You can check if Python is installed via Homebrew on your system using the command brew info.
Homebrew can also be used to install a Python version in addition to the system Python. Many people use Homebrew to install software packages on their MacOS. You might need newer or different versions of Python on your system. So obviously BigSur still relies on Python 2 which is acceptable for your macOS but maybe not for you as a developer. When you upgraded from Catalina to BigSur you realized that the system Python has not been upgraded from Python 2 to Python 3 for example. So python, python2 and python2.7 do not exist in the /usr/local/bin directory but in /usr/bin directory. The shell will lookup for a command in the paths defined in the PATH variable and start on the left side of the PATH. ~ % echo $PATH /usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin ~ % ~ % python -version Python 2.7.16 ~ % python2 -version Python 2.7.16 ~ % python2.7 -version Python 2.7.16 in the command without using the path like the /usr/bin/python works because the /usr/bin directory is configured in the shell PATH variable. So when you type one of these as a shell command in your shell terminal the binary in the /System/Library/Frameworks/amework/Versions/2.7/bin/python2.7 directory will be executed. The symlinks python, python2 and python2.7 in the /usr/bin directory each point to the same binary in the /System/Library/Frameworks/amework/Versions/2.7/bin/python2.7 directory. /System/Library/Frameworks/amework/Versions/2.7/bin/python2.7. /System/Library/Frameworks/amework/Versions/2.7/bin/python2.7 lrwxr-xr-x 1 root wheel 75 /usr/bin/python2.7 ->. /System/Library/Frameworks/amework/Versions/2.7/bin/python2.7 lrwxr-xr-x 1 root wheel 75 /usr/bin/python2 ->. ~ % ls -l /usr/bin/python* lrwxr-xr-x 1 root wheel 75 /usr/bin/python ->. In the /usr/bin directory you will find Python symlinks pointing to the Python binaries in the /System/Library/Frameworks/amework/Versions/2.7/bin directory. This means all files and symlinks in the /usr/bin directory are system owned which means managed by the system and not managed by the user. System Python is installed in the /usr/bin directory which is owned by root. This system Python should never be touched. Python 2 is required by the operating system and managed by macOS.
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