An easy way to add python environment variables

If the add Python.exe to Path is not selected when installing
Causes the Python prompt to be executed at the command prompt ' Python ' is not an internal or external command, nor is it a running program or batch file.
There are two ways to do this:
Method One: Use the cmd command to add the PATH environment variable

              在cmd下输入： path=%path%;D:\Python27  接着按"Enter"回车键。                 其中: D:\Python27  是Python的安装目录。

Method Two: Add the Python directory to the environment variable

              (1) 右键点击"计算机"，然后点击"属性"              (2) 然后点击"高级系统设置"              (3) 选择"系统变量"窗口下面的"Path",双击即可！              (4) 然后在"Path"行，添加python安装路径即可(我的D:\Python27)。 ps：记住，路径直接用分号"；"隔开！

An easy way to add python environment variables