在 MacOs 上卸载 python3

Question

我已经在 macOS Catalina 10.15.3 上使用 brew 卸载了 python3：

brew uninstall python3

brew list | grep python
python@2

但它仍然存在：

which python3
/usr/bin/python3

python3 -V
Python 3.7.3

/usr/bin/python3 -V
Python 3.7.3

ls -ltah /usr/bin/ | grep python

-rwxr-xr-x     1 root   wheel    31K Jan 23 16:58 python3
lrwxr-xr-x     1 root   wheel    75B Dec 16 06:20 python2.7 -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7
lrwxr-xr-x     1 root   wheel    82B Dec 16 06:20 python-config -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7-config
lrwxr-xr-x     1 root   wheel    76B Dec 16 06:20 pythonw2.7 -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/pythonw2.7
lrwxr-xr-x     1 root   wheel    82B Dec 16 06:20 python2.7-config -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7-config
lrwxr-xr-x     1 root   wheel    76B Dec 16 06:20 pythonw -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/pythonw2.7
lrwxr-xr-x     1 root   wheel    75B Dec 16 06:20 python2 -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7
lrwxr-xr-x     1 root   wheel    75B Dec 16 06:20 python -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7

这很有趣，但出错时它显示 python 的不同位置：

python3 -bla

Unknown option: -l
usage: /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.7/Resources/Python.app/Contents/MacOS/Python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Try `python -h' for more information.

似乎它与Xcode有关。

如何删除这个版本的python3并使用brew重新安装python？

更新：

sudo rm -f /usr/bin/python3
rm: /usr/bin/python3: Operation not permitted

Answer 1

Catalina 默认安装了 python3**。您无法删除它，因为/usr/bin它位于系统的只读卷上。

如果你将你的新 python 安装到你bin之前的文件夹/usr/bin中$PATH，那么它应该优先。

** （好吧，第一次运行它时，您必须安装 Xcode 命令行工具才能使其工作。但该文件本身是系统安装。）