Install Python 3 to /usr/bin/ on macOS

Question

I installed python2.x and python3.x using homebrew and the executable python paths are listed below:

$ which python
/Library/Frameworks/Python.framework/Versions/2.7/bin/python

$ which python3
/Library/Frameworks/Python.framework/Versions/3.5/bin/python3

It's quite too long and not so clean to write a shebang in a python code to make it runnable on Terminal:

#!/Library/Frameworks/Python.framework/Versions/2.7/bin/python OR
#!/Library/Frameworks/Python.framework/Versions/3.5/bin/python3

I prefer

#!/usr/bin/python OR
#!/usr/bin/python3

My issue here is, how can I correcly move or reinstall python on macOS to /usr/bin such as
/usr/bin/python OR /usr/bin/python3

Instead of
/Library/Frameworks/Python.framework/Versions/2.7/bin/python /Library/Frameworks/Python.framework/Versions/3.5/bin/python3

Answer 1

This is NOT possible on Mac OS X El Capitan anymore as from then on System Integrity Protection prevents that. More info in Cannot create a symlink inside of /usr/bin even as sudo

Answer 2

Create a symbolic link in /usr/bin/

Open terminal and do:

$ sudo ln /Library/Frameworks/Python.framework/Versions/2.7/bin/python /usr/bin/python
$ sudo ln /Library/Frameworks/Python.framework/Versions/3.5/bin/python3 /usr/bin/python3

You can now do what you wanted to do.

Edit: Unfortunately as you can read from the other answers, this solution no longer works on MacOS >= El Capitan due to System Integrity Protection. (See here)

A possible alternative is to use the folder /usr/local/bin that should be accessible.