mac以前会自带2.7版本的python，现在会在安装命令行工具后默认安装3.9.6版本的python。 这里讨论的情况是mac本体已经带了3.9.6版本的python。命令行检查为：
mcd@maidanglaodeMacBook-Air ~ % where python3
/usr/bin/python3Homebrew官网为：https://brew.sh/ 可以使用官网里面的命令进行安装（需要翻墙环境），也可以使用官网里面推荐的pkg安装
这基本上是pkg安装后的问题，原因是环境变量没有设置好。
-
确定homebrew位置 在pkg安装的界面可以看到它会安装在哪个位置
-
编辑/etc/profile文件
sudo vim /etc/profile
按
i进入编辑模式，在文件最后写入以下内容export PATH="/opt/homebrew/bin:$PATH"按
esc退出编辑模式，输入:wq!保存文件并退出vim 执行source /etc/profile
安装python
brew install python3指定版本
brew install [email protected]brew安装完python的时候会有一系列文本：
Python is installed as
/opt/homebrew/bin/python3.10
Unversioned and major-versioned symlinks `python`, `python3`, `python-config`, `python3-config`, `pip`, `pip3`, etc. pointing to
`python3.10`, `python3.10-config`, `pip3.10` etc., respectively, are installed into
/opt/homebrew/opt/[email protected]/libexec/bin
You can install Python packages with
pip3.10 install <package>
They will install into the site-package directory
/opt/homebrew/lib/python3.10/site-packages
tkinter is no longer included with this formula, but it is available separately:
brew install [email protected]
If you do not need a specific version of Python, and always want Homebrew's `python3` in your PATH:
brew install python3
See: https://docs.brew.sh/Homebrew-and-Python这里说明了python3.10和pip3.10安装在了哪里，如果没有保存文本，可以通过命令where python3.10查询
-
编辑
~/.zshrc文件vim ~/.zshrc -
按
i键进入编辑模式，在文件最后添加内容export PATH="/opt/homebrew/bin:$PATH" alias python3='/opt/homebrew/bin/python3.10' alias pip3='/opt/homebrew/bin/pip3.10'
按
esc退出编辑模式，输入:wq!保存文件并退出vim 执行source ~/.zshrc