我在 Mac 上正确安装 Python 时遇到困难（全新安装，我将 PC 擦干净）。我先安装
"xcode-select --install"在输入以下命令时：
which python3
输出如下：
gaurangsmacbookpro@Gaurangs-New-MacBook-Pro ~ % which python
/usr/bin/python
gaurangsmacbookpro@Gaurangs-New-MacBook-Pro ~ % which python3
/usr/bin/python3
运行以下命令后，我在此站点上关注了一个博客： https://www.pyimagesearch.com/2016/12/05/macos-install-opencv-3-and-python-3-5/
brew install eigen tbb
Home brew 安装了 python 3.9 依赖项，所以当我输入以下命令时没有：
brew list python3
我得到以下输出：
gaurangsmacbookpro@Gaurangs-New-MacBook-Pro ~ % brew list python3
/usr/local/Cellar/python@3.9/3.9.1_8/bin/2to3
/usr/local/Cellar/python@3.9/3.9.1_8/bin/2to3-3.9
/usr/local/Cellar/python@3.9/3.9.1_8/bin/easy_install-3.9
/usr/local/Cellar/python@3.9/3.9.1_8/bin/idle3
/usr/local/Cellar/python@3.9/3.9.1_8/bin/idle3.9
/usr/local/Cellar/python@3.9/3.9.1_8/bin/pip3
/usr/local/Cellar/python@3.9/3.9.1_8/bin/pip3.9
/usr/local/Cellar/python@3.9/3.9.1_8/bin/pydoc3
/usr/local/Cellar/python@3.9/3.9.1_8/bin/pydoc3.9
/usr/local/Cellar/python@3.9/3.9.1_8/bin/python3
/usr/local/Cellar/python@3.9/3.9.1_8/bin/python3-config
/usr/local/Cellar/python@3.9/3.9.1_8/bin/python3.9
/usr/local/Cellar/python@3.9/3.9.1_8/bin/python3.9-config
/usr/local/Cellar/python@3.9/3.9.1_8/bin/wheel3
/usr/local/Cellar/python@3.9/3.9.1_8/Frameworks/Python.framework/ (3019 files)
/usr/local/Cellar/python@3.9/3.9.1_8/IDLE 3.app/Contents/ (8 files)
/usr/local/Cellar/python@3.9/3.9.1_8/lib/pkgconfig/ (4 files)
/usr/local/Cellar/python@3.9/3.9.1_8/libexec/bin/ (7 files)
/usr/local/Cellar/python@3.9/3.9.1_8/libexec/pip/ (480 files)
/usr/local/Cellar/python@3.9/3.9.1_8/libexec/setuptools/ (334 files)
/usr/local/Cellar/python@3.9/3.9.1_8/libexec/wheel/ (44 files)
/usr/local/Cellar/python@3.9/3.9.1_8/Python Launcher 3.app/Contents/ (16 files)
/usr/local/Cellar/python@3.9/3.9.1_8/share/man/ (2 files)
我的~./bash_profile文件内容如下：
# Add Homebrew's executable directory to the front of the PATH
export PATH=/usr/local/bin:$PATH
export PATH="/usr/local/sbin:$PATH"
export PATH="/usr/local/opt/python@3.8/bin:$PATH"
我做错了什么？我只想全新安装 Python 3.8 而不是 3.9，因为 3.9 尚不支持 TF Lite。有人可以帮我解决这个烂摊子吗？我将不胜感激！