windows下多版本python安装

python下载地址
https://www.python.org/downloads/windows/
下载并安装对应版本

python27

python36

配置环境变量

PATH中添加D:\Python27;D:\Python27\Scripts;D:\Python36;D:\Python36\Scripts

修改D:\Python27目录下的python.exe和pythonw.exe

改名为:python2.exe和pythonw2.exe

在cmd中进行测试,显示结果如下:

C:\Users\Administrator>python2

Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 27 2016, 15:19:22) [MSC v.1500 32 bit (Intel)] 

on win32

Type "help", "copyright", "credits" or "license" for more information.

>>> quit()

C:\Users\Administrator>python

Python 3.6.0b2 (v3.6.0b2:b9fadc7d1c3f, Oct 10 2016, 20:36:51) [MSC v.1900 32 bit (Intel)] 

on win32

Type "help", "copyright", "credits" or "license" for more information.

python2.7版本安装科学栈

#查看

python2 -m pip list

#更新pip

python2 -p pip install --upgrade pip

#安装numpy

python2 -m pip install numpy

python36安装科学栈

#查看

python -m pip list

#更新pip

python -p pip install --upgrade pip

#安装numpy

python -m pip install numpy

也可以直接下载文件,解压到lib目录下

科学栈镜像网址 
http://www.lfd.uci.edu/~gohlke/pythonlibs/