Windows下使Python2.x版本的解释器与3.x共存的方法
Python2 和 Python3 是不兼容的，如果碰到无法升级到 Python2 代码，或者同事中有坚守 Python2 阵营的情况，就要考虑 Python2 和 Python3 在系统中共存的情况。
Mac OS X 和 Linux 不必考虑这个情况。因为这些类 Unix 操作系统在安装 Python3 的时候，会将其直接映射为 Python3 。同时安装 Python2 和 Python3 并不会有什么冲突。
这里只讨论 Windows 下的情况， 下面是我常用的方法。
1. 创建 D:\Python 文件夹；
2. 将 Python 2.7 安装到 D:\Python27，将 Python 3.4 安装到 D:\Python34 ，安装的时候注意 不要 把 Python 加入到 PATH 环境变量；
3. 创建 D:\Python\py2.bat ，内容如下：
D:\Python\27\python.exe %*
4. 创建 D:\Python\py3.bat ，内容如下：
D:\Python\34\python.exe %*
5. 将 D:\Python 加入环境变量 PATH 。
这样处理之后，就可以直接在命令行中敲入
py3 yourpythonfile.py arg1 arg2
来调用 Python3 了，Python2 也一样。
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