I have a mac (OSX) so I usually write the scripts in this program called TextWrangler, then I just select "run in terminal" and it runs it for me.
When I type
$> ln -s /usr/bin/python
it gives
ln: ./python: File exists
when I type
$ python --version
it gives
Python 2.7.15
:-(
When I type
$> ln -s /usr/bin/python
it gives
ln: ./python: File exists
when I type
$ python --version
it gives
Python 2.7.15
:-(