll see something like:

Django==1.3
Fabric==1.0.1
etc...

Now, edit the line that says Django==x.x to say Django==1.3 (or whatever version you want to install in your new virtualenv).

Lastly, activate your new virtualenv, and run:

pip install -r requirements.txt

And pip will automatically download and install all the python modules listed in your requirements.txt file, at whatever versions you specified!

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