如何从命令行在python 2.7到python 3之间切换？ [英] How to switch between python 2.7 to python 3 from command line?

问题描述

我试图找到最好的方式在两个python编译器之间切换2.7到3.3
如果我从cmd运行python，我会使用像

I'm trying to find the best way to switch between the two python compilers 2.7 to 3.3 If I run python from cmd, I would you use something like

python ex1.py

其中我从窗口环境变量设置python从我的计算机属性指向python 3.3或2.7一个或另一个。

where I set "python" from window environment variable from my computer properties to point to either python 3.3 or 2.7 one or another.

我想知道有一个简单的方法从两个cmd之间切换？

I am wondering there is an easy way to switch between the two from cmd line ?

推荐答案

对于Windows 7，我只是重命名 python.exe 将Python 3文件夹更改为 python3.exe 并将路径添加到环境变量中。使用它，我可以执行 python test_script.py ，脚本使用Python 2.7运行，当我执行 python3 test_script.py ，它运行Python 3中的脚本。

For Windows 7, I just rename the python.exe from the Python 3 folder to python3.exe and add the path into the environment variables. Using that, I can execute python test_script.py and the script runs with Python 2.7 and when I do python3 test_script.py, it runs the script in Python 3.

要将 Python 3 添加到环境变量，请按照下列步骤 -

To add Python 3 to the environment variables, follow these steps -

1. 右键点击我的电脑，然后转到属性。


2. 转到高级系统设置。


3. 单击环境变量并编辑 PATH 并将路径添加到您的Python 3安装目录。

1. Right Click on My Computer and go to Properties.
2. Go to Advanced System Settings.
3. Click on Environment Variables and edit PATH and add the path to your Python 3 installation directory.

例如，

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