我有Python 3在macOS Catalina 10.15.3上使用brew：

brew uninstall python3
brew list | grep python
python@2

字符串
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

型
这很有趣，但在错误时，它显示了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.

型
它与Xcode有关。
如何使用brew删除python 3并重新安装python？

更新：

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

型