Windows10实现同时安装python3和python2双版本教程

「爱情、让人受尽委屈。」 2023-10-05 20:26 24阅读 0赞

**特别说明**：文是在`Windows64位`系统下进行的，32位系统请下载相应版本的安装包，安装方法类似。

### 下载python3和python2 ###

进入python官网：[https://www.python.org/][https_www.python.org]  
选择`Downloads ---> Windows`，点击进入就可以看到所有的python版本

> 本文以`python2.7.9`及`python3.8.5`为例，其他版本安装方式相同

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NjY0MjMx_size_16_color_FFFFFF_t_70]

> Python3.8.5，点击后面链接可直接下载：[https://www.python.org/ftp/python/3.8.5/python-3.8.5-amd64-webinstall.exe][https_www.python.org_ftp_python_3.8.5_python-3.8.5-amd64-webinstall.exe]  
> Python2.7.9，点击后面链接可直接下载：[https://www.python.org/ftp/python/2.7.9/python-2.7.9.amd64.msi][https_www.python.org_ftp_python_2.7.9_python-2.7.9.amd64.msi]

### 安装python3 ###

为了不出意外，我们选择先安装`python3`  
双击运行python3安装程序，选择自定义安装，记得勾选图中红框部分，勾选后会自动将环境变量添加到系统中  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NjY0MjMx_size_16_color_FFFFFF_t_70 1]  
点击`next`，默认全选即可  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NjY0MjMx_size_16_color_FFFFFF_t_70 2]  
自定义安装路径  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NjY0MjMx_size_16_color_FFFFFF_t_70 3]  
安装完成后点击`close`即可  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NjY0MjMx_size_16_color_FFFFFF_t_70 4]  
然后`Win+R`输入`cmd`打开小黑窗口，查看安装是否成功，出现如下结果则安装成功

#注意V为大写
    python -V

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NjY0MjMx_size_16_color_FFFFFF_t_70 5]

### 安装python2 ###

安装方式同python3，但是在出现以下窗口时不要慌，直接next就行，稍后会解决  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NjY0MjMx_size_16_color_FFFFFF_t_70 6]  
安装完成后点击`Finish`

> **特别说明：** 此时运行`cmd`命令后进入DOS命令提示框，输入`python`仍然显示python3版本，此时不要慌，解决办法下篇文章更新

[https_www.python.org]: https://www.python.org/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NjY0MjMx_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20210226172342925.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NjY0MjMx,size_16,color_FFFFFF,t_70
[https_www.python.org_ftp_python_3.8.5_python-3.8.5-amd64-webinstall.exe]: https://www.python.org/ftp/python/3.8.5/python-3.8.5-amd64-webinstall.exe
[https_www.python.org_ftp_python_2.7.9_python-2.7.9.amd64.msi]: https://www.python.org/ftp/python/2.7.9/python-2.7.9.amd64.msi
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