如何在Windows中同时安装Python 2.x和Python 3.x [英] How to install both Python 2.x and Python 3.x in Windows

问题描述

我在Windows 7上使用Python 3.x进行大部分编程，但是现在我需要使用Python Imaging Library(PIL)，ImageMagick和wxPython，所有这些都需要Python 2.x.

I do most of my programming in Python 3.x on Windows 7, but now I need to use the Python Imaging Library (PIL), ImageMagick, and wxPython, all of which require Python 2.x.

我可以在Windows 7中同时安装Python 2.x和Python 3.x吗?当我运行脚本时，如何选择"应该运行哪个版本的Python?前面提到的程序能否处理一次安装的多个版本的Python?我已经搜索了好几个小时，却无济于事.

Can I have both Python 2.x and Python 3.x installed in Windows 7? When I run a script, how would I "choose" which version of Python should run it? Will the aforementioned programs be able to handle multiple versions of Python installed at once? I have searched for hours and hours for how to do this to no avail.

谢谢.

推荐答案

我发现执行此操作的正式方法如下:

I found that the formal way to do this is as follows:

只需在Windows 7上安装两个(或更多，使用其安装程序)Python版本(对我而言，使用3.3和2.7).

Just install two (or more, using their installers) versions of Python on Windows 7 (for me work with 3.3 and 2.7).

按照下面的说明，根据您的需要更改参数.

Follow the instuctions below, changing the parameters for your needs.

创建以下环境变量(默认为双击):

Create the following environment variable (to default on double click):

Name:  PY_PYTHON
Value: 3

要在特定的解释器中启动脚本，请添加以下shebang(脚本开始):

To launch a script in a particular interpreter, add the following shebang (beginning of script):

#! python2

要使用特定的解释器执行脚本，请使用以下提示命令:

To execute a script using a specific interpreter, use the following prompt command:

> py -2 MyScript.py

要启动特定的解释器，请执行以下操作:

To launch a specific interpreter:

> py -2

要启动默认解释器(由PY_PYTHON变量定义):

To launch the default interpreter (defined by the PY_PYTHON variable):

> py

资源

文档:在Windows上使用Python

PEP 397 -Windows的Python启动器

PEP 397 - Python launcher for Windows

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