Window 中安装python多版本环境

由于python 3 已是目前稳定，且是将来版本版本。新学者可以直接从python3入手学习。但是目前还有很多企业级应用使用的是python 2，可能还得要维护。所以，我们在本地windows中可以安装python多版本，进行熟悉。

一：下载 python 3

官网地址：https://www.python.org

二：安装 python 3

安装时，勾选“Add Python 3.x to PATH” 或者安装后配置环境变量

三：配置

1.修改python.exe

将安装目录下的 C:Python35python.exe 改名为 python3.exe

2.修改 pip.exe

将python 3 中的 C:Python35Scriptspip.exe 删掉

3.更新 pip

C:WINDOWSSystem32>pip3
Fatal error in launcher: Unable to create process using '"'

如果出现上方错误提示，则重新更新python3 的pip 即可，命令如下

C:WINDOWSSystem32>python3 -m pip install -U pip
Collecting pip
  Downloading pip-8.1.2-py2.py3-none-any.whl (1.2MB)
    35% |███████████▏                    | 419kB 117kB/s eta 0:00:07
Successfully installed pip-8.1.2

四：检查安装情况

C:WINDOWSSystem32>python -V
Python 2.7.9

C:WINDOWSSystem32>python3 -V
Python 3.5.2

C:WINDOWSSystem32>pip -V
pip 1.5.6 from C:Python27libsite-packages (python 2.7)

C:WINDOWSSystem32>pip3 -V
pip 8.1.2 from c:python35libsite-packages (python 3.5)

C:WINDOWSSystem32>where python
C:Python27python.exe

C:WINDOWSSystem32>where python3
C:Python35python3.exe

 python -m pip install --upgrade pip

C:UsersAdministrator>pip3 --version
pip 1.5.6 from D:360YPVMpython2.7libsite-packages (python 2.7)

C:UsersAdministrator>python -m pip --version
pip 1.5.6 from D:360YPVMpython2.7libsite-packages (python 2.7)

C:UsersAdministrator>python -m pip install --upgrade pip
Downloading/unpacking pip from https://pypi.python.org/packages/b6/ac/7015eb97dc749283ffdec1c3a88ddb8ae03b8fad0f0e611408
f196358da3/pip-9.0.1-py2.py3-none-any.whl#md5=297dbd16ef53bcef0447d245815f5144
Installing collected packages: pip
  Found existing installation: pip 1.5.6
    Uninstalling pip:
      Successfully uninstalled pip
Successfully installed pip
Cleaning up...

C:UsersAdministrator>pip --version
pip 9.0.1 from D:360YPVMpython2.7libsite-packages (python 2.7)

C:UsersAdministrator>pip3 --version
pip 9.0.1 from d:360ypvmpython35libsite-packages (python 3.5)

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