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python解释器的安装；python2与python3同时在环境变量中时的解决方案

ABO在安装python3.6和python2.7的解释器时遇到了一些问题，记录在这里

解释器下载地址https://www.python.org/downloads/,打开之后选择需要的版本并进行下载；
这里ABO同时下载了3.6和2.7两个版本；

3.6安装

如下图，双击安装程序

此时建议勾选Add Python 3.6 to PATH（将python3.6添加到环境变量；
默认的python解释器安装路径如上图中框起来的地方，如果想要自己定义的话，选择Customize installation；（ABO有强迫症，更改了安装路径）

更改了安装路径的继续向下看，默认安装路径为C盘的跳过该部分即可；

全部默认即可

更改安装路径，然后install

安装进程结束后，不用管disable path length limit的选项，close窗口，测试如下：

因为安装的过程中已经Add Python 3.6 to PATH，所以不需要额外设置环境变量

2.7安装

与python3.6的安装类似，打开安装程序，next到下图选择安装路径处（ABO再一次没有选择默认的路径）：

下一个窗口中，勾选最后一个将python2.7添加到环境变量的选项
next至安装结束。

环境变量之间的冲突

同时安装了python2.7与python3.6之后，遇到了这样一个问题：

由于python3.6和python2.7均运用了环境变量python，因此先安装的python3.6就覆盖了python2.7

那么如何使用python2.7呢？

首先当然可以输入python2.7完整的安装路径，如下图：
另外，简单的将python2.7与python3.6安装目录下的python.exe区分开即可；
- 如下图，将python2.7安装目录下的python.exe重命名为了python2.exe而python3.6目录下的python.exe不变。

再进行测试，此时已经可以很容易的分别python2.7与python3.6的解释器了

2017-2-16 19:12;59